Aquatic Research

Journal Information
EISSN : 2618-6365
Published by: Scientific Web Journals (SWJ) (10.3153)
Total articles ≅ 116
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Jurmin H. Sarri, Yusop A. Abdulmutalib, Melapearl E. Mohammad Tilka, ,
Published: 1 January 2022
Journal: AQUATIC RESEARCH
AQUATIC RESEARCH, Volume 5, pp 99-109; https://doi.org/10.3153/ar22009

Abstract:
One of the problems in Kappaphycus farming is the slow growth in some farms due to nutrient insufficiency caused by overstocking. In the southern Philippines, most seaweed farmers practice inorganic nutrient enrichment of Kappaphycus to boost growth and decrease ice-ice disease occurrence using ammonium phosphate at an average concentration of 8.82 g L-1. In this study, experiments with Kappaphycus striatus enriched with inorganic nutrients were carried out at Pasiagan, Bongao, Tawi-Tawi, southern Philippines, using different inorganic nutrients (T1=8.82 g L-1 of urea, T2=8.82 g L-1 of phosphorus, and T3=control) within 45 days. Seaweeds were enriched in these three inorganic solutions for 30 seconds, placed into a large mat, covered with canvas, and left overnight. After 15 days, findings showed that the specific growth rates of T1 (6.99% day-1) and T3 (6.72% day-1) groups were significantly higher than the T2 (5.84% day-1) group (p<0.05). Inorganic nutrient enrichment did not significantly influence the occurrence of ice-ice disease. Moreover, inorganic nutrient enrichment did not affect the carrageenan yield after 45 days. K. striatus nutrient-enriched with urea could increase growth at day 15, but no effect on the occurrence of ice-ice disease and carrageenan yield. Hence, inorganic nutrient enrichment using urea provides a positive effect to farmed K. striatus by enhancing its growth without affecting its health and carrageenan yield.
Published: 1 January 2022
Journal: AQUATIC RESEARCH
AQUATIC RESEARCH, Volume 5, pp 53-62; https://doi.org/10.3153/ar22006

Abstract:
Two specimens of the butterfly blenny, Blennius ocellaris, were caught off the coast of Ordu (Black Sea, Turkey) in April 2021 by trammel net. The aim of this paper is to further document occurrence and distribution of the butterfly blenny for the Black Sea and for Turkish marine ichthyofauna and to provide first morphometric, reproduction, and genetic data on this species to the Black Sea fauna species. Some morphometric and meristic characters were measured and presented as the percentage of total length (TL%). All morphometric measurements except eye diameter, pre-anal length, and maximum body depth were higher in the male individual. It was observed that the head makes up almost 1/4 of the body. It was determined that the ripe eggs were in their final stage of development (Stage IV). Gonad’s weight of a female individual was 2.85 g and the number of eggs was determined as 2993. The mean egg diameter was measured as 1070.7 ±15.63 μm (from 1050.2 to 1123.1 μm). The mitochondrial DNA gene regions of 16S rRNA and COI of the specimens were sequenced and analyzed. The generated partial sequences of COI and 16S rRNA were 621 bp and 551 bp, respectively. The maximum likelihood tree generated with the COI gene sequences retrieved from the GenBank database demonstrated geographic region-based distinction and sequences of the Black Sea specimens nested with the reference specimen sequences from the Western Mediterranean Sea and the Sea of Marmara.
Hilal Yılmaz, Gülsen Avaz, , Melek Özkan
Published: 1 January 2022
Journal: AQUATIC RESEARCH
AQUATIC RESEARCH, Volume 5, pp 20-28; https://doi.org/10.3153/ar22003

Abstract:
Micropollution is a serious environmental problem caused by continuous entry of trace quantities of toxic chemical substances into the aquatic environment. In the present study, three trophic levels of the aquatic ecosystems were used to evaluate the acute toxicities of environmentally important micropollutants including heavy metals, pesticides and drugs. There is a scarcity of information on toxicity of the studied substances on marine water algae. Among studied micropollutants, the most toxic chemical to Daphnia magna and Danio rerio was found to be 1-Chloro-2,4 dinitrobenzene with EC50 of 0.002 and 4.2 mg/L, respectively. Although this compound was also toxic to marine algae, Phaeodactylum tricornutum, arsenic showed the highest toxicity to the algae with EC50 of 2.4 mg/L. As compared to other organisms, D. magna was found to have higher sensitivity to all of the tested micropollutants.
Published: 1 January 2022
Journal: AQUATIC RESEARCH
AQUATIC RESEARCH, Volume 5, pp 11-19; https://doi.org/10.3153/ar22002

Abstract:
In the present study, possible effects of using Potamon ibericum for the prevention of zebra mussel (Dreissena polymorpha) invasion in a freshwater ecosystem were investigated. In a recirculating aquaculture system (RAS) supplied with aerated freshwater, 3 individuals of P. ibericum were placed in each of 3 aquariums provided by 100 zebra mussels. Throughout the 90-day monitoring study, mussel consumption was visually counted and then new mussels were introduced daily to complete the number of mussels to hundred, repeatedly each day. Throughout the monitoring study, growth rates, number of mussels consumed, and the number of broken mussel shell pieces were determined. Daily consumption rate of mussels by each crab was recorded as 11.115, 11.104, and 11.107 mussel/crab in the 3 experimental groups, respectively. The consumption rate of mussels per crab was counted as 999.78 over the 90-days experiment. As a result, the findings of this study provide strong evidence that P. ibericum can be used for
Published: 1 January 2022
Journal: AQUATIC RESEARCH
AQUATIC RESEARCH, Volume 5, pp 89-98; https://doi.org/10.3153/ar22008

Abstract:
In recent years, maritime-related organizations and companies have moved to a risk-based approach. To determine the risks, it is necessary to understand comprehensively why accidents occur and how it develops. The most effective measures need to be identified to implement the accident prevention measures successfully. According to the results of scientific studies conducted in the past, 80% of human factors risks were effective in marine accidents. Nowadays, maritime technologies are the most effective method for reducing the risks of human factors. However, the use of electronic navigation devices has not eliminated accidents. In this study, the accident reports for collision and grounding due to the electronic navigation devices' risk was evaluated using Human Factors Analysis and Classification System (HFACS) method. As a result of the study, more than half of the visible (active) causes of accidents have been identified as operating failure factors in electronic navigation equipment. Recommendations to prevent the occurrence of accident factors have been made.
Jorge A. Rosales-Casián
Published: 1 January 2022
Journal: AQUATIC RESEARCH
AQUATIC RESEARCH, Volume 5, pp 165-170; https://doi.org/10.3153/ar22016

Abstract:
An individual of the Cortez angelfish, Pomacanthus zonipectus (Gill, 1862) was obtained at the temperate Bahía de San Quintín, Baja California, México (Lat. 30.428343, Long. 115.987014), on May 15, 2021. All counts, morphological descriptions, and colors of the specimen caught agree with the previous descriptions for the species P. zonipectus. The Cortez angelfish is a tropical fish species, and its presence at the temperate environment may possibly be associated with warming events, The Blob-El Niño 2013-2016, or the most recent moderate El Niño 2018-2019. This occurrence constitutes the first record for the Cortez angelfish in the San Quintín area, northern Pacific off Baja California, and after thousands of samplings with different fishing gears beginning in 1993. The Cortez angelfish was recently recorded in August 25, 2016 as a new occurrence in Laguna Ojo de Liebre, Baja California Sur, México, also in the same warming event of The Blob-El Niño 2013-2016; from Ojo de Liebre to Bahía de San Quintín represents a northward movement of 355 kilometers and a new record in its distribution.
Aslı Çilingir Yeltekin
Published: 1 January 2022
Journal: AQUATIC RESEARCH
AQUATIC RESEARCH, Volume 5, pp 110-116; https://doi.org/10.3153/ar22010

Abstract:
Today, fungicide toxicity is quite common in aquatic ecosystems, and this situation adversely affects marine organisms. For this reason, it is essential to determine the effects of fungicides on aquatic organisms and to try to prevent organisms from being exposed to these toxic chemicals. In this study, changes in cholinergic system enzymes and (malondialdehyde) MDA levels as a result of exposure to acute fungicide toxicity in Van fish (Alburnus tarichi, Güldenstädt 1814) were investigated. Brain tissue was taken from Van fish exposed to 2.5 M Tebuconazole used in agriculture by sampling at 24, 48, 72, and 96 hours. Brain tissue acetylcholinesterase (AChE), butyrylcholinesterase (BChE) activities, and MDA levels were measured in this context. In the study, AChE (0.965 ±0.03, 0.575±0.01) and BChE (0.421 ±0.02, 0,291 ±0.01) activities decreased in Van fish brain tissue due to exposure to Tebuconazole, but MDA (0.099 ±0.01, 0.192 ±0.01) level increased (p < 0.05).
Seda Kuşoğlu Gültekin, Elif Mertoğlu Kamalı, Kaan Yılancıoğlu,
Published: 1 January 2022
Journal: AQUATIC RESEARCH
AQUATIC RESEARCH, Volume 5, pp 117-128; https://doi.org/10.3153/ar22011

Abstract:
Microcystis aeruginosa, which spreads in five continents in the world and reported in drinking water resources in 257 countries, is a dangerous microalgae for human and animal health due to its toxins. The aim of current study was to evaluate the effects of M. aeruginosa extract and its chromatographically separated fractions on human endothelial cells. In this context, crude extract was prepared from M. aeruginosa cultured in BG-11 medium, and it was fractionated by an optimized HPLC method. Algae extract and its six fractions were then analyzed for their cytotoxic effects on ECV304 using MTT assay. The results revealed that algae extract inhibited ECV304 cells by around 72%, a higher percentage than all fractions. The most toxic fraction was the first fraction, which inhibited the cells by 55%. Other fractions, except the third one, were also toxic with 35-40% inhibition percentages. Third fraction and certain doses of some fractions showed proliferative activity on ECV304 cells. These results showed that the activities of the total extract and its fractions in promoting or inhibiting cell proliferation varied depending on not only the content but also the treatment dose.
Mimetullah Korkut, Mustafa Koyun
Published: 1 January 2022
Journal: AQUATIC RESEARCH
AQUATIC RESEARCH, Volume 5, pp 154-164; https://doi.org/10.3153/ar22015

Abstract:
Some Cyprinid fish species: Cyprinion macrostomum (Heckel, 1843), Capoeta umbla (Heckel, 1843), Chondrostoma regium (Heckel, 1843), and Squalius cephalus (Linnaeus, 1758) living naturally in the Murat River, were investigated for Protozoan and Crustacean parasite fauna and their distribution. Fish samples were collected from different stations between July 2017 - June 2019, examined in the Bingöl University Zoology Research Laboratory, and the data were explained with various variables. The normality test revealed that the data were not normally distributed (p< 0.05), as with large samples, so non-parametric tests explained the data. A total of 365 fish were examined, and 100 fish (27.4%) were infected with at least one Protozoan or Crustacean parasite. Four different parasite species were recorded on the examined fish, namely Ichthyophthirius multifiliis and Trichodina sp. belonging to the phylum Ciliophora (Protozoan), Ergasilus sieboldi, and Lamproglena pulchella belonging to the phylum Arthropoda (Crustacean). As a result of this study, for the first time, Protozoan and Crustacean parasites of different cyprinid fish were examined according to the host species, seasonal distribution, host size, and new host records were reported for three parasites.
Arif Parmaksız, Elif Korkmaz, Dilara Ulusal, Necmettin Doğan
Published: 1 January 2022
Journal: AQUATIC RESEARCH
AQUATIC RESEARCH, Volume 5, pp 129-135; https://doi.org/10.3153/ar22012

Abstract:
Natural fish species living in the Euphrates River System; It is subject to some pressures such as overfishing, competition with invasive species and habitat loss. As a result of these pressures, it leads to the decrease of endemic and native species. At the beginning of these species are the species belonging to the Barbus Cuvier & Cloquet, 1816 and Luciobarbus Heckel, 1843 genera, which have high economic importance. In this study, phylogenetic analysis of the species belonging to the genus Barbus Cuvier & Cloquet, 1816 and Luciobarbus Heckel, 1843, which live naturally in the Euphrates River, was carried out with mtDNA COI gene sequences. 17 fish samples belonging to five species from three localities belonging to the Euphrates river system (Turkey) were studied. Total DNA extraction was performed from muscle tissue using Commercial Kit. Then the mtDNA COI region was amplified by PCR and sequenced. Genetic distance values were calculated between 0.00201 and 0.15332, and it was determined that the closest species were L. xanthopterus and L. esocinus, and the most distant species were B. lacerta and A. grypus. In addition, phylogenetic analyzes of the target species were made and an phylogenetic tree was formed and the species were distinguished. In future studies, it is recommended to evaluate the data in this study, to determine the genetic characteristics of populations, and to carry out conservation studies at the population level.
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