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    Brood Rearing and Dose Optimisation for Induced Breeding of Raikor, Cirrhinus reba (Hamilton, 1822)
    (2023) Das, David Rintu; Rayhan, Shamım; Haque, Prof. Dr. Md. Rezoanul; Begum, Nasima; Hossaın, Mohammad Amzad; Pandit, Debasish
    An experiment on brood rearing and induced breeding of the near threatened fish species Raikor, Cirrhinus reba using the pituitary gland (PG), was conducted from March to August 2020 at the Floodplain Sub-station of Bangladesh Fisheries Research Institute, Santahar, Bogura. Broods were collected and reared in the ponds of the hatchery complex. The total length (cm), body weight (g), gonad weight (g), and gonado-somatic index (%) of this species were measured during the rearing period. To standardize the breeding technique, a total of 90 brood fish of C. reba were treated with different doses of PG, specifically, 2.0, 4.0, 6.0 mg/kg body weight for females and 1.0, 2.0, 3.0 mg/ kg body weight for males in different treatments, namely T1, T2, and T3 respectively. A significant difference (p<0.05) was observed in fecundity, ovulation (%), and the fertilization rate (%) among the treatments. Based on the results, T2 (4.0 mg/kg body weight for females, 2.0 mg/kg body weight for males) produced the most favorable results. The current observations could be applied to C. reba stimulated breeding for the advancement of hatchery formation. More research on the nursing, nurturing, and culture of the near- threatened C. reba at varied densities and feedings is necessary for their conservation and restoration.
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    Effect of Stocking Densities on Growth and Production Performance of Bheda (Nandus nandus) in Pond Aquaculture
    (2023) Haque, Prof. Dr. Md. Rezoanul; Das, David Rintu; Sarkar, Roman; Begum, Nasima; Pandit, Debasish; Jaman, Asma
    The current study's goal was to look at how stocking densities affected Bheda (Nandus nandus) growth and production over the course of a 120-day period. Three treatments were T 1 (20,000 fish ha -1 ), T 2 (30,000 fish ha -1 ), and T 3 (40,000 fish ha -1 ), each with three replicates. Those fishes were fed daily with commercial sinking feed and a live food mixture at 9-3% fish body weight up to harvest- ing. Temperature, dissolved oxygen, pH, and other water quality indicators were measured every two weeks, along with the growth performance of Bheda fish. T2 had the highest yield of Bheda (3439.08±207.31 kg ha -1 ), followed by T 3 (3422.78±224.42 kg ha -1 ), and T1 (3136.62±150.00 kg ha-1 ). The harvesting weight (g), individual weight gain (g), individual percent (%) weight gain (g), SGR (% per day), and survival rate (%) of fish were significantly higher (p<0.05) in T1 , followed by T2 and T3 , respectively, where combined production of fishes was significantly higher at T2 followed by T3 and T 1 . Net profit and benefit-cost ratio were significantly higher in T1 than T2 and T3 . Based on the re- sults of this experiment, it can be concluded that stocking density of Bheda fingerlings at the rate of 20,000 fish ha -1 in T 1 showed the highest production performance for profitable pond aquacul- ture. However, further research on the standardisation of stocking density with economic profitabil- ity of this fish at the on-station or on-farm level in ponds may be required before widespread dis- semination of this culture technology to farmers, particularly in Bangladesh and elsewhere.