Effect of varying dietary protein levels on growth performance of pearlspot fry reared with and without substrates

Pankaj Amrut Patil; K. Ambasankar; Tanveer Hussain; Sagar  Khara; M  Kailasam; P. Mahalakshmi

doi:10.56093/ijans.v96i8.172238

Authors

Pankaj Amrut Patil Navsari-Gujarat Research Centre of ICAR-Central Institute of Brackishwater Aquaculture, Gujarat
K. Ambasankar ICAR-Central Institute of Brackishwater Aquaculture, Chennai
Tanveer Hussain Karwar Research Centre of ICAR-Central Marine Fisheries Research Institute, Karwar
Sagar Khara Navsari Gujarat Research Centre of ICAR-Central Institute of Brackishwater Aquaculture, Gujarat
M. Kailasam ICAR-Central Institute of Brackishwater Aquaculture, Chennai
P. Mahalakshmi ICAR-Central Institute of Brackishwater Aquaculture, Chennai

DOI:

https://doi.org/10.56093/ijans.v96i8.172238

Keywords:

Pearlspot, nursery, feed, crude protein, periphyton, growth

Abstract

In an aquatic environment, periphyton grows on various substratum and supports fish production. The periphyton based aquaculture technology is a low-cost eco-model with reduction in feed supplements and improving the environment. Pearlspot is an omnivorous slow-growing fish, feeding predominantly on filamentous algae. However, slow growth and high feed cost affect the fingerling production of pearlspot in nursery rearing. Hence, a 90 days study was undertaken to evaluate the effect of feeding different crude protein levels in pearlspot fry reared in hapas with and without periphyton substrate during the nursery phase. Pearlspot fry, with an average body weight (ABW) of 0.70 ± 0.02 g, were randomly stocked at a density of 200 individuals per hapa (2 × 2 × 1 m) in 21 hapas installed within a 2,500 m² pond. The experimental design was to evaluate the three levels of crude protein (30, 35 and 40%) with and without periphyton substrates against the control having only sugarcane bagasse without supplementation of feed. The experimental groups were fed with experimental feed @ 8-10 % body weight twice a day. After 90 days of experiment, fish highest mean weight was observed in T5 (24.15 ± 0.10 g), followed by T6 (22.90 ± 0.26 g), T4 (21.8 ± 0.19 g), T2 (18.3 ± 0.17 g), T3 (17.1 ± 0.17 g), and T1 (16.2 ± 0.26 g) and TC (9.50 ± 0.19 g), respectively. The results of the study revealed that growth parameters of pearlspot such as weight gain (g), feed conversion ratio (FCR), protein efficiency ratio (PER), and specific growth rate (SGR) were found significantly (p < 0.05) higher in feed treatments provided with sugarcane bagasse substrate in hapa (T₄, T₅& T₆) as compared to feed fed treatments (T₁, T₂, T₃) and control. The findings of the study suggest that floating feed containing 35% crude protein with the provision of periphyton substrate is ideal for commercial nursery culture of pearlspot fry in hapa (2 x 2 x 1 m) for obtaining higher benefits returns to fish farmers.

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