Breeding Biology of Mola Carplet, (Amblypharyngodon mola, Hamilton, 1822) in Semi-Natural Condition

Subrata Mondal, Abdul Wahab, Benoy Kumar Barman and Abdulla- Al-Asif

Background and Objective: The mola carplet, Amblypharyngodon mola is a representative small indigenous fish species that is enriched with different vitamins and minerals. The main objective of this study was to determine the reproductive biology of A. mola for better scientific management and conservation in hapa based culture, set up in a large earthen pond. Materials and Methods: The experiment was conducted of three treatment with two replicates along hapa size varied treatment: T₁ (2 m³), treatment: T₂ (10 m³) and treatment: T₃ (20 m³) with two replicates each and the stocking density in those hapas were 50, 250 and 500g, respectively in April, 2012 to March, 2013. Some biological characteristics, gonad weight, Gonadosomatic Index (GSI) and condition factor (K) of both sexes were observed. Results: Cycle of gonadal maturation and month-wise variations were documented with their fecundity, size-frequency of intra-ovarian oocytes in females. Throughout the suitable physic-chemical parameters, monthly microscopic examination of gonad revealed five maturity stages of female A. mola but male showed same four stages. Ripe ova have been observed for nine consecutive months (April to December) which referring extended the breeding season. Considering the stocking density and hapa sizes, A. mola bred the highest frequency in T₃ during the culture period. Different size classes of intraovarian oocytes have portrayed the batch-wise (asynchronous) development of oocytes in A. mola throughout the culture period. Conclusion: This evidence suggests that A. mola has its inherent regulating mechanism of oocyte development adapted to the annual life of the fish, in spite of their single spawning habit, they discharge all oocytes in different batches throughout the spawning season.

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