Induced breeding, embryonic and larval development of Macrognathus pancalus (Hamilton, 1822) under captive condition

The present study was carried out to enumerate induced breeding technique and larval development of Macrognathus pancalus (Hamilton, 1822) reared under captivity. Five different doses of Ovasis hormone (T1, T2, T3, T4, and T5) with 3 replicas each were administered to the matured brooders to standardize the breeding performance of the target species. The results indicated variation in fertilization rate, latency period, egg output and hatching rate in response to different treatments. Spawning was occurred between 20-24 hrs of injection in all the experiments at 26.33±0.88°C water temperature. Among all the experimental trials, the highest fertilization rate was observed in T3 (96.15±0.60) of E2 and the highest hatching rate was observed in T3 (92.49±1.00) of E2. The present work elucidated the viability of seed production of M. pancalus reared under confined condition which will useful for aquaculture and conservation

CAPTIVE BREEDING OF THE RECENTLY DISCOVERED SNAKEHEAD SPECIES Channa andrao BRITZ, 2013 BY HABITAT MANIPULATION

Captive breeding is considered as one of the most important aspects of the conservation of fish species. The breeding operation of many snakehead species is done using synthetic hormones, but no report is available on breeding by habitat manipulation without using hormones. Pairing among brooders is a common phenomenon in snakehead species. This article thus focuses on the captive breeding of Channa andrao following the pairing technique. Two pairs of brooders successfully bred in our experimental trial with the highest fertilization rate (85%) and hatching rate (86%) of fish of length-weight 10.33 cm and 11.05 cm in males and 11.23 g and 11.33 g in females. Suitable water parameters were maintained during the breeding period

Ecology and Diversity of Small Indigenous Fishes in Four Fishing Sites of Upper Brahmaputra Basin, Assam, India

Small Indigenous fishes constitute important fishery resource of Assam, but doesn’t finds its place in capture fishery. Collection of these species is chiefly from their wild habitat and thus the study of these habitats become very important. The four sites selected for study namely Bogibeel, Madhupur, Maguri Beel and Sessa are well known fishing sites of Upper Assam known to record higher fish catch. These sites harbour variety of small indigenous fishes for both food and ornamental value. In our study we have recorded 41 different species of fishes of which 13 belonged to Family Cyprinidae. Channa bleheri and Ailia coila were the two Near Threatened (NT) fish found during the study. Systematic studies of the habitat directly or indirectly like studying the gut content of fishes will give significant information