Length‐weight relationship of six demersal fish species from Gulf of Mannar, Bay of Bengal, Eastern Indian Ocean

Abstract

Length‐weight relationship (LWR) parameters were analysed for six demersal finfish species from the Gulf of Mannar coast, Bay of Bengal. Fishes were sampled monthly from the landings of trawlers operated along the coast of Tuticorin and Rameshwaram with a cod‐end mesh size of 35 mm at the depth of 60–80 m. Fish specimens were sampled by measuring the total length (TL) and total weight (TW) with precision to 0.1 cm and 0.1 g respectively. The present study also recorded a new maximum total length for Engyprosopon macrolepis, Torquigener brevipinnis and Leiognathus brevirostris.

Age and growth of elephant-snout fish Mormyrus kannume (Forsskål, 1775) (Family: Mormyridae) from Lake Nasser, Egypt

“…The elephantfish in lake Nasser was studied via some aspects that needed for management and conservation as the current goals of all countries for biodiversity and sustanaible developments. The length-weight relationship in fish is affected by many factors such as season, habitat, maturity, sex, diet and annual variations in environmental conditions (Hossain et al, 2013;Karuppiah et al, 2021). Fish can attain either isometric or allometric growth (Gayanilo and Pauly 1997; Sarkar et al, 2013).…”

“…Length-weight relationships of fishes are among the most important biological parameters in combination with population and environmental parameters as it provides certain information for conservation of natural populations and fishery management (Hossain et al, 2013;Farrg et al, 2018;Mehana et al, 2018 andKaruppiah et al, 2021) and also plays a vital role in morphological comparison of different populations (Gonçalves et al, 1997 andKodeeswaran et al, 2020). The condition factor is the index used to understand maturity, the survival, health status, and reproduction of fish (Le Cren, 1951;Hossain, 2010;Ahmed et al, 2012), it indicates the quality of a water body and the overall fitness of a population residence in a specific ecosystem (Tsoumani et al, 2006;Sabbir et al, 2020).…”

An Experimental Trammel Net in the River Nile, Aswan, Egypt Influencing the Age and Growth of the Nile tilapia Oreochromis niloticus (Linnaeus, 1758)

“…The length-weight relationship is the most relevant aspect of population dynamics and stock assessment studies and in the development of strategies for sustainable fisheries management (Froese, 2006;Froese et al, 2011;Karuppiah et al, 2021). The condition factor is a useful index for estimating growth and assessing the environmental quality (Olopade and Tarawallie, 2014).…”

“…This led to the absence of a lower age group in the larger mesh size. The length-weight relationship in fish is an essential biological parameter, providing information useful for the conservation of natural populations and for fisheries management (Froese, 2006;Karuppiah et al, 2021). The slope ''b'' of the length-weight relationship is an indicator of the variation in fish condition and health (Le Cren, 1951;Ricker, 1975).…”