Effect of feeding management of broodstock on breeding performance of bata (Labeo bata)

Abstract

Abstract:Labeo bata is one of the important minor carps in Bangladesh with great demand as good table fish. The study was conducted to observe the breeding performance at different management practices in Mafatema, Rupali, Modhumoti and Anan fish hatchery and disinfection treatments of water, eggs and fry in Jessore, Bangladesh during 10 March 2014 to 15 May 2015. An improvement in broodstock nutrition and feeding has been shown to greatly improve seed production. Protein and lipid percentage of broodstock diet have been identified as major dietary factors. Protein level was 24.77%, 23.47%, 18.08%, 17.78% and lipid level was 11.07%, 9.50%, 7.74%, 8.14% in Mafatema, Rupali, Modhumoti and Anan fish hatchery respectively. Three concentrations of four chemical-formalin (10, 20, 30 mg/L), malachite green (1, 3, 5 mg/L), NaCl (1, 2, 3 g/L) and methylene blue ( 1, 3, 5 mg/L) treatment regimes and a control were compared for efficacy in treating L. bata eggs to prevent fungus and bacterial infection and improve hatch and survival rate of fry. Highest correlation value between absolute fecundity and body weight (r=.938, p<.05) and total length (r=.891, p<.05) and gonadosomatic index (26.2%) were found in Mafatema fish hatchery among four experimental hatcheries at 24.77% protein and 11.07% lipid level. Better fertilization rate (84.2±5.17%) and hatching rate (82.0±4.30%) were found in Mafatema and Rupali fish hatchery respectively that has significant difference (P<0.05) from that of Modhumoti and Anan fish hatchery at higher protein and lipid level. Lowest deformity rate (6.05+2.65) was observed in Mafatema fish hatchery that was significantly different (P<0.05) from that of Modhumoti fish hatchery. In case of disinfection treatment, methylene blue at 1mg/L bath treatment daily for 4 days showed significantly higher hatching rate (92.33±3.51%) and survival rate (94.33±4.73%).

Fry production and its marketing system of North-West fisheries extension project at Parbatipur, Dinajpur, Bangladesh

“…This resulted in an increased reliance on induced breeding for obtaining quality fish seed. Shabuj et al (2016);Hossain et al (2016);Islam et al (2016);Rahman et al (2015) and Ali et al (2015) did the same research on breeding and brood stock management, their result is more or less similar with the present study. Fish fingerlings were transported by using indigenous and modern techniques.…”

“…(2016); Islam et al (2016);Rahman et al (2015) and Ali et al (2015) did the same study on captive breeding. Their management and the present study is more or less similar with the present study.…”

Effects of stocking density on the growth rate of gold fish fry reared in hapa

“…The dings of the present study were more or less similar to Cooper (2006), who stated that water temperatures, ranged between 23°C and 29°C with a difference of 6°C. Ahmed et al (2016);Shabuj et al (2016);Rahman et al (2015); Ali et al (2016b) and Islam et al (2016) conducted similar study and results of temperature were more or less similar. Higher temperatures reduce the amount of oxygen content in the water, reducing the tank's stocking density.…”

“…Hossain et al (1999) and Kohinoor (2000) showed that dissolved oxygen concentration pond water varied from 3.8 to 6.9 mg/I, 2.04 to 5 mg/L and 3.50 to 7.50 mg/L for Indian major carps and punti, which was also more or less similar to the findings of the present study. Shabuj et al (2016); Rahman et al (2015); Ali et al (2016b); Ahmed et al (2016) and Islam et al (2016) conducted similar study and rate of dissolved oxygen level were more or less similar. In the present study, pH varied from 7.30 to 8.16 with the mean value of 7.60-1-0.17 which as also more or less similar to the findings of Cooper (2006).…”

Identification of Causative Agent for Fungal Infection and Effect of Disinfectants on Hatching and Survival Rate of Bata (Labeo. Bata) Larvae

“…When the bacterial count more than 1800x10 2 colonies ml -1 embryos and hatchlings mass mortalities were recorded. The enormous growth of bacteria on eggs shell result in accumulation of lactic acid hypoxia and death of fish eggs [27,28]. Beside excessive bacterial colonization may penetrate the egg shell or produce harmful toxic metabolites that could damage the chorion [8].…”