Length–weight relationship and growth performance of different life stages of hatchery‐produced magur,Clarias magur(Hamilton, 1822)

Abstract

Length–weight relationship (LWR) of 661 numbers of hatchery‐produced magur, Clarias magur of all the life stages such as hatchlings, fry, fingerlings, juveniles and adults, was studied. The LWR of all the life stages of magur was estimated and the equations are as follows, hatchlings W = 0.0052*L1.282 (r2 = 0.8784), fry W = 0.0088*L3.028 (r2 = 0.8113), fingerlings W = 0.0065*L3.226 (r2 = 0.8906), juveniles W = 0.0028*L3.420 (r2 = 0.8175) and adults W = 0.0017*L3.491 (r2 = 0.8310). A positive allometric growth (b > 3) was observed in all the life stages except hatchlings. The annual growth rate of magur was observed with the body length and weight of 24 ± 1 cm and 115 ± 17 g, respectively, under the commercial production system. This is the first kind of study that describes about the LWR and growth performance of all the life stages of hatchery‐produced C. magur catfish from hatchlings to adults under commercial production system. This study will be more useful to the hatchery managers and fish growers to optimize the resources and husbandry practices to improve the growth, survival, and biomass production.

Effect of Formulated Feed as a Subsitute for Live Feed on Growth Performances, Biochemical Composition and Digestive Enzyme Activities of Asian Stinging Catfish, Heteropneustes fossilis (Bloch, 1794) Larvae

“…In the present study, a negative allometric growth (b ˂ 3) was observed in all sorts of feed, indicating an elongated body shape of the fish with a lesser width (Froese, 2006). The b value reported in this study is similar to that reported previously from the same species (2.6 for males and 2.8 for females) (Mia, 1984) as well as from other catfishes, including C. batrachus (1.282) (Sahoo et al, 2019) and C. gariepinus (2.9 for female and 2.74 for male) (Yalcin et al, 2002). Among the four feeds tested in the present study, dry Tubifex produced a b value lower than the limit (2-4) (Tesch, 1971) suggesting inappropriate choice as an alternative to live foods.…”

Maternal size on reproductive performance, egg and larval quality in the endangered Asian catfish, Clarias magur

“…The domestication of fish species for commercial aquaculture is essential to the development of the industry. The Asian catfish, Clarias magur, is highly demanded in the markets of the Indian subcontinent, and it is considered to be an important alternative species for species diversification in India and other Asian countries (Areerat, 1987;Sahoo et al, ,2016Sahoo et al, , , 2019. C. magur has a great potential for species diversification projects due to the possibility for high-density rearing, since the catfish is an air-breathing species able to thrive in low dissolved oxygen environment, has therapeutic benefits, high nutritional profile made up of easily digestible proteins and high iron content in the muscle (Argungu et al, 2013;Debnath, 2011;Hossain et al, 2006).…”

“…The domestication of fish species for commercial aquaculture is essential to the development of the industry. The Asian catfish, Clarias magur , is highly demanded in the markets of the Indian subcontinent, and it is considered to be an important alternative species for species diversification in India and other Asian countries (Areerat, 1987; Sahoo et al, ,2016, 2019). C .…”