International Journal of Pure & Applied Bioscience (IJPAB)
Year : 2016, Volume : 4, Issue : 2
First page : (9) Last page : (16)
Article doi: http://dx.doi.org/10.18782/2320-7051.2234
Impact of Artificial Feed on Survival and Growth of Rainbow Trout, Oncorhynchus mykiss (Walbaum) during Exogenous Feeding in Raceways of Kathmandu, Nepal
Rakesh Prasad Bhagat1,2 * and Sudip Barat2
1Department of Zoology, Tri-Chandra Multiple Campus, Tribhuvan University, Kathmandu-44600, Nepal
2Aquaculture and Limnology Research Unit, Department of Zoology, University of North Bengal, Siliguri-734013, District Darjeeling, West Bengal, India
*Corresponding Author E-mail: rakesh.bhagat2009@gmail.com
Received: 4.03.2016 | Revised: 11.03.2016 | Accepted: 15.03.2016
Abstract
Artificial feed including low cost, alternative, and nonconventional animal protein in replacement to costly shrimp meal were formulated and their impact on survival and growth of rainbow trout, Oncorhynchus mykiss (Walbaum), during exogenous feeding in raceways were compared. Three feed formulations of silkworm pupae (SWP), silkworm moth (SWM), and synthetic amino acids (SAA) were evaluated against shrimp meal (SML) acting as control through feed efficiency indicators. Four diets (three formulated and one control) were fed to the free swimming fries, fries, and fingerlings for 150 days (5 months). There was significant difference in survival (P<0.01) and growth (P<0.05) of above mentioned stages. Survivability with SML diet fed stages showed superiority (P<0.01) among other feed formulations, SWP came next, SWM less, and SAA least. Growth with SWP diet fed stages exhibited superiority (P<0.05) amongst all the diets and SAA lowest whereas SML and SWM lied in between. Therefore, absolute growth rate, specific growth rate, relative growth rate, and feed efficiency were highest due to SWP, higher due to SML, low due to SWM, and lowest due to SAA. However, condition factor was highest due to SWP, higher due to both SAA and SML, and lowest due to SWM. Unlike other feed indicators, feed conversion ratio exhibited highest due to SAA, higher due to SWM, low due to SML, and lowest due to SWP. The highest growth period was observed during April to May and lowest during December to January in all the diets. Cost analyses revealed SWM containing diet cheapest with low production cost, SWP cheaper with lowest, SAA cheap with highest, and SML costly with high production cost. The study confirmed natural protein SWP, SML, and SWM were superior to SAA. Results indicated cost effective SWP containing diet could be used as better alternative to completely replaced SML without compromising survival and growth.
Key words: Formulated artificial feed, survival and growth, rainbow trout, exogenous feeding, raceway
Full Text : PDF; Journal doi : http://dx.doi.org/10.18782
Cite this article: Bhagat, R.P. and Barat, S., Impact of Artificial Feed on Survival and Growth of Rainbow Trout, Oncorhynchus mykiss (Walbaum) during Exogenous Feeding in Raceways of Kathmandu, Nepal, Int. J. Pure App. Biosci. 4(2): 9-16 (2016). doi: http://dx.doi.org/10.18782/2320-7051.2234
