Reproductive biology of a Gobiid fish Oxyurichthys tentacularis (Valenciennes, 1837) inhabiting Ashtamudi Lake, S. India

Abstract

Reproductive traits of Oxyurichthys tentacularis, a most demanded fish in Ashtamudi Lake, S. India were studied from samples collected using gill net, cast net and dip net during 2013–2015. Sexes were separated by observing the urogenital papilla in males and the gonads. Five maturity stages were identified by examining the gonads. Though advanced maturity stages were encountered throughout the year, higher preponderance of ripe gonads was discernible during August to November and February to April. Gonadosomatic indices indicated same trend in both sexes. The length at first maturity was 86.67 mm in males and 80.17 mm in females. The absolute fecundity ranged from 5,112 (102 mm TL) to 52,431(175 mm TL). Fecundity established linear relationships with total length, body weight and ovary weight. Ova diameter studies revealed that spawning takes place in batches at regular intervals and the species is a multiple spawner. The ratio of males to females was found to be 1:0.7 (χ2 = 10.8; p < 0.05). The pooled average for the whole period showed a perceptible dominance of male population in all of the months except in January (χ2 = 2.3; p > 0.05) could be observed.

Sex ratio and reproduction of invasive red devil, (Amphilophus labiatus: Cichlidae) in Lake Sentani, Indonesia

“…The fecundity of various species has been described in many studies as being linear as an allometric function of standard/total length and body weight (Ahamed, Saha, Ahmed, & Hossain, 2018;Barzotto & Mateus, 2016;Mohan, Harikrishnan, & Williams, 2018). There is also a linear relationship between gonad mass (Barzotto & Mateus, 2016) and ovary weight (Mohan et al, 2018). Similarly, the present study also indicated a greater body length and weight correlate well with the higher fecundity of A. labiatus in Lake Sentani.…”

“…labiatus and its sympatric species (A. citrinellus) from other places in Indonesia (Adjie et al, 2011;Tampubolon et al, 2015). The fecundity of various species has been described in many studies as being linear as an allometric function of standard/total length and body weight (Ahamed, Saha, Ahmed, & Hossain, 2018;Barzotto & Mateus, 2016;Mohan, Harikrishnan, & Williams, 2018). There is also a linear relationship between gonad mass (Barzotto & Mateus, 2016) and ovary weight (Mohan et al, 2018).…”

“…Gonad maturation index fluctuations and partly non-parallel maturation of gonads in the population can result in an extended spawning season (Mohan et al, 2018). The Yakonde and Ayapo sites in the lake illustrated the highest GSI for males and females and were also the locations where the most males and females with ripe gonads were also found.…”

Morphological characteristics of sex dimorphism in Gobiopterus sp. (Gobiiformes: Oxudercidae) from Ranu Grati Lake, Pasuruan District, East Java, Indonesia

“…The level of gonad maturity can be used as an estimate of the reproductive status of fish. It is not yet known for certain the technical nature of sex change, but it is estimated from the size of male fish which is larger than female fish (Remya Mohan et al 2018).…”

Length at Maturity, Sex Ratio, and Proportions of Maturity of the Giant Electric Ray, Narcine entemedor, in Its Septentrional Distribution

“…This comparison suggested that the data set was distributed around the model, covering all the size classes. Whether this condition was observed or not could have caused misspecifications in the models, providing bias in estimates with evident poor fit [ 31 , 32 , 33 ].…”