Reproductive biology ofApocryptes bato(Gobiidae) in the Payra River, southern Bangladesh

Abstract

The gobioid fish Apocryptes bato (Hamilton, 1822) is a species of mudskipper found in Bangladesh, India, and Myanmar. The reproductive biology of A. bato including sex ratio, size at sexual maturity, breeding season, fecundity, and condition factor was studied in the Payra River, southern Bangladesh during May 2016 to April 2017. A total of 1,028 specimens (303 males and 725 females) were collected. The overall sex ratio was significantly different from the expected value of 1:1 (male: female = 1:2.39, χ2 = 173.23, p < 0.05). Size at sexual maturity was estimated as 4.9 cm standard length. Monthly variations in gonadosomatic index indicate that the main breeding season is from May to December. There was a significant positive correlation of body length and body weight with fecundity. Fulton's condition factor varied in both sexes and was attributed to variations in GSI with maturity. Breeding season was significantly associated with rainfall, but not air temperature. Our findings should improve management and conservation of this fish in the Payra River and surrounding ecosystems.

Age, growth and reproductive traits of invasive gobyTaenioides cirratusin the Chaohu Lake, China

“…Commonly, fish spawning at the time when the environmental conditions are favorable for their larval survive (Sui, Yan, & Chen, ). For most freshwater fish, the breeding period often coincides with local rainfall as flood could increase the water dissolved oxygen and bring amount of organics from the terrestrial ecosystem (Ahamed et al, ; Liang, Sui, Chen, Jia, & He, ). The spawning period of T. cirratus was simultaneous with the main annual rainfall of the Chaohu Lake, where 71% rainfall occurred in spring and summer and 53% rainfall occurred from May to August (Zhang, ).…”

“…Commonly, fecundity is an important factor to determine the revival ability of a fish population (Ahamed et al, ). In our study, the fecundity of T. cirratus was high, with fecundity ranging from 967 ova to 5,114 ova and the relative fecundity ranging from 254 to 423 ova/g.…”

“…Commonly, fish spawning at the time when the environmental conditions are favorable for their larval survive (Sui, Yan, & Chen, 2012). For most freshwater fish, the breeding period often coincides with local rainfall as flood could increase the water dissolved oxygen and bring amount of organics from the terrestrial ecosystem (Ahamed et al, 2018;Liang, Sui, Chen, Jia, & He, 2014).…”

“…TL at first maturity was calculated as: TL 50 = −(ab) −1 . Samples with yolked eggs (female) or clearly distinguishable testes (male) were classified as mature (Ahamed, Saha, Ahmed, Hossain, & Ohtomi, 2018). All ovaries at late stage Ⅳ or early stage Ⅴ were stored in 5% neutralized formaldehyde solution for fecundity calculation.…”

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

“…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).…”