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Effect of stocking density on shooter formation, growth and survival of Asian seabass Lates calcarifer (Bloch, 1790) during nursery rearing

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Title Effect of stocking density on shooter formation, growth and survival of Asian seabass Lates calcarifer (Bloch, 1790) during nursery rearing
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Creator H. G. Solanki
M. A. K. Sumara
J. G. Vanza
M. Kailasam
P. Mahalakshmi
, Prem Kumar
C. Gopal
N. C. Ujjania
 
Subject Cannibalism, Differential growth, Formulated feed, Nursery feed, Shooters, Stocking density, Survival rate
 
Description Not Available
SeabassLates calcarifer is an important brackishwater fish, which thrives and farmed in fresh and saline water environment. Differential growth of this species during larval and nursery rearing phases leads to the formation of shooters, which reduces overall survival due to cannibalism. Therefore, the present experiment was conducted to evaluate the effect of stocking density on shooter formation, growth and survival of seabass. Hatchery produced seabass seed (total mean length 1.76±0.39 cm; mean weight 0.132±0.10 g) were stocked in net cage hapa (2x1x1 m) installed in brackishwater pond, at four different stocking densities, viz., T1 (800 nos.), T2 (850 nos.), T3 (900 nos.) and T4 (950 nos.) in triplicates. During the 45 days of nursery raising, fishes were fed with formulated nursery feed (crude protein: 42% and lipid 8%) at 5 to 8% of body weight three times a day. Initially, the fishes were manually graded on 3rd day and later on weekly basis and transferred to separate hapa. Total number of shooters formed during grading periods (S1, S2, S3, S4 and S5) were counted. It was observed that though maximum shooters were obtained from treatment T1 and minimum in treatment T3, the shooter formation among different treatments were not significantly different. The maximum numbers of shooters were obtained during the period from 9 to 21 days of rearing in nurseries in all the treatments. A survival of 60% was recorded during the present study. Based on the results of this study, it is suggested to maintain stocking densities of 400-425 m-2 for nursery rearing in hapa. Also, the rearing period from 9 to 21 days is significantly critical for ensuring good survival rate.
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Date 2024-02-28T20:20:46Z
2024-02-28T20:20:46Z
2023-12-01
 
Type Journal
 
Identifier Not Available
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http://krishi.icar.gov.in/jspui/handle/123456789/81524
 
Language English
 
Relation Not Available;
 
Publisher Indian Journal of Fisheries