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Anvo Morgane Paul Magouana, Kouadio Kouakou Eugène, Kouassi N’Gouan Cyrille, Ouattara Siaka, Assemien-Diarrassouba Olga
International Journal of Fisheries and Aquatic Studies, Volume 9, pp 111-115; https://doi.org/10.22271/fish.2021.v9.i5b.2574

Abstract:
The present
study
was carried out to
study
the preferred prey in the larval and post-larval stages of Heterobranchus lonsifilis.Two hundred and forty larvae and fry of H. longifilis aged 2 to 23 days were stored in aquariums of 8 liters, fasted for 24 hours at the end of which they were fed to satiety with freshly collected zooplankton from fishponds. The day after feeding, the fish were euthanized and stored for stomach contents examination. The results showed that the zooplanktonic population density of the station ponds was 1356.73 individuals / L. This stand is composed of Cladocerans (455.85 individuals /l), nauplii (289.11 individuals / l), Rotifers (255.47 individuals / l), Copepodites (182.21 individuals / l) and Copepods adults (174.07 individuals /l). Furthermore, examination of stomach contents showed that adult Copepods were the most frequent and abundant prey category in stomach contents in terms of frequency of occurrence (66.7%) and numerical percentage (48.25%). In addition, these preys (adult copepods) constituted the preferred zooplankton prey in larvae and post-larvae of H. longifilis with an electivity index (E) equal to +0.5. Apart from the first size classes in which no prey has been observed in the stomach contents, the food preferences of H. longifilis larvae and fry do not vary with the size of the individuals. This
study
showed that adult copepods were the preferred zooplankton prey of H. longifilis larvae and fry.
Wadjé Jérôme N’Glouan, Jean Noel Yapi, Vincent Kadjo, Dofara Soro
International Journal of Fisheries and Aquatic Studies, Volume 9, pp 120-126; https://doi.org/10.22271/fish.2021.v9.i6b.2594

Abstract:
This
study
on growth, exploitation and mortality parameters of the mangrove oyster in the Grand-Lahou Lagoon was conducted from February 2019 to January 2020. Thus, a monthly sampling of 60 oysters coupled with water temperature measurement was carried out. Parameters were determined from the 20 mm size frequencies and integrated into the FiSAT I I software. Oysters from the Grand-Lahou lagoon have an asymptotic length of 142 mm, a growth coefficient (K) of 0.85 year-1, and a growth performance index of 2.234. Total mortality, natural mortality and fishing mortality are 2.26 year-1, 2.01 year-1and 0.25 year-1, respectively. Survival rate is 0.104 year-1, the exploitation rate (E) 0.11 and longevity (tmax) recorded is 3.53 year-1. Oyster recruitment is continuous throughout the year with two peaks, the largest in April and the lowest in October. Results from this
study
could contribute to the sustainable exploitation of this
aquatic
resource.
Bhaba Amatya
International Journal of Fisheries and Aquatic Studies, Volume 9, pp 30-37; https://doi.org/10.22271/fish.2021.v9.i6a.2583

Abstract:
The present
study
conducted non-parametric test on 22 distance characters of 42 samples of three-month-old Labeo rohita from a fish pond in Chitwan district, Nepal. ImageJ software was used to create landmark on the fish samples and established 22 distance characters along the dorso-ventral and antero-posterior body axes. Univariate and multivariate data analysis was used with PAST software. All the 22 distance characters were positively correlated with correlation coefficient greater than zero. Shapiro-Wilk test calculated p-value less than 0.05 for two distance characters. There was high variation in the means and medians of the data based on Levene’s test and Kruskal Wallis test. Tukey's pairwise test and Dunn’s post hoc test analyzed medians of the data for the significant relationship among the distance characters. Multivariate analysis with Principal Components Analysis (PC1 and PC2) of the 22 distance characters calculated the total Eigenvalue of 19.18944 and 87.2247% of variance under correlation matrix and Bootstrap N: 100. The fish samples varied in external morphology mainly in the body depth shape in dorso-ventral axis which is supposed to be the effect of culture conditions, food and mode of feeding.
Mohammad Ashaf-Ud-Doulah, Shariful Islam, Nafia Binte Ryhan, Shaheed Nasrullah Al Mamun, Salmon Hasan Biplob, Sunny Khan Majlish, Kazi Atiah Taiyebi
International Journal of Fisheries and Aquatic Studies, Volume 9, pp 96-102; https://doi.org/10.22271/fish.2021.v9.i6b.2589

Abstract:
Field experiments demonstrated that rice-fish farming indeed increased the productivity of rice field and help to achieve ecological, economical, and social benefits. An experiment was accompanied in the rice field plots to ascertain the felicitous fertilization effects on the growth performance of Nile Tilapia (Oreochromis niloticus) and Shing (Heteropneustes fossilis) cultured in the rice fish farming system. Each treatment of fish species cultured with different doses of fertilizer such as T1 control: without any fertilization; T2 with 10 kg/decimal compost and T3 with 100% recommended fertilizer: Urea 100g, TSP 100g, MOP 50g, MOK100g/decimal respectively for fish culture. Current
study
showed a direct relationship between nutrient supplies and yielding of rice; increasing nutrient supply highlighting an increase of yielding fish. These indicated significantly greater fish yield at treatment T3 followed by treatment T2 and T1 in Shing with rice culture. Concerning Tilapia with rice culture, the same occurrence was observed. The gross production of Tilapia were found 5.04 ± 2.66, 8.65 ± 2.42 and 12.02 ± 1.45 kg/decimal in T1, T2 and T3, respectively and gross production of Shing were found 3.06± 1.76, 6.17 ± 1.84 and 8.83 ± 2.88 kg/decimal in T1, T2 and T3, respectively. During the experimental period the ranges of water temperature were (27.26 to 31.22 °C), dissolved oxygen (5.66 to 7.20 mg/L), pH (7.25 to 7.65 mg/L), total alkalinity (148.00 to 176.00 mg/L), free CO2 were (1.40 to 3.00) mg/L and found within the productive limit and more or less similar in all the plots under the T1, T2 and T3. The outcome in T3 provided the maximum yields amongst all treatments, followed by treatments T2 and T1 representing that the fertilizer is the furthermost suitable nutrient input regime aimed at the rice- fish integrated culture scheme. The results of the
study
revealed that polyculture of tilapia and Shing could be practiced in rice field.
Debabrata Das, Aranya Das, Prakriti Das, Santa Ana Das
International Journal of Fisheries and Aquatic Studies, Volume 9, pp 132-135; https://doi.org/10.22271/fish.2021.v9.i6b.2596

Abstract:
Here a simple and hi-tech applications is delivered with nano-biotechnological applications. Nano-biotechnology is the branch of biotechnology that deals with making structures that are ranged between 0- 500 nanometres of dimension. Molecular diameter of Arsenic and its compounds usually falls within this range and appropriately porous Phytoplankton cells can accumulate this enzymes inhibition bio-molecules. As we all know that Phytoplankton is the base of several
aquatic
food webs. Phytoplankton, also known as microalgae, are similar to terrestrial plants in that contain chlorophyll and require sunlight in order to live and grow can be provided to Hydroponic mediums as energy supplements. Mere sieving of arsenic compounds by phytoplankton and providing safety hydroponic foods. From both the biological and the toxicological points of view, arsenic compounds can be classified into three major groups: inorganic arsenic compounds; organic arsenic compounds; and arsine gas and all these can be sieved with plankton populations of small and medium in sizes. Nanotechnology and nano-biotechnology with Plankton population are used in recent days for mankind. Arsenic or its compounds can be termed as nano-particles having environmental hazards to all biological cells, tissue, organs. As per molecular dimensions arsenic and arsenic compounds can be sieved by certain plankton populations. Small algae and medium algae can sieve arsenic or its compounds through their appropriate porous cells and accumulate within and can make the
aquatic
medium free from arsenic and which can be used for hydroponic culture medium and can produce Arsenic free fruit and vegetables.
R Kapuri, Ak Sinha, P De, R Roy, S Bhakat
International Journal of Fisheries and Aquatic Studies, Volume 9, pp 187-195; https://doi.org/10.22271/fish.2021.v9.i6c.2600

Abstract:
Nandus banshlaii, sp. nov. described from the Banshlai River of West Bengal. This species is distinguished from all its congeners in having a golden brown body in live and a combination of characters like longest head and snout length (44.28% SL and 35.58% HL respectively) and from its two Indian congeners in containing largest eye diameter (22.22% HL), longest pre-dorsal length (47.16% SL), shortest pectoral fin length (14.60% SL) and smallest dorsal fin base length (45.53% SL).Like all three congeners of Ganga-Brahmaputra-Meghna river basin of Gangetic delta it possess a dark spot on caudal peduncle. To differentiate the present species from other two Indian congeners of Nandus, N. nandus and N. andrewi, PCA and heatmap is performed and a key of all three species is also provided.
Mohd. Adip Setiawan, Neviaty P Zamani, Dietriech G Bengen, Syofyan Roni
International Journal of Fisheries and Aquatic Studies, Volume 9, pp 59-66; https://doi.org/10.22271/fish.2021.v9.i6a.2587

Abstract:
Reef fish are one of the biotas that live in coral reef ecosystems, and their lives depend on the condition of coral reefs. Reef fish communities have a close relationship with coral reefs as their habitat. Collecting data on reef fish and coral growth forms using the underwater visual census (UVS) method and methods point intercept transect (PIT). The results of the identification of coral growth forms found 10 growth forms. The most abundant group of fish in the core zone waters of the Anambas Islands was the omnivorous group of fish found as many as 14,924 ind/250m2. The uniformity index value is obtained by the criteria for a stable uniformity index. The cluster analysis results showed that the similarity index of 43% was found in three groups of entities. The correspondence analysis results found three groupings of reef fish based on their association with coral growth forms.
Rs Kulkarni
International Journal of Fisheries and Aquatic Studies, Volume 9, pp 104-107; https://doi.org/10.22271/fish.2021.v9.i5b.2572

Abstract:
The influence of water quality on blood haematological parameters was investigated during breeding period (spawning) in the fresh water fish, Notopterus notopterus. This fish is available in large numbers in all the three
aquatic
bodies, two rivers (Bheema and Kagina rivers) and one small streem (Saradagi Nala). Temperature, oxygen and pH are important environmental factors considered for the present
study
and these are found to ensure the fish to survive, its distribution and normal reproductive functioning of the fish in an
aquatic
body. The reproductive activity was assessed based on gradual changes in the gonadosamatic index (GSI) which increases on approaching breeding period during June- July and spawning occurs in August by the onset of rains. The change in the blood parameters such as haematocrite (Hct), haemoglobin (Hb) concentration and RBC count was observed. The relationship between haemoglobin and oxygen differs between loading and unloading sites. The haematological parameters such as RBC count, haematocrite (Hct) and haemoglobin were compared and found to be differed with reference to water dissolved oxygen, hydrogen ion concentration and temperature, there is lower RBC count, subsequently lower haemoglobin and haematocrite in the fish collected from Kagina river than the fish from other two
aquatic
bodies, this may be due to difference in the O2 or CO2 transport as a result of increased metabolic activity. The less number of erythrocyte count are likely due in part to an increase in oxygen consumption and metabolic rates corresponding to the rise in water temperature. High level of dissolved oxygen, moderate hydrogen ion concentration and temperature of water creates a suitable ground for its normal reproductive physiology of the fish.
Aman Ahmed, Samiksha Lodhi, Sanjive Shukla
International Journal of Fisheries and Aquatic Studies, Volume 9, pp 109-112; https://doi.org/10.22271/fish.2021.v9.i6b.2591

Abstract:
Freshwater prawn are promising candidates for aquaculture and knowledge of food and feeding habit is must for successful culture. Present
study
investigates the feeding mechanism and role of appendages in feeding behaviour of freshwater prawn, Macrobrachium lamarrei. Mostly preferred food was dried prawn powder and least preferred was groundnut cake. Prawns showed cannibalistic behaviour frequently in lab. Antenna and antennules were the main sensory appendages which help in locating and orientation while I & II chelate legs were used for detection, catching and transferring of food up to the mouth. Maxillipedes, maxilla and maxillula played the supportive role. Mechanism of feeding and functional role of different appendages in feeding behaviour have been discussed.
Anna At, Dinesh K
International Journal of Fisheries and Aquatic Studies, Volume 9, pp 113-119; https://doi.org/10.22271/fish.2021.v9.i6b.2592

Abstract:
This
study
aims at assessing the Physico-chemical properties of water and bottom soil quality in semi-intensive vannamei shrimp farms in Kerala, India. Six different farms were selected from four districts of Kerala based on the stocking density and the technical experience in vannamei shrimp farming, as designated as Farm1, 2, 3, 4, 5 and Farm 6 including triplicates of ponds with a stocking density of 15, 25, 30, 40, 50 and 60/m2. The majority of the water quality parameters do not show any significant (p
Bahar Kösem, Mehmet Oğuz Öztürk
International Journal of Fisheries and Aquatic Studies, Volume 9, pp 55-58; https://doi.org/10.22271/fish.2021.v9.i6a.2586

Abstract:
In this
study
, endohelminth parasite species were investigated in 49 Cobitis simplicispinna from Pinarbaşi spring water, Asia Minor between September 2009 and October 2011. Two endohelminth parasite species were determined in intestinal lumen of the host fishes. 116 number Crowcrocoecum skrjabini (%58, 4.0±3.7) and 198 Acanthocephala samples (%86, 4.6±3.5) were found. Among these species, Crowcrocoecum skrjabini is a new records for endohelminth parasite fauna of Cobitis simplicispinna from Asia Minor. Thus, a new locality has been added to geographical distributions of the parasite species. It was contributed to revealing the endohelminth parasitic fauna of Cobitis simplicispinna from the
study
area.
Mark Ariel D Malto, Antonino B Mendoza, Plutomeo M Nieves, Renan U Bobiles, Alex P Camaya, Skorzeny De Jesus
International Journal of Fisheries and Aquatic Studies, Volume 9, pp 282-287; https://doi.org/10.22271/fish.2021.v9.i6d.2612

Abstract:
Microplastic ingestion by marine organisms is becoming an emergency threat to seafood industry, with farmed mussels as of particular interest. The context of trophic transfer accords that humans are at large into exposure to microplastic through its consumption. In the province of Sorsogon, Philippines, green mussel Perna viridis is sorted into various ‘grading label’: Small (5.0-6.9 cm), Medium (7.0-8.9 cm) and Jumbo (≥9.0 cm) and are marketed within and outside the province. Total microplastic varied from 0.31 to 2.5 items/ individual. Mussel size ranged from 5.0-6.9 cm showed the highest microplastics (2.57 items/ individual) while mussels below 2.9 cm has the least microplastic (0.31 item/individual). The majority of ingested microplastics were lines, while their colors and sizes varied. Fourier Transform Infrared Spectroscopy (FT-IR) indicated organosiloxane and polyethylene terephthalate as the most common polymer type identified. The results suggested that microplastics detected in the mussels are relatively within the narrow range with no significant differences of its distribution across its categorical sizes. With the results can be used as a baseline contribution for the risk assessment of microplastic pollution in Sorsogon bay.
Ibnu Dwi Buwono, Roffi Grandiosa
International Journal of Fisheries and Aquatic Studies, Volume 9, pp 204-213; https://doi.org/10.22271/fish.2021.v9.i1c.2403

Abstract:
Marine bacteria which are symbionts with Eucheuma sp. and Sargassum sp. has the ability to convert seloluse into glucose. These processes are important during bioethanol production. Identification using PCR and 16S rRNA primers showed that the symbiotic bacteria in Eucheuma sp. was B. subtilis (97% identical to accession number NR. 027552.1) and symbiotic bacteria in Sargassum sp. was B. thuringiensis (97% identical to access number NR. 043403.1). Cellulotic indexes were identified for B. subtilis (2.477 mm) and B. thuringiensis (6.102 mm). Amplification of the endoglucanase gene were conducted with Bac-EuF and Bac-EuR primers in B. subtilis with size at 1416 bp (95% identical to accession number WP_017696508.1), whereas in B. thuriengeinsis the size was 1251 bp (92% identical to the accession number EEM47662). In silico analysis of the endoglucanase gene, showed that the catalytic and cellulose binding domains of B. subtilis were GH5 (aa residue 1-70) and CBM3 (aa residue 131-212), while in B. thuringiensis only GH8 catalytic domains were identified (aa residue 30 -370). The protein motif of the endoglucanase gene B. subtilis and B. thuringiensis had a high similarity characterized by the asn_glycosylation, camp_phospho_site, ck2_phospho_site, myristyl and pkc_phospho_site motif.
Sudhir Kumar Rawat
International Journal of Fisheries and Aquatic Studies, Volume 7, pp 150-154; https://doi.org/10.22271/fish.2019.v7.i5b.2593

Abstract:
Adult Gambusia could eat up to 150 mosquito larvae in an eight-hour period. This makes them an excellent biological tool for mosquito control because they eat the larvae before they have a chance to develop into adult mosquitoes. However, the use of Gambusia and Poecilla /guppy fish as biological weapons to control mosquito menace have had also been reported to have the opposite effect as well.
El Hadj Bara Deme, Moustapha Deme, Momodou Sidibeh,
International Journal of Fisheries and Aquatic Studies, Volume 9, pp 297-305; https://doi.org/10.22271/fish.2021.v9.i4d.2547

Abstract:
The objective of this article is to present a reflection on the valorisation of small pelagic in the Gambia from a mapping of the sector integrating landings, imports and exports, and local market supply. This mapping made it possible to determine the contribution of small pelagic to national food security, job creation, and finally the country's trade surplus in
fishery
products. Thus, the method consisted in building a database (production - consumption and foreign trade) over a height-year series (2013 - 2020) of the three most landed pelagic species (Bonga, the round and flat sardinella). These data were obtained from fishing statistics provided by The Gambia
Fisheries
Department - GFD. In terms of production, 85% of the stocks of small pelagic are landed fresh by artisanal canoes, and the remaining 15% come from the coastal and industrial fleet with almost non-existent imports. In addition, small pelagic are mainly marketed in the State (80% whole fresh and whole frozen), or in various stabilized forms (20% smoking and artisanal drying). The consumption of small pelagic per capita has fluctuated over the period 2009 - 2018 with an average of 14 kg / inhabitant / year and national disparities between urban and rural areas are noted. Economically, small pelagic dominate and contribute significantly to The Gambia's trade surplus in
fishery
products. In addition, the
study
highlights the lack of valorisation of small pelagic in the Gambia linked to several constraints and the emergence of new uses including processing into fishmeal which threatens national food security and the livelihoods of thousands of people (Gambians and foreigners). Public policies must be geared towards better valorisation of small pelagic to further boost the sector's contribution to the national economy, to the correct supply of the local market, and finally to the development of players in the fishing sector.
Anisa Mitra, Dola Roy, Sumit Homechaudhuri
International Journal of Fisheries and Aquatic Studies, Volume 9, pp 200-204; https://doi.org/10.22271/fish.2021.v9.i6c.2602

Abstract:
The chemical mutagenesis is an efficient way to produce new mutants for future genetic improvement in aquaculture species. Although these chemicals also induce toxicity. N-ethyl-N-nitrosourea (ENU) is an alkylating agent (SN1 type) and used as a chemical mutagen to
study
development and physiology of fishes. Although the concentration of ENU used in common protocols to mutagenize fish is limited by its toxicity in literature. In this article, an attempt has been made to identify the ENU associated toxicity to understand the fertilization, hatchability, survivability, and early developmental deformity to provide a baseline data. The fertilization and hatching rate decreased with increased concentration of ENU in Clarias batrachus. The LC50 value was observed as 5.7 (6.1, 5.3). The incubation periods were extended in the embryonic development with increasing concentrations of ENU. The observed deformities included unfertilized eggs, disintegrated yolk and blastodisc, retention of chorion, lordosis, retarded larvae and bent tail larvae, larva with no eye formation and larva with cardiac abnormality pooled blood in brain with tube heart. These embryos with deformities usually survived until hatching; however, embryos with more severe malformations died without hatching.
Shanchita Zaman Chowdhury, Mer Mosharraf Hossain
International Journal of Fisheries and Aquatic Studies, Volume 2, pp 17-22; https://doi.org/10.22271/fish.2015.v2.i4a.331

Abstract:
This
study
deals with the isolation and characterization of parasitic infection in Channa punctata collected from different water bodies in Jessore, Bangladesh. Skins, gills, intestine, kidney, liver were observed for finding parasites.
Kalidoss Manikandan, Nathan Felix, Elangovan Prabu
International Journal of Fisheries and Aquatic Studies, Volume 8, pp 128-133; https://doi.org/10.22271/fish.2020.v8.i5b.2314

Abstract:
Fisheries
sector serves as a substantial source of income and employment for a huge number of individuals around the world and it comparatively remains a crucial source of food and nutrition. Culture of
aquatic
species for food and ornamental purpose has been on increasing trend. High-performance feeds are formulated for the growth and progress of the cultured animals, usually supplemented with carotenoids of natural and synthetic origin. The market acceptability of ornamental fishes depends on pigmentation, one of the considerable attributes for determining quality. Carotenoids are a group of fat-soluble pigments broadly distributed in nature and are well recognized for their bright red, yellow, and orange colours.
Studies
on these carotenoids over decades have shown that these carotenoids are beneficial for the fish and crustacean aquaculture and also in the ornamental trade by imparting pigmentation. Canthaxanthin falls under the category of red keto-carotenoid and is one of the most important xanthophylls in the business perspective due to its extensive application in the field, next to astaxanthin. A large portion of the commercial canthaxanthin available in the market are chemically synthesized as the naturally available canthaxanthin are found in very lower concentrations. In addition, to a lesser extent, they are also implicated in the growth performances, digestion and as an anti-oxidant. This review updates the ongoing advancement on canthaxanthin on the dietary utilisation, storage, pigmentation and other enhanced growth performances on the aquaculture of food fish, crustacean and ornamental fishes.
Pinky Kaur, Anubhuti Minare, Bs Mourya
International Journal of Fisheries and Aquatic Studies, Volume 8, pp 107-111; https://doi.org/10.22271/fish.2020.v8.i5b.2311

Abstract:
Euclinostomum heterostomum (Rudolphi, 1809) metacercaria worldwide distributed digenetic trematode parasites distinguish to infect Channidae species. Molecular analysis using partial nuclear ribosomal
internal
transcribed spacer (ITS rDNA) marker was carried out and resultant 1005 base pairs. Phylogeny analysis showed that the present species claded among Euclinostomum with 100% nodal value and came close to E. heterostomum (KC894799) sequence from Thailand with 99% similarity. Scanning electron microscopy (SEM) was used to document the structural details of the oral and ventral suckers. EDX peaks revealed the presence of sulphur (S), calcium (Ca), and chloride (Cl) micro-elements from the entire tegument.
S Ramachandran, K Marimuthu, L Ramalingam
International Journal of Fisheries and Aquatic Studies, Volume 8, pp 304-308; https://doi.org/10.22271/fish.2020.v8.i4d.2287

Abstract:
The rarely occurred Hawkfish Cirrhitichthys bleekeri Day, 1874 is described based on the single specimen caught during demersal trawling survey conducted at 45 m depth of south west coast of India (9° 02.1’N; 76° 18.2’E at 40-45 m). An analysis of the morphometric, meristic characters and radiographic of the sample are compared with those of existing records of same and sibling species of the genus Cirrhitichthys (C.calliurus, C.aureus) and probability for putative hybrid of hawkfish species is discussed.
Israt Aman Aurpa, Mer Mosharraf Hossain, Hasan- Uj- Jaman, Hironmoy Sovon Roy, Hafeza Sultana Rosny, Shoumo Khondoker
International Journal of Fisheries and Aquatic Studies, Volume 4, pp 186-190; https://doi.org/10.22271/fish.2016.v4.i2c.687

Abstract:
The Recirculating Aquaculture Systems (RAS) with a biological filter is the most noticeable representative which treats
internally
the water polluted with dissolved organics and ammonia.
Sherajul Islam, Mer Mosharraf Hossain, Sharif Neowajh, Ibrahim Kholil, Aisha Khatun, Sharmin Rikta, A. M. Imteazzaman
International Journal of Fisheries and Aquatic Studies, Volume 2, pp 99-102; https://doi.org/10.22271/fish.2015.v2.i3b.216

Abstract:
Seven fresh bacterial isolates were isolated from disease affected fish species such as Labeo rohita, Cyprinus carpio, H. molitrix, and Puntius sarana from different carp farms and market sources.
Sanjay D Paunikar
International Journal of Fisheries and Aquatic Studies, Volume 9, pp 30-38; https://doi.org/10.22271/fish.2021.v9.i5a.2561

Abstract:
The present
study
was carried out to investigate the species diversity and population structure of freshwater fishes of six wetlands (also called Bird Sanctuaries) of Uttar Pradesh viz., Patna, Nawabganj, Sandi, Lakh Bahosi, Saman and Sur Sarovar. The sampling was done from three years period 2017 to 2020. The results of present investigation revealed the occurrence of twenty fish species in all the
study
areas belonging to four orders viz. Cypriniformes, Mastacembeliformes, Perciformes and Siluriformes and 11 families i.e. Cyprinidae, Cobitidae, Nemachilidae, Mastacembelidae, Channidae, Osphronemidae, Heterorpnuestidae, Sisuridae, Bagaridae, Chichlidae and Ambassidae. In all the
study
wetlands Cyprinidae was found to be dominant (35%), Osphronemidae (20%), Mastacembelidae, (10%), followed by family Cobitidae, Nemacheilidae, Channidae, Sisuridae, Bagaridae, Heterorpnuestidae and Ambassidae showed least contribution of 5% each. The fish diversity indices i.e. Shannon weiner (H) and Evenness (e) at all the six wetlands were 1.31, 0.9084 & 0.5710, 1.2068 & 0.6202, 1.0961 & 0.6117, 1.1552 & 0.4649, 0.9080 & 0.5068, 1.3002 & 0.6682 at wetlands viz, Patna, Nawabganj, Sandi, Lakh Bahosi, Saman and Sur Sarovar respectively. Most of the species recorded in the present
study
were under 19 Least Concern (95%) and 1 species namely Chagunius chagunio were found to be under Near Threatened Category (5%) of the
International
Union for Conservation of Nature (IUCN).
Amos Asase, Justice Eric Darko, Wilson Bagyile Temta, Daniel Asare, Samuel Henneh
International Journal of Fisheries and Aquatic Studies, Volume 9, pp 18-22; https://doi.org/10.22271/fish.2021.v9.i5a.2558

Abstract:
This
study
analyzed the potential of harvesting eggs and fry at different time intervals for improved seed production of Nile tilapia. Broodstock were put in 3x1m2 hapas at a sex ratio of 3 females: 1male. Eggs and fry were harvested at intervals of 8 days, 10 days, 12 days and 14 days respectively. The results showed a direct positive relationship between the harvesting frequencies and total seed production, where Broodfish in the 14 days treatment produced the highest total seed output (13979 ± 314) followed by 12 days (10167 ± 248), 10 days (6645 ± 135) and 8 days (4509 ± 112) respectively. The 8 days harvesting frequency consistently recorded zero swim up fry throughout the
study
while the 10 days treatment yielded the highest egg counts of 4272 ± 127. The specific growth rates and condition factors of females did not significantly differ among all the treatments.
Ak Mandal
International Journal of Fisheries and Aquatic Studies, Volume 9, pp 217-222; https://doi.org/10.22271/fish.2021.v9.i4c.2538

Abstract:
Dried fish marketing plays an important role in the economy of Bangladesh, contributing to increased gross domestic product, diversification of the economy and increased employment opportunities. The aim of this
study
to examine the existing marketing system, identify different marketing channel and to estimate the value addition of different actors who are involved in the marketing chain of dry fish. Multi-stage stratified simple random sampling technique has been used in selecting the sample and the total 120 respondents were selected from the Patuakhali and Coxs Bazar for the
study
. Data were collected through interview schedule. The
study
found that the process of preparing dried fish starts in October and end in February or March. Dry fish processor followed horizontal and vertical drying method. The
study
also revealed that seven channels were identified in dry fish marketing. Dry fish processors sold (90%) their dried fish to dry fish aratders. The per quintal average marketing cost was estimated of dried fish in different actors like dried fish processor for Tk. 3942, arathder for Tk. 53.68, wholesaler for Tk. 1485 and retailer for Tk. 110. Value addition of the dried fish processor, arathder, wholesaler and retailer were calculated Tk. 4935, Tk. 1237.32, Tk. 2019, and Tk. 4862 per quintal respectively.
Velasco Sj, Arroyo Dm, González Am, Hernández Mpa, Beltrán Rsa, Aquino Pri, López Hh, Velázquez Oci, Retana Oda
International Journal of Fisheries and Aquatic Studies, Volume 9, pp 45-51; https://doi.org/10.22271/fish.2021.v9.i5a.2564

Abstract:
For the present
study
, the growth and survival of 30 juvenile axolotls of the Ambystoma mexicanum species fed with a probiotic were evaluated. At the beginning of the investigation, the specimens had an average size and weight of 4 ± 0.5 (cm) and 2 ± 0.3 (g) respectively. Throughout the
study
the organisms were kept in six aquariums with 40 L of fresh water, at a temperature of 15 ± 1 °C, with a natural photoperiod and with 5 axolotls each. The axolotls were fed for 24 weeks with the Tubifex tubifex slimeworm inoculated with 1 X 107 CFU/g with the probiotic PROBION-Forte© (Bacillus subtilis, Bacillus coagulans and Clostridium butyricum). To verify the effect of the probiotic on the organisms, survival, growth (height and weight) as well as their degree of well-being were determined. The results reveal that the specimens fed the enriched diet present a survival of 100% compared to those fed the unenriched diet was 75%. On the other hand, the growth showed significant differences between the two treatments (p
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