Abstract
The silurid butter catfish, Ompok bimaculatus (Bloch, 1794), is widely distributed in the plains and sub-mountain regions of India, but not enough is known about its reproductive potential is still insufficient. The present study evaluated the comparative reproductive potential (in terms of sex ratio, spawning season, body size at first gonadal maturity, gonadosomatic index, fecundity, egg dimension, egg weight etc.) of fish (n=1223) from six tropical tributaries of the Ganges basin during January 2011-December 2013. The females had relatively greater weight and length. The body size at 50% first gonadal maturity (L50%) ranged between 228-262mm in females and 198-247mm in males. The population has high and low fecundities. The correlations between absolute fecundity and total length, as well as between body weight and gonad weight, were significant (p<0.05) and positive in all the population.
Highlights
RESUMEN: Dinámica de la ecología reproductiva del pez Ompok bimaculatus (Siluriformes: Siluridae) en seis ríos tropicales de la cuenca del Ganges, India
The present study evaluated the comparative reproductive potential of fish (n=1223) from six tropical tributaries of the Ganges basin during January 2011-December 2013
The predominant occurrence of mature and ripe stages of female ovaries of O. bimaculatus from six different rivers during April to August indicated that O. bimaculatus has a prolonged spawning season, with individuals showing river wise variation in spawning months with a peak in June
Summary
RESUMEN: Dinámica de la ecología reproductiva del pez Ompok bimaculatus (Siluriformes: Siluridae) en seis ríos tropicales de la cuenca del Ganges, India. Este estudio evalua el potencial reproductivo comparativo (en términos de proporción de sexos, época de desove, tamaño del cuerpo a la primera madurez gonadal, índice gonadosomático, fecundidad, dimensión del huevo, peso de los huevos, etc.) de los peces muestreados (n=1223) de seis ríos tropicales de la cuenca del Ganges durante enero 2011 y diciembre 2013. Palabras clave: cuenca Ganges, tamaño del cuerpo a la primera madurez gonadal, Ompok bimaculatus, potencial reproductivo, proporción de sexos, época de desove. The freshwater butter catfish Ompok bimaculatus (Bloch, 1794), locally known as ‘Pabdha’, is an indigenous catfish belonging to the family Siluridae and order Siluriformes It is found in India, Pakistan, Bangladesh, Myanmar, Sri Lanka and Afghanistan (Talwar & Jhingaran, 1991). Information available on the reproductive biology of the tropical fish O. bimaculatus from Indian waters, from Ganges basin is scanty.
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