Reproductive Ecology of Mola (<i>Amblypharyngodon mola</i>)

Abstract

Reproductive cycle of mola (Amblypharyngodon mola) in a pond and in a beel along with some aspects of their physico-chemical parameters, morphometry etc. were carried out at Rajshahi. The highest (81.08%) average monthly percentage of ovigenous female Mola in pond was in September and lowest (20%) in November, whereas the highest (87.30%) and the lowest (28.57%) values in beel were found in May and in November respectively. Both the Gonado Somatic Index (GSI) and Gonadal Langth Index (GLI) of Mola showed two distinct peaks, one in May and another in September where GSI values were 19.51% and 22.48% and GLI values were 36.31% and 36.19% respectively. Similar peaks were found in the beel where GSI values were 20.98% and 18.72% and GLI values were 41.77% and 40.58% respectively. The lowest mean fecundity of Mola in pond was 1023±625 and the highest was 6806±125 in size groups of 5.0-5.5cm and 8.1-8.5cm respectively. Ova diameter of Mola in pond showed two distinct peaks one in May and another in September where Ova diameter values were 30?m and 29?m respectively. Similar peaks were found in beel where OD values were 28?m and 27 ?m respectively. Above result shows that Mola (A. mola) breeds twice a year with one peak in May and another in September in both pond and beel. Some ecological parameters were also observed in the study areas.

DOI: http://dx.doi.org/10.3329/jard.v6i1.1674

J Agric Rural Dev 6(1&2), 165-174, June 2008