Size at Sexual Maturity of the Female Pool Barb, Puntius sophore (Cyprinidae) in the Old Brahmaputra River, North Eastern Bangladesh

Abstract

The size at sexual maturity of the female Puntius sophore was estimated in the Old Brahmaputra river, North eastern Bangladesh, using direct observation of sexual characters (e.g., gonadosomatic index) and by the indirect way using relative growth. Monthly samples were collected using a combination of fine-meshed cast nets and seine nets. All specimens were sexed and Standard Length (SL), Fork Length (FL), Body Weight (BW) and Gonadal Weight (GW) of all female individuals was measured. The gonadosomatic index (GSI) was calculated as GSI = (GW/BW×100). The size at sexual maturity was estimated by the relationships of SL-GSI and SL-FL. The estimated size at sexual maturity of female P. sophore was 4.2 cm standard length based on the relationship between standard length and gonadosomatic index. On the other hand, relative growth of fork length to standard length showed a transition point at sizes 4 cm standard length, indicating size at sexual maturity of female P. sophore. This study presents information on the size at sexual maturity of female P. sophore, which will be useful for the management and conservation of this important fishery in Bangladesh and neighboring countries.

Fish fauna of the Brahmaputra River, Bangladesh: richness, threats and conservation needs

“…The Brahmaputra River, originates in the Chemayung-Dung glacier, is one of the largest rivers in the world; with its basin covering areas in China, India and Bangladesh (Ahmed 2015). The total length of the river from its source in southwestern Tibet to the mouth in the Bay of Bengal is about 2,850 km; including Padma and Meghna rivers up to the mouth (Ahmed 2015).…”

“…The total length of the river from its source in southwestern Tibet to the mouth in the Bay of Bengal is about 2,850 km; including Padma and Meghna rivers up to the mouth (Ahmed 2015). Inside Bangladesh territory, BrahmaputraJamuna is 276 km long, of which Brahmaputra is only 69 km (Ahmed 2015).…”

Fish fauna of the Brahmaputra River, Bangladesh: richness, threats and conservation needs

“…The Brahmaputra River, originates in the Chemayung-Dung glacier, is one of the largest rivers in the world; with its basin covering areas in China, India and Bangladesh (Ahmed 2015). The total length of the river from its source in southwestern Tibet to the mouth in the Bay of Bengal is about 2,850 km; including Padma and Meghna rivers up to the mouth (Ahmed 2015). Inside Bangladesh territory, Brahmaputra-Jamuna is 276 km long, of which Brahmaputra is only 69 km (Ahmed 2015).…”

“…The total length of the river from its source in southwestern Tibet to the mouth in the Bay of Bengal is about 2,850 km; including Padma and Meghna rivers up to the mouth (Ahmed 2015). Inside Bangladesh territory, Brahmaputra-Jamuna is 276 km long, of which Brahmaputra is only 69 km (Ahmed 2015).…”

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

“…Size at sexual maturity is widely used as an indicator for minimum permissible capture size, and is very crucial for fisheries management (Ahamed & Ohtomi, ; Ahamed, Ahmed, Hossain, & Ohtomi, ; Hossain et al, ; Lucifora, Valero, & Garcia, ). In the present study, the size at sexual maturity of A. bato was estimated as 4.9 cm SL on the basis of SL‐GSI and SL‐DI relationships.…”