Turkish Journal of Aquatic Sciences最新文献_第5页

Economic realities and management systems in aquaculture production 水产养殖生产的经济现状和管理制度

Turkish Journal of Aquatic Sciences Pub Date : 2021-08-03 DOI: 10.4314/jas.v36i1.10

A. Garba

{"title":"Economic realities and management systems in aquaculture production","authors":"A. Garba","doi":"10.4314/jas.v36i1.10","DOIUrl":"https://doi.org/10.4314/jas.v36i1.10","url":null,"abstract":"This study reviewed and unveiled the economic sizes and managing systems in aquaculture production. The focus had been on developing new technologies and management systems in aquaculture production that can produce fish food on an economically competitive basis while still maintaining environmental health. The technique of recirculating aquaculture system (RAS) had been discussed. Economic issues such as: adequately available quality water, economic sizes, management issues, financial capabilities, various investment options, species selection, cost of production, capitalization cost of unit process, cost of pumping and bio-filtration, gas stripping and pH control, solid wastes removal, economically competitive scale, labor requirements as wellas predicted cost of production. The economic comparison of broilers and catfish production were evaluated. Also, challenges against the effective aquaculture technological application and the prospects to economic realities and management systems in aquaculture production were also highlighted. It could be concluded that economic realities and management of RAS is the soft and live wire in aquacultural development especially in developing countries like Nigeria. It is therefore, recommended that fish farmers need to engage and be trained on the use of this new fish production technology for increase production and economy benefits.","PeriodicalId":32064,"journal":{"name":"Turkish Journal of Aquatic Sciences","volume":"101 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-08-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78105743","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Species Composition, Dominance and Similarity Index of Macrobrachium vollehovenii and M. Felicinum in Akor River, Ibere, Ikwuano, Nigeria 尼日利亚Ikwuano Ibere Akor河vollehoven沼虾和M. Felicinum的种类组成、优势度和相似性指数

Turkish Journal of Aquatic Sciences Pub Date : 2021-04-16 DOI: 10.4314/JAS.V35I2.19

J. Ukagwu, D. Anyanwu, M. C. Orgi, S. Ohaturonye, C. Dan-Uchegbu

{"title":"Species Composition, Dominance and Similarity Index of Macrobrachium vollehovenii and M. Felicinum in Akor River, Ibere, Ikwuano, Nigeria","authors":"J. Ukagwu, D. Anyanwu, M. C. Orgi, S. Ohaturonye, C. Dan-Uchegbu","doi":"10.4314/JAS.V35I2.19","DOIUrl":"https://doi.org/10.4314/JAS.V35I2.19","url":null,"abstract":"Occurrence and abundance of Macrobrachium vollehovenii and Macrobrachium felicinum were studied in Akor river, Ibere, Ikwuano, Nigeria. The area density method of sample collection was employed. The river was delineated into three stations: A, B and C and prawn specimen were collected fortnightly. Sample collection lasted for 24 months. Species composition, dominance and similarity index were calculated using standard methods. Chi square test was used to compare the dominance of both species in the River. Results showed that station A had a total catch composition of 1,407 (29.4%), station B recorded 1,689 (34.73%) and the highest catch was obtained in station C having 1,763 (36.2%). The overall total catch of 4,859 was recorded. Results also showed that M. vollehovenii dominated the river with a total number of 3,620 (75%) while M. felicinum had a total catch of 1,239 (25%). Ponderal index was 53.7 and 44.7 for M. vollehovenii and M. felicinum respectively and a similarity index of 1 for both species was observed. Statistical analysis showed that there was significant difference (p<0.05) between dominance of these species in Akor river. Inference from the results showed that these species are present as non-target organism in this river. \u0000Keywords: Occurrence, abundance, Macrobrachium species, fresh water, crustacean","PeriodicalId":32064,"journal":{"name":"Turkish Journal of Aquatic Sciences","volume":"33 1","pages":"165-171"},"PeriodicalIF":0.0,"publicationDate":"2021-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77796108","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Viability of Different Strains of Lactobacillus fermentum in Feed and Effects on Growth Performance of Clarias gariepinus Fry 饲料中不同菌种发酵乳杆菌的活力及对鸡尾Clarias gariepinus苗生长性能的影响

Turkish Journal of Aquatic Sciences Pub Date : 2021-04-16 DOI: 10.4314/JAS.V35I2.21

J. Ikwuemesi, E. Ajani, B. Emikpe

{"title":"Viability of Different Strains of Lactobacillus fermentum in Feed and Effects on Growth Performance of Clarias gariepinus Fry","authors":"J. Ikwuemesi, E. Ajani, B. Emikpe","doi":"10.4314/JAS.V35I2.21","DOIUrl":"https://doi.org/10.4314/JAS.V35I2.21","url":null,"abstract":"Globally, aquaculture has developed significantly; however, poor performance at larvae stage is still a challenge. The use of antibiotics has post-application effects in aquaculture hence the demand for eco-friendly alternatives. The Lactobacillus fermentum strains BCS27 and F4S8 isolated from fermented maize and cassava respectively were supplemented in six isonitrogenous (55% protein) fry diet in three different concentrations (3x107, 6x107 and 9x107cfu/ml/100g) with a positive (T0) and negative (AT0) controls. The strain BCS27 were included in these concentrations to give treatments LF1T1, LF1T2, LF1T3 while strain F4S8 represented treatments LF2T1, LF2T2, LF2T3. Three-day old Clarias gariepinus larvae (0.005g) were fed to satiation for eight weeks in a completely randomized design. The highest mean weight gain (MWG) of 0.4116±0.02g and specific growth rate (SGR) of 0.9765±0.05%/day were recorded in LF1T1. Quadratic regression analysis of growth indices against microbial counts revealed that at concentration of 50.7CFU/ml the best weight gain of 0.39g was obtained. The treatment LF1T1 also produced the highest protein efficiency ratio (PER) (0.007±0.0003) and nitrogen metabolism (NM) (4.86±0.23). Survival was significantly low (22.5±5.1%) in AT0 while the highest value (42.3±3.18%) was recorded in LF1T1. Amongst strain F4S8, LF2T1 had significantly higher (p<0.05) MWG (0.4197±0.01g). The optimum treatment concentration was 62.5CFU/ml at 0.33g MWG. The treatment LF2T1 also had the best PER of 0.007±0.000 while T0 recorded the least value (0.003±0.0004). The highest survival (44.2±1.5%) was recorded in LF2T2. The studied L. fermentum strains was viable in the feed which successfully improved the performance and nutrient utilization in C. gariepinus larvae. Thus, it’s application in fish feed production is recommended. \u0000Keywords: Lactobacillus fermentum, growth, C. gariepinus, fry, larvae.","PeriodicalId":32064,"journal":{"name":"Turkish Journal of Aquatic Sciences","volume":"33 1","pages":"181-193"},"PeriodicalIF":0.0,"publicationDate":"2021-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75004566","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The Probiotics, Lactobacillus Acidophilus and Saccharomyces cerevisiae in Diets of Clarias gariepinus Improve Feed Utilization and Growth 饲料中添加益生菌、嗜酸乳杆菌和酿酒酵母菌，提高了加里宾Clarias gariepinus饲料利用和生长

Turkish Journal of Aquatic Sciences Pub Date : 2021-04-16 DOI: 10.4314/JAS.V35I2.22

U. Enyidi

{"title":"The Probiotics, Lactobacillus Acidophilus and Saccharomyces cerevisiae in Diets of Clarias gariepinus Improve Feed Utilization and Growth","authors":"U. Enyidi","doi":"10.4314/JAS.V35I2.22","DOIUrl":"https://doi.org/10.4314/JAS.V35I2.22","url":null,"abstract":"The study evaluated effects of incorporating different proportions of probiotics, Lactobacillus acidophilus (LAC) and Saccharomyces cerevisiae (SAC) in diets of Clarias gariepinus for improved growth and feed utilization. Six isonitrogenous (34% protein) diets were compounded with varying probiotic inclusion ratios (LAC: SAC) as followed: F1 (0:25%); F2 (25:0%); F3 (15:10%); F4 (10:15%); F5 (5:20%) and F6 (12.5:12.5%). The diets were mixed, preconditioned and steam pelleted at 100oC. Fish (average weight 35.16 ± 2.32g) were stocked at 15 fish per 80-liter aquarium tank and fed the experimental diets ad libitum for 60 days. Results showed that catfish fed with F2 (25% LAC and 0% SAC) had the best feed conversion ratio of 1.72±0.04, specific growth rate, 5.00±0.24 %/day, average weight gain 19.13±0.04g, final weight 56.46±0.08g and protein efficiency ratio of 0.59±0.02. Fish fed F1 (25% SAC and 0% LAC) achieved about half the growth and nutritional parameters of those fed diet F2. Growth performance increased with increasing inclusion level of LAC. However, fish fed F6 had a better specific growth rate than other mixtures except for those in F2 group. It could be inferred that reduced inclusion of SAC seemed beneficial to catfish. \u0000Keywords: Probiotics, lactic acid bacteria, yeast, gut microbiome, African catfish","PeriodicalId":32064,"journal":{"name":"Turkish Journal of Aquatic Sciences","volume":"3 1","pages":"195-207"},"PeriodicalIF":0.0,"publicationDate":"2021-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79053015","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Influence of Socio-Economic Factors on the Profitability of Fish Farming in Owerri North Local Government Area of Imo State 社会经济因素对伊莫州奥韦里北部地方政府区养鱼盈利能力的影响

Turkish Journal of Aquatic Sciences Pub Date : 2021-04-16 DOI: 10.4314/JAS.V35I2.24

J. Ukagwu, S. Ohaturuonye, C. Dan-Uchegbu, U. Nkulo, J. O. Ohakwen

{"title":"Influence of Socio-Economic Factors on the Profitability of Fish Farming in Owerri North Local Government Area of Imo State","authors":"J. Ukagwu, S. Ohaturuonye, C. Dan-Uchegbu, U. Nkulo, J. O. Ohakwen","doi":"10.4314/JAS.V35I2.24","DOIUrl":"https://doi.org/10.4314/JAS.V35I2.24","url":null,"abstract":"The study was carried out to examine the influence of socio-economic characteristics on profitability of fish farmers in Owerri North LGA of Imo State. The study considered cost incurred and returns accrued on fish production in the area. Also, the relationship between the revenue derived from fish farming and various factors affecting fish production were determined. Standard procedures were adopted in all experimental analyses. One hundred and ten (110) fish farmers were randomly selected within the study area and used for the work, and data were collected using a well-structured questionnaire. Collected data were analysed using descriptive statistics such as percentages and inferential statistics (multiple regression at p<0.05) as well as cost and return analysis. Results showed that average annual income of a fish farmer was ₦6,269,886 while the profitability index was 1.89. Thus, indicating that, for every one-naira (₦1.00) investment made in fish farming in Owerri North LGA, ₦1.89 was returned to the farmer as net income. The study further showed that sex and years of farming experience were statistically significant and positively correlated (R2=0.8570; p<0.05) with net farm returns. On the other hand, age of the farmer, education attainment and marital status were negatively correlated and not significant. It is therefore recommended that people should engage in fish farming in the area as it is a profitable venture. \u0000Keywords: Cost, returns, socio-economic factors, fish farming, Owerri North","PeriodicalId":32064,"journal":{"name":"Turkish Journal of Aquatic Sciences","volume":"39 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80352620","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Growth Performance of Clarias gariepinus Juveniles fed Diets Supplemented with Garlic (Allium sativum) Powder 饲料中添加大蒜(Allium satium)粉对Clarias gariepinus幼鱼生长性能的影响

Turkish Journal of Aquatic Sciences Pub Date : 2021-04-16 DOI: 10.4314/JAS.V35I2.18

K. Elezuo, E. Okeke, V. Olarewaju, B. Quadri

{"title":"Growth Performance of Clarias gariepinus Juveniles fed Diets Supplemented with Garlic (Allium sativum) Powder","authors":"K. Elezuo, E. Okeke, V. Olarewaju, B. Quadri","doi":"10.4314/JAS.V35I2.18","DOIUrl":"https://doi.org/10.4314/JAS.V35I2.18","url":null,"abstract":"The study investigated effects of graded levels of garlic (Allium sativum) powder supplemented diets on the growth performance of Clarias gariepinus juveniles. Five treatments comprising of twelve C. gariepinus juveniles of mean weight 7.52±0.00g per treatment were used in the study. Fish in each treatment was fed twice daily with experimental diets formulated with different inclusion levels of garlic powder at 0%, 1%, 2%, 3% and 4%; designated as control, T1, T2, T3 and T4 respectively. Fish were fed at 5% of their body weight and feeding trial lasted for 56 days. Analysis of the physico-chemical parameters of culture water was also carried out. Collected data were analysed and results showed that water temperature ranged from 27.0 to 28.5oC, pH ranged between 7.58 and 7.79, dissolved oxygen levels varied from 6.20 to 6.50mg/l, while ammonia content was observed to be between 2.33 and 2.73mg/l. Fish fed 3% garlic inclusion diet had the highest mean weight gain (MWG) of 40.63±30.04g, percentage weight gain (PWG) of 541.73% and specific growth rate (SGR) of 2.79±0.00%/day when compared with those on other treatments. The least PWG (345.25%) and SGR (1.95±0.00) were observed in the control and fish fed 1% garlic inclusion diets. However, MWG values were similar (p > 0.05) in T1 and T4. Fish fed diets with 2% garlic inclusion had the highest FCR (3.22±0.04) while the least value (2.29±0.03) was observed in T3. Results of the crude protein contents of treated fish carcass increased in all dietary treatments. Inference from this study indicated that incorporation of garlic meal in fish diets at 3% inclusion level improved growth performance and proximate composition of C. gariepinus juveniles. \u0000Keywords: Catfish, functional foods, garlic, nutrient utilization, weight gain","PeriodicalId":32064,"journal":{"name":"Turkish Journal of Aquatic Sciences","volume":"29 1","pages":"157-164"},"PeriodicalIF":0.0,"publicationDate":"2021-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89465096","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Physical Properties and Water Stability of Wheat and Cassava flour Binders for Fish Feed Formulation 鱼饲料用小麦和木薯粉粘合剂的物理性能和水稳定性

Turkish Journal of Aquatic Sciences Pub Date : 2021-04-16 DOI: 10.4314/JAS.V35I2.23

P. C. Onuoha, G. Ugwumadu, D. Chinonyerem, K. P. Okpala-Ezennia, K. A. Ogbuagu

{"title":"Physical Properties and Water Stability of Wheat and Cassava flour Binders for Fish Feed Formulation","authors":"P. C. Onuoha, G. Ugwumadu, D. Chinonyerem, K. P. Okpala-Ezennia, K. A. Ogbuagu","doi":"10.4314/JAS.V35I2.23","DOIUrl":"https://doi.org/10.4314/JAS.V35I2.23","url":null,"abstract":"The experiment assessed the binding effects and some physical properties of wheat and cassava flour binders used in fish feed formulation. Three diets were formulated using cassava, wheat and a combination of cassava and wheat flours in a ratio of 1:1 as binders. These diets were designated as Treatments 1, 2 and 3 respectively. The physical properties evaluated were pellet-ability and dustiness. Water stability test included: weight gain, sinking time/rate, relative absorption rate and absorption efficiency rate. The results showed that all treatments produced high binding potential. There were no significant differences (p>0.05) in pellet-ability amongst the treatments, with values of 99.86±0.25%, 99.62±0.19% and 98.76±0.59% for Treatments 3, 2 and 1 respectively. Dustiness showed a significant difference (p<0.05) amongst the treatments. Treatment 3 recorded a low value of 0.64% which was significantly difference (p<0.05) from Treatments 1 and 2 while Treatment 2 had the highest value of 1.00%. The water stability test showed that Treatment 3 had the best sinking time rate of 4.33±0.04sec and sinking time index of 0.23±0.00sec-1 which were significantly different (p<0.05) from the other treatments. There were no significant differences (p>0.05) between Treatments 2 and 3 in water stability test, but they were both significantly different (p<0.05) from Treatment 1. Treatment 3 had the best water stability value of 92.04% and Treatment 1 the least with a value of 80.28%. The binders proved to be more effective when used in combination. \u0000Keywords: Leaching, fish feed, fish farming, binders, eutrophication","PeriodicalId":32064,"journal":{"name":"Turkish Journal of Aquatic Sciences","volume":"906 1","pages":"209-218"},"PeriodicalIF":0.0,"publicationDate":"2021-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74429955","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effects of Curcuma longa on Growth and Biochemical Variables of Oreochromis niloticus Challenged with a Consortium of Bacteria 姜黄对细菌联合攻毒的尼罗褐虾生长及生化指标的影响

Turkish Journal of Aquatic Sciences Pub Date : 2021-04-16 DOI: 10.4314/JAS.V35I2.25

U. I. Enyidi, C. Orji

{"title":"Effects of Curcuma longa on Growth and Biochemical Variables of Oreochromis niloticus Challenged with a Consortium of Bacteria","authors":"U. I. Enyidi, C. Orji","doi":"10.4314/JAS.V35I2.25","DOIUrl":"https://doi.org/10.4314/JAS.V35I2.25","url":null,"abstract":"This study evaluated effects of turmeric on growth and immune response of Nile tilapia. Five phytogenic feeds were formulated with varying inclusion levels of turmeric thus: F1 20 %/kg; F2 15 %/kg; F3 10 %/kg; F4 % g/kg and F5 0 %/kg. There was a commercial feed (F6) which served as the control experiment. Fish fingerlings (initial weight ca. 14.2g) were fed experimental diets for 70 days, thereafter, they were subjected to dual bacterial challenge by injecting a consortium of Staphylococcus aureus, Pseudomonas aeruginosa and Flavobacterium columnare into the culture media and then intraperitoneal injection of the bacteria into the fish muscle. Growth, nutritional performances and immunity of the fish were analyzed using standard procedure. Results showed that the relative protection levels of fish fed diets F1 to F3 were 100%, while 95.56% was obtained in group fed diet F4. A 0% mortality was recorded for fish fed diets F1 to F3, 4.4 % for those fed diet F4 and 100% for those fed diets F5 and F6. The best specific growth rate was recorded in fish fed diet F1 with the values decreasing with decrease inclusion levels of turmeric in diets. Alanine aminotransferase and aspartate aminotransferase reduced with the inclusion of turmeric. Results showed that increasing turmeric inclusion up to 20% in tilapia diet would increase growth rate and enhance immunity against bacterial diseases. \u0000Keywords: Turmeric, phytogenic feed, O. niloticus, bacterial challenge, aquatic microbes","PeriodicalId":32064,"journal":{"name":"Turkish Journal of Aquatic Sciences","volume":"6 1","pages":"229-244"},"PeriodicalIF":0.0,"publicationDate":"2021-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79761330","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Economic Evaluation of Three Hormonal Preparations in Artificial Propagation of Heterobranchus longifilis (Valenciennes, 1840) 三种激素制剂在长尾异枝人工繁殖中的经济评价(valciennes, 1840)

Turkish Journal of Aquatic Sciences Pub Date : 2021-04-16 DOI: 10.4314/JAS.V35I2.20

P. Asangusung, A. Uka, A. Otoh

{"title":"Economic Evaluation of Three Hormonal Preparations in Artificial Propagation of Heterobranchus longifilis (Valenciennes, 1840)","authors":"P. Asangusung, A. Uka, A. Otoh","doi":"10.4314/JAS.V35I2.20","DOIUrl":"https://doi.org/10.4314/JAS.V35I2.20","url":null,"abstract":"The economic evaluation of three hormonal preparations: ovaprim, ovulin and carp pituitary extract (C.P.E) in artificial propagation of Heterobranchus longifilis was investigated. A total of twelve brood fishes (nine females and three males) of eighteen months old were used for the experiment. The females were divided into three groups. Each group was induced to spawn with each of the hormones. Pooled sperm from the three males were used to fertilize the eggs obtained from the females. Effects of the hormones on the fecundity was investigated to help address the economic values. The results showed that the cost of inducing 1.20kg female to yield 42.83g, 57.60g, and 35.10g of eggs were ₦480.39, ₦225.00 and ₦175.00, for C.P.E, ovaprim and ovulin respectively. Profitability index for ovaprim, ovulin, and C.P.E was 5.58, 3.44, and 3.92, respectively. Indicating that, cost of production accounted <20% for Ovaprim and <30% for both ovulin and C.P.E of the total variable cost. The production was more profitable with ovaprim than ovulin and C.P.E. The study has provided data, comparing the effectiveness of the hormones, revealing that the three hormones can be used for artificial propagation of H. longifilis with varied degree of economic implication. However, ovaprim is highly recommended to hatchery users for optimum performance. \u0000Keywords: H. longifilis, ovaprim, ovulin, C.P.E and economic evaluation.","PeriodicalId":32064,"journal":{"name":"Turkish Journal of Aquatic Sciences","volume":"56 1","pages":"173-179"},"PeriodicalIF":0.0,"publicationDate":"2021-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78161747","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Assessment of Heavy Metal Distribution in Tilapia (Oreochromis niloticus) Samples from Uta Ewa Creek, Niger Delta, Nigeria 尼日利亚尼日尔三角洲Uta Ewa河罗非鱼样品中重金属分布的评价

Turkish Journal of Aquatic Sciences Pub Date : 2021-04-13 DOI: 10.4314/JAS.V35I2.16

N. Abiaobo, I. E. Asuquo, I. Ejiogu

{"title":"Assessment of Heavy Metal Distribution in Tilapia (Oreochromis niloticus) Samples from Uta Ewa Creek, Niger Delta, Nigeria","authors":"N. Abiaobo, I. E. Asuquo, I. Ejiogu","doi":"10.4314/JAS.V35I2.16","DOIUrl":"https://doi.org/10.4314/JAS.V35I2.16","url":null,"abstract":"The Uta-Ewa Creek is one of the largest aquatic commercial hubs in the Niger Delta, Nigeria. As a result of household activities, urbanization as well as the continuous industrial and agricultural growth, the health of this aquatic system is potentially deteriorating and under threat. This study was conducted to determine trace metal toxicity in tilapia species caught along the creek. Heavy metal concentration in fish tissue was analyzed using standard procedure. Results revealed that concentration of cadmium ranged from 1.708 to 1.963 mg/kg (mean = 1.82 ± 0.099 mg/kg), chromium: 0.003 to 0.016 mg/kg (mean = 0.0 ± 0.005 mg/kg), copper: 1.829 to 2.558 mg/kg (mean = 2.27 ± 0.354 mg/kg), iron: 2.104 to 2.601mg/kg (mean = 2.38 ± 0.189 mg/kg), lead: 0.004 to 0.067 mg/kg (mean = 0.04 ± 0.024 mg/kg), manganese: 1.987 to 2.485 mg/kg (mean = 2.21 ± 0.188 mg/kg) and zinc: 1.019 to 2.986 mg/kg (mean = 1.69 ± 0.811 mg/kg). The average heavy metal accumulation in fish tissue followed this sequence: Fe>Cu> Zn>Mn>Cd>Cr>Pb.The depth of accumulation of heavy metals revealed in this study was higher than the recommended levels by WHO, FEPA and USEPA. This indicated bioaccumulation. Inference from this study showed that, tilapia fish from Uta-Ewa Creek may be unsafe for human consumption. Consequently, appropriate monitoring of the health of this aquatic system is recommended. \u0000Keywords: Heavy metals, bioaccumulation, concentration, monitoring, pollution","PeriodicalId":32064,"journal":{"name":"Turkish Journal of Aquatic Sciences","volume":"1 1","pages":"139-147"},"PeriodicalIF":0.0,"publicationDate":"2021-04-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87753199","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0