Journal of Fisheries Science
EISSN : 2661-3387
Published by: Bilingual Publishing Co. (10.30564)
Total articles ≅ 39
Latest articles in this journal
Journal of Fisheries Science, Volume 4; https://doi.org/10.30564/jfsr.v4i2.4418
Bacteria identification in fish is important; hence it provides update information on emerging and existing organisms thereby enriching the gene bank on fish disease. This study investigated bacteria associated with milt in cultured samples of African catfish- Clarias gariepinus. Catfish broodstock were collected from private Fish Farm in Ogun State, Nigeria. Fish samples were taken to the Microbiology laboratory, Federal University of Agriculture, Abeokuta Ogun State for milt microbial analyses, and amplicon were taken to International Institute of Tropical Agriculture, Ibadan for molecular characterization. Bio-edit was use for importing and mining nucleotide sequences into gene bank. The results revealed that the following bacterial organisms were present in the milt of Clarias gariepinus: Aeromonas caviae, Proteus mirabilis, Serratia rubidaea, Pseudomonas mosselii, Acinetobacter soli and Klebsiella variicola. The Basic Local Alignment Search Tools revealed the percentage similarity ranging from 86- 97.04% and their accession numbers. These bacteria indicated high levels of faecal contamination in the environment. In conclusion, bacteria were found in the milt of cultured catfish and are capable of being pathogenic to humans and may increase the vertical transfer to fry during breeding and rearing stage.
Journal of Fisheries Science, Volume 4; https://doi.org/10.30564/jfsr.v4i2.4478
Nigeria waters are rich with a variety of fish species but only very feware cultured and available for consumption. This study was conducted toknow the fillet quality, gut content and condition of Parachanna obscuraand Clarias agboyiensis in Nigeria using Igbokoda river as a referencebecause it is a the major fishing site in the nation. Studies were conductedon the viscera somatic index based on the organ weight and the bodyweight of the fish and the food item consumed by Parachanna obscura andClarias agboyiensis between May to October, 2019 to infer on the filletquality and gut content of P. obscura and C. agboyiensis in the water bodyrespectively. A summary of food items that constituted the diet of Clariasagboyiensis are Baccillariophyta, fish, fat droplets, dinoflagellate, insectand Chlorophyta which constituted the most important food items bothoccurring in all stomachs containing food. The fishes has more muscle thanthe viscera organs which indicate that the weight of the fish before dressingout is higher than the weight of the fish after dressing out. This is suggestiveof a good quality of food fish. There was a significant correlation betweenbody weight and total length of specimens found in this study. Increasesin total length resulted in corresponding increases in body weight. Theresult for the condition factor showed was below the expected or standardvalue (K = 1) which shows this species was not in favorable environmentalcondition. It is therefore necessary to allow phytoplanktons grow well inwater body to increase availability of food items to Parachanna obscuraand Clarias agboyiensis. P. obscura and C. agboyiensis are also good foodfishes of a high fillet quality. They are omnivorous feeders therefore havingpotentials for aquaculture.
Journal of Fisheries Science, Volume 4; https://doi.org/10.30564/jfsr.v4i1.4311
Present review article explains the dietary and nutritional value of various fish derived natural food products. Dietary use of fish is a good source of important nutrients such as proteins, fats, vitamins and minerals.. Fish oil possesses polyunsaturated fatty acids (PUFAs) mainly omega-3 fatty acids, eicosapentaenoic acid (EPA), docosahexaenoic acid (DHA), and eicosanoids. Fish consumption is world's prime source of high-quality protein; and about 14–16 percent of the animal protein consumed worldwide. This article also emphasizes therapeutic uses of fish oil in healing of wounds, hyperpigmentation, dermatitis, and in cardiovascular risks. Fish oil usage is good for skin-related diseases and for photoageing, cancer, dermatitis, wound healing, and melanogenesis. Fish oil polyunsaturated fatty acids (PUFAs) are highly beneficial in cardiovascular problems and dermatitis. These also affect neurotransmitter signaling and second messengers and shows antidepressant activity. In the present review various local, national, and international processed fish derived food currently available in the market fish dishes have been mentioned.
Journal of Fisheries Science, Volume 4; https://doi.org/10.30564/jfsr.v4i1.4277
Tagelus adansonii has served as man’s food around the world from time immemorial. However, the aquatic ecosystem in which they live is constantly polluted. Microbial and proximate compositions and energy value of T. adansonii were evaluated as indices for food safety and biomarker of pollution. Standard microbiological techniques and standard methods of AOAC were employed. Results showed that Bacillus substilis, Micrococcus sp, Proteus sp, Klebsiella sp, Staphylococcus aureus, Vibrio cholerea, Vibrio parahaemolyticus, Enterobacter sp, Escherichia coli, Bacillus cereus, and Chromatiumsp were the probable bacteria while Rhizopus stolonifer, Aspergillus niger, Penicillium sp. Candidatropicalis, Fusarium sp. and Aspergillus flavus were the probable fungi isolated from the sample. Total Heterotrophic Bacterial Count (THBC), TVC, TCC, TSC and TFC in fresh sample were 2.01±0.14 x 105, 2.77±0.27x10, 2.79±0.81x10, 6.08±0.21x102, and 2.08±0.21x104 cfu g-1 respectively and concentrated mostly in the gut. The mean crude protein, moisture, carbohydrate, ash, lipid and crude fibre contents of the soft tissues were 60.92±2.38, 40.75±1.85, 26.58±2.91, 5.99±0.43, 5.56±0.51 and 4.13±0.10% respectively while the energy or caloric value was 397.65±11.97. Proper monitoring and surveillance should be adopted by Government to check pollution of the aquatic environments and proper processing should be adopted before consumption for good public health.
Journal of Fisheries Science, Volume 3; https://doi.org/10.30564/jfsr.v3i2.3371
Aquaculture in pond and floodplain was accelerated in Bangladesh in the 1990s as a means of better production and income which was backed by the donor agencies, NGOs, and the government. Currently, the commercial actors are involved in the aquaculture systems due to the availability of production technologies and inputs. This paper aims to explore how the commercialization and privatization of floodplain aquaculture become the cause of the sufferings of the natural resource-dependent people and biodiversity loss in the floodplains. Now, Influential people hold control of the common pool floodplains and restricted the access of the Small-Scale Fishers (SSF) to manage the aquaculture. Our findings suggest that the SSF, for whom the seasonal floodplains were an important source of livelihood, their livelihood has been destroyed and overall wellbeing have been negatively affected. Besides that, lending enough evidence to the increased inequality, a new group of poor has emerged. Because instead of ensuring the welfare of SSF, Bangladesh government has leased the floodplain lands to the powerful rich people. In addition to growing inequalities, natural resource degradation has welcomed social vulnerabilities. However, no development initiative will ever be sustainable and effective if the existing socio-ecological setting is not considered. Bangladesh government should take robust attempts to revisit fisheries policies to ensure livelihood resilience of fisheries resource-dependent community by managing the access rights of the common pool resources.
Journal of Fisheries Science, Volume 3, pp 19-35; https://doi.org/10.30564/jfsr.v3i2.3693
Hydrobiological survey of a ‘soft-water’ and ‘highly de-mineralized’ reservoir of Meghalaya state of northeast India is undertaken to analyze zooplankton diversity with reference to the spatio-temporal variations and influence of abiotic factors. The littoral and limnetic zooplankton assemblages of this subtropical reservoir without aquatic vegetation reveal total 36 species, and record lower abundance, quantitative dominance of Rotifera, sub-dominance of Cladocera and Copepoda and moderate species diversity. Keratella cochlearis, Bosmina longirostris, Polyarthra vulgaris, Mesocyclops leuckarti, Conochilus unicornis and Asplanchna priodonta influence abundance, species diversity, dominance and equitability of zooplankton. We report differential spatial influence of individual abiotic factors with the relatively more importance at the limnetic region, and the canonical correspondence analysis registers 72.5% and 78.8% cumulative influence of 10 abiotic factors on the littoral and limnetic assemblages, respectively. The spatial differences of various diversity aspects and the influence of abiotic factors suggest habitat heterogeneity amongst the two regions. This study is a useful contribution to zooplankton diversity of the subtropical environs, and soft and de-mineralized waters in particular. Our results mark a distinct contrast to the lowest richness and abundance of zooplankton noted from India vide the preliminary 1990-91 survey of this reservoir.
Journal of Fisheries Science, Volume 3, pp 45-49; https://doi.org/10.30564/jfsr.v3i2.3742
Alterations in blood variables of Sarotherodon melanotheron transmitted immediately from brackish water (salinity 13.71‰) to fresh water (salinity 0.12‰) were examined to evaluate the consequence of abrupt alterations in the environment on fish blood parameters. The results acquired revealed that significant reduction (p < 0.05) in mean values of Haemoglobin (Hb) from 7.37±1.22 to 4.30±0.82dl-1; Packed Cell Volume (PCV) 23.48±3.22 to 15.08±2.97%; Red Blood Cell (RBC) 5.99±0.72 to 3.31±0.77 Cells x106 ; Mean Corpuscular Haemoglobin Concentration (MCHC) 31.68±3.66 to 28.48±2.03 pg; and Platelets (PLT) 195.44±16.77 to 138.99±9.05 103 uL-1. However, notable elevation was recorded in the values of Erythrocyte Sedimentation Rate (ESR) from 4.89±0.16 to 10.58±1.48 mm/ hr; White Blood Cell (WBC) 27.03±2.96 to 33.09±3.72 x 109 L-1; Mean Corpuscular Volume (MCV) 39.33±3.07 to 45.88±7.03 fL Neutrophils (NEUT) 41.71±3.08 to 48.30±7.99%; Lymphocytes (LYMP) 54.60±3.99 to 46.36±9.87% and Monocytes (MON) 3.80±1.04 to 5.97±1.99%. These variations in the blood parameters were more perceptible in adult than juvenile fish. Results from this study consequently imply that direct transfer of fish to a region of lower salinity may have damaging effect on the physiology of S. melanotheron as observed in this study.
Journal of Fisheries Science, Volume 3, pp 12-18; https://doi.org/10.30564/jfsr.v3i2.2644
In May and October 2017, 12 stations were set up in the Central Bohai Sea for fishery resources investigation. The results show that there are many dominant species in this area, and the inshore fishery resources are higher than those in the open sea because of the abundant nutrients from land, the high density of zooplankton and the food of swimming animals. In order to effectively protect the fishery resources in the Central Bohai Sea, this paper puts forward some suggestions, such as strengthening the protection propaganda, scientific and reasonable fishing, and strengthening the management of marine environment.
Journal of Fisheries Science, Volume 3, pp 36-44; https://doi.org/10.30564/jfsr.v3i2.3741
The effect of different combinations of botanical spices such as clove and nutmeg in different proportion on the antioxidants activities which include lipid peroxidation (LPO), superoxide dismutase (SOD), catalase (CAT), glutathione-S-transferase (GST) and glutathione peroxide (GPX) in juveniles and adults sizes of Clarias gariepinus was investigated using different combinations of clove (C),and nutmeg (C.N 0:0- Control 0% of Clove and Nutmeg; C.N 1:3- 25% Clove and 75% Nutmeg; C.N 3:1- 75% Clove and 25% Nutmeg; C.N 2:2- 50% Clove and 50% Nutmeg; C.4 - 100% Clove; N4- 100% ) in triplicates. The results from the study indicated that the anaesthetic caused a significant (p<0.05) alterations in the five antioxidants under investigation. The highest alterations in the studied antioxidants were observed in the fish exposed to C4 combination of the anaesthetics and the lowest in the control. The results from this work therefore suggest that the anaesthetics can alter antioxidants levels in the fish which was more noticeable in the fish exposed to C.N 3:1- 75% Clove and 25% Nutmeg; C.N 2:2- 50% Clove and 50% Nutmeg; C.4 - 100% Clove; N4- 100% . Hence fish farmers and scientists are advised to take caution when combining these plant extracts for use in aquaculture.
Journal of Fisheries Science, Volume 3; https://doi.org/10.30564/jfsr.v3i1.3253
Condition indices study like RNA content, DNA content, RNA: DNA, RNA: protein, RNA: lipid was carried out in goby, Parachaeturichthys ocellatus from the creeks of Mumbai to assess its nutritional status in different months. The study was carried out from June 2010 to September 2011.The range of RNA content in male was 72-185.6 µg/100 mg while in female was 82-145.46 µg/100 mg. RNA content was high during spawning months. The DNA content showed slight variations with range of 22.56- 39.31 µg/100 mg in males and 25.20-32.52 µg/100 mg in females. The range of ratio of RNA: DNA in males was 2.08-5.13 with an average of 3.74 while in female was 2.92-5.07 with an average of 3.99. The ratio above 2 indicates good condition. The RNA: protein showed an average of 0.0015 in males and 0.0017 in females while the average of RNA: lipid was 0.0176 in males and 0.0127 in females. RNA: protein and RNA: lipid showed the lowest values in post reproductive stages while it increased with the onset of reproductive cycles. The condition indices study showed that P. ocellatus was in good condition throughout the year and the creeks of Mumbai were suitable habitat for feeding and reproduction.