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Effect of delayed initial feeding on growth and survival of Asian seabass Lates calcarifer.

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Title Effect of delayed initial feeding on growth and survival of Asian seabass Lates calcarifer.
Not Available
 
Creator M.Kailasam
A.R.Thirunavukkarasu
S.Selvaraj
P.Stalin
 
Subject Asian seabass
Lates calcarifer
Delayed feeding
Growth
Survival
 
Description Not Available
This study investigated the influence of delayed initial feeding on growth and survival of Asian sea bass Lates calcarifer larvae
under controlled conditions. Growth parameters were evaluated by assessing morphometric characteristics of the larvae. Two
experiments were conducted at different initial feeding time (48 h, 72 h, 96 h and 120 h) as follows: experiment 1 was conducted to
evaluate the morphometric characteristics (total length, head depth, body depth, eye diameter, gut height, musculature height, yolk
and oil globule volume) under different initial feeding time. Sea bass larvae initiated first feeding at 96 h and 120 h after hatching
have achieved comparatively lesser growth in total length and total weight than that of 48 h and 72 h. The morphometric
characteristics of 5 DPH larvae had significant differences between 48 h and 120 h initial feeding. Similarly, significant differences
were noticed between 48 h and 96 h initial feeding for all the morphometric characteristics except gut height. In 11 DPH larvae,
significant differences were observed only between 48 h and 96 h for all the morphometric characteristics and it was not significant
between 48 h and 72 initial feeding. It was also observed that the yolk absorption in sea bass larvae was completed by 96 h
irrespective of the differences in the initial feeding. Similarly, oil globule was completely utilized at 120 h after hatching. There was
no significant difference in the yolk volume and oil globule utilization of 1 DPH and 2 DPH larvae among different treatments. The
yolk volume of 3 DPH larvae initiated first feeding at 48 h (0.0122 ± 0.0008 mm3
) and 72 h (0.0110 ± 0.0008 mm3
) had significant
differences with yolk volume of larvae initiated first feeding at 96 h (0.0098 ± 0.0006 mm3
) and 120 h (0.0096 ± 0.0003 mm3
).
However, the oil globule of 4 DPH did not vary significantly between the treatments.
Experiment 2 was carried out to find out the impact of delayed initial feeding on the survival rate. Sea bass larvae were initiated
first feeding at 48 h, 72 h, 96 h and 120 h under different treatments and after 21 days rearing, survival rate was estimated. Survival
rate was higher when the sea bass larvae initiated initial feeding at 48 h (31.46%) when compared to 72 h (21.18%) and 96 h
(8.42%). Complete mortality was recorded on 9 DPH for the larvae initiated first feeding at 120 h. Significant differences were
observed between the treatments. The present study suggests that the first feeding of sea bass larvae must be initiated at 48 h for
yielding better growth and survival
Not Available
 
Date 2023-08-24T05:10:11Z
2023-08-24T05:10:11Z
2007-01-01
 
Type Journal
 
Identifier Not Available
Not Available
http://krishi.icar.gov.in/jspui/handle/123456789/80504
 
Language English
 
Relation Not Available;
 
Publisher Not Available