The present work reports the length–weight relationships(LWR)and condition factor relationships for Labeo calbasu collected from Upstream(Matyari)Kotri barrage at,River Indus,Pakistan,because stock assessment helps t...The present work reports the length–weight relationships(LWR)and condition factor relationships for Labeo calbasu collected from Upstream(Matyari)Kotri barrage at,River Indus,Pakistan,because stock assessment helps the fisheries managers to conserve the commercially important fish.Morphological characters of fish as well as Length-weight relationship are an important tool for fishery management.The results of LWR(W=aLb),for L calbasu.Representing negative allometric growth pattern.LWRs and condition factor relationships were found significantly correlated.A total of 200 and 190 specimens from upstream and downstream were collected,respectively.The assessed values of length-weight correlation and condition factor were calculated as Kn=39.663(LeCren),and K=11.915(Fulton)for upstream and Kn=44.066 and K=13.872 for downstream.Length-weight was found with a strong correlation of n=2.892,a=0.0235 with r2=0.934 for upstream population then the downstream population.The results of this work would be beneficial for sustainable management as well as fishery managers.展开更多
Objective:To conduct on sustainable fingerling production technique of endangered Labeo calbasu (Hamilton, 1822) (L. calbasu) based on different protein levels in ponds. Methods: The experiment was carried out under r...Objective:To conduct on sustainable fingerling production technique of endangered Labeo calbasu (Hamilton, 1822) (L. calbasu) based on different protein levels in ponds. Methods: The experiment was carried out under rearing pond in fish hatchery complex with three treatments group each having three replicates under department of fisheries, University of Rajshahi.L. calbasu were stocked at 41990/ha in T1, T2 and T3, respectively. The initial length ofL. calbasu in three treatments were (4.60 ± 0.10) cm and initial weights were (3.48 ± 0.01) g. Fishes were fed with 28%, 30%, 32% protein supplement for T1, T2, T3, respectively. The fishes were initially fed at 10% of body weight on 1st and 2nd fortnight. Then it was decreased at 8% of body weight on 3rd and 4th fortnight. Finally in 5th fortnight they were fed 5% of body weight. The physico-chemical characteristics of pond water were measured fortnightly. Results: The mean final weight gain was found highest in T3 (40.87 ± 0.01) g which was significant compared to T1 and T2. SGR (% bwd–1) was found 2.83 ± 0.02 (T1), 3.04 ± 0.01 (T2) and 3.39 ± 0.01 (T3). The highest survival rate ofL. calbasu was found in T3 (90.00 ± 1.00) and the lowest was found in T1 (87.00 ± 1.00). The best FCR (1.54 ± 0.01) was observed in T3 fed with 32% protein supplement. The highest production was observed in T3 (1672.20 ± 16.96 kg/ha/75 days) and lowest was observed in T1(1055.50 ± 29.04 kg/ha/75 days). The highest net benefit was calculated in T3 (260663.00 ± 4326.88 tk.) and lowest was found in T1 (112831.00 ± 7383.66 tk.). The CBR was found 0.60 ± 0.04, 0.80 ± 0.02 and 1.16 ± 0.02 in T1, T2 and T3, respectively. There were significant differences in CBR values among the three treatments. Conclutions:In this study, growth parametersi.e., weight gain, SGR (% bwd–1), length gain, total yield were significantly (P < 0.05) improved in T3 treatment fed with 32% protein supplemented diets.展开更多
基金The present work is partial work of M.Phil research scholar.
文摘The present work reports the length–weight relationships(LWR)and condition factor relationships for Labeo calbasu collected from Upstream(Matyari)Kotri barrage at,River Indus,Pakistan,because stock assessment helps the fisheries managers to conserve the commercially important fish.Morphological characters of fish as well as Length-weight relationship are an important tool for fishery management.The results of LWR(W=aLb),for L calbasu.Representing negative allometric growth pattern.LWRs and condition factor relationships were found significantly correlated.A total of 200 and 190 specimens from upstream and downstream were collected,respectively.The assessed values of length-weight correlation and condition factor were calculated as Kn=39.663(LeCren),and K=11.915(Fulton)for upstream and Kn=44.066 and K=13.872 for downstream.Length-weight was found with a strong correlation of n=2.892,a=0.0235 with r2=0.934 for upstream population then the downstream population.The results of this work would be beneficial for sustainable management as well as fishery managers.
文摘Objective:To conduct on sustainable fingerling production technique of endangered Labeo calbasu (Hamilton, 1822) (L. calbasu) based on different protein levels in ponds. Methods: The experiment was carried out under rearing pond in fish hatchery complex with three treatments group each having three replicates under department of fisheries, University of Rajshahi.L. calbasu were stocked at 41990/ha in T1, T2 and T3, respectively. The initial length ofL. calbasu in three treatments were (4.60 ± 0.10) cm and initial weights were (3.48 ± 0.01) g. Fishes were fed with 28%, 30%, 32% protein supplement for T1, T2, T3, respectively. The fishes were initially fed at 10% of body weight on 1st and 2nd fortnight. Then it was decreased at 8% of body weight on 3rd and 4th fortnight. Finally in 5th fortnight they were fed 5% of body weight. The physico-chemical characteristics of pond water were measured fortnightly. Results: The mean final weight gain was found highest in T3 (40.87 ± 0.01) g which was significant compared to T1 and T2. SGR (% bwd–1) was found 2.83 ± 0.02 (T1), 3.04 ± 0.01 (T2) and 3.39 ± 0.01 (T3). The highest survival rate ofL. calbasu was found in T3 (90.00 ± 1.00) and the lowest was found in T1 (87.00 ± 1.00). The best FCR (1.54 ± 0.01) was observed in T3 fed with 32% protein supplement. The highest production was observed in T3 (1672.20 ± 16.96 kg/ha/75 days) and lowest was observed in T1(1055.50 ± 29.04 kg/ha/75 days). The highest net benefit was calculated in T3 (260663.00 ± 4326.88 tk.) and lowest was found in T1 (112831.00 ± 7383.66 tk.). The CBR was found 0.60 ± 0.04, 0.80 ± 0.02 and 1.16 ± 0.02 in T1, T2 and T3, respectively. There were significant differences in CBR values among the three treatments. Conclutions:In this study, growth parametersi.e., weight gain, SGR (% bwd–1), length gain, total yield were significantly (P < 0.05) improved in T3 treatment fed with 32% protein supplemented diets.
