M. Bouderbela, F. Chahrour, S. Dermeche, K. Boukhelf
{"title":"Comparative study of the metallic contamination assessment of a Paracentrotus lividus (lmck, 1816) macrobenthic community in Algerian west coast","authors":"M. Bouderbela, F. Chahrour, S. Dermeche, K. Boukhelf","doi":"10.31248/GJFS2019.009","DOIUrl":"https://doi.org/10.31248/GJFS2019.009","url":null,"abstract":"This study assesses the characteristics of the metallic trace elements (Fe, Cd, Cu, Pb and Zn) in the Paracentrotus lividus gonads. The physiological indices evolution (RIm and GIm) was adopted in order to determine the laying period of this echinoid; and to support the hypothesis that this species may be considered as an excellent bioindicator in the marine environment. For this purpose, two edible sea urchin populations with a diameter between 41 and 71 mm were sampled. This samples were taken from two different sites, Salamandre area (presence of rocky seabed rich of photophilic algae, with less biodiversity), and Sidi Lakhdarin area (presence photophilic algae and Posidonia oceanica, more biodiversity). Each sample was evaluated by the coupled plasma mass spectrometry (ICP-MS) method. The results obtained show that there is a significant variation (p<0.005) of physiological indices (RIm and GIm) over time. Besides, an important spawning increase is observed during spring and autumn. The results revealed that gonads metallic contaminations were present in all samples, with very heterogeneous concentrations. Also, it demonstrates that the metallic contamination existed in all seasons, with a clear demarcation of zinc and iron. The zinc quantity is 2.159 mg/l in Sidi Lakhdar and 1.413 mg/l in Salamandre; and the iron quantity is 2.088 mg/l in Sidi Lakhdar and 1.888 mg/l in Salamandre. Unlike zinc and iron, copper and cadmium have small amounts in the two sites. In the autumn, the cadmium quantity is 0.005 mg/l in the two sites; and the copper quantity is 0.068 mg/l in Sidi Lakhdar and 0.065 mg/l in Salamandre. Consequently, this marine species accumulates large quantities of these toxic metals according to the bioavailability of the pollutant in the surrounding environment.","PeriodicalId":136379,"journal":{"name":"Global Journal of Fisheries Science","volume":"101 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125200374","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}
A. F. Bankole, O. Adeosun, M. Adeyinka, I. Ogunwande
{"title":"Investigation of price fluctuation in retail fish species marketing in Ibadan, Oyo State","authors":"A. F. Bankole, O. Adeosun, M. Adeyinka, I. Ogunwande","doi":"10.31248/GJFS2018.004","DOIUrl":"https://doi.org/10.31248/GJFS2018.004","url":null,"abstract":"This study investigated price fluctuation in retail fish marketing in Ibadan metropolis for two years. A total of 120 respondents were interviewed in the study and primary data was used through questionnaires with interview. Data obtained were analyzed using descriptive statistics and regression model. The questionnaires were distributed randomly in ten selected markets chosen cut across five local governments in Ibadan metropolis. The descriptive statistics showed that 95.0 percent of the fish sellers were women and 5.0 percent were male. The respondents were married, 9.2 percent had no formal education, 30 percent had primary education, and 14.2 percent had secondary education while 4 percent had tertiary education. Also, about 65.8 percent of the respondents were with 1 to 10 years experience in fish marketing while 3 to 4% had 21 to 30 years of fish marketing experience. Double-log model was found to be the lead equation among the four models fitted. The model indicated a relationship between the determinants of fish price fluctuation in retail fish marketed (Y) and some explanatory variables which include trading experience (X1), Education level (X2), Average stocks (X3), hoarding quantity (X4), government daily tax rate (X5), and fuel price (X6). All these were found to be significant at 1 percent level. The elasticity of all variables determining fish price fluctuation was less than one. This means that they were inelastic. Thus, a unit increases in the trading experience lead to N0.1974 decrease in fluctuation of price of fish between the two years. Also, a unit increase in the quality of stock hoarded lead on the average of N0.3078 unit increase in the fluctuation in price within two years. Some of the major problems faced by fish retailers in the study area include: problem of middlemen, storage facilities, erratic power supply and government rate/tax.","PeriodicalId":136379,"journal":{"name":"Global Journal of Fisheries Science","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116692942","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}
O. Ogunyomi, O. Adam, S. G. Odu-Onikosi, O. Babalola
{"title":"Effects of replacing soya bean meal with fermented African locust bean (Parkia biglobosa) meal on the growth performance and condition factor of Tilapia zilli fingerlings","authors":"O. Ogunyomi, O. Adam, S. G. Odu-Onikosi, O. Babalola","doi":"10.31248/GJFS2019.005","DOIUrl":"https://doi.org/10.31248/GJFS2019.005","url":null,"abstract":"The study was conducted to evaluate the performance characteristics of Tilapia zilli fingerlings fed with locust bean meal as a replacement for soya bean meal in the diet. Two hundred and ten (210) heterogeneous sexes of Tilapia zilli fingerlings with mean weight of 15.24±0.01g were reared for 84 days in five rectangular glass tanks measuring 0.9 m x 0.45 m x 0.45 m and partitioned into three replicates with 14 fingerlings in each replicate. Five experimental diets were formulated at 0% (soya bean meal only), 25%, 50%, 75% and 100 % locust bean meal inclusion levels at T1, T2, T3, T4, and T5 respectively. Results showed that there were no significant differences (p>0.05) among the treatments as compared to mean weight gained, feed intake, feed conversion ratio, specific growth rate, protein efficiency, mortality/survival rate. Fish fed 100% locust bean meal showed the best growth performance in body weight gain, food conversion ratio and specific growth rate (SGR) but with poor condition factor and high mortality rate (54.76%). The study indicated that fermented African locust bean meal could be included in the diets of Tilapia zilli at 50% inclusion level from the view point of low mortality rate and final condition factor over other treatments. African locust bean meal could also be recommended for food security management purposes in replacing soya bean meal in order to reduce conflict that could emanates from the wide range of usage for other dietary purposes.","PeriodicalId":136379,"journal":{"name":"Global Journal of Fisheries Science","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114580137","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}
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