Please use this identifier to cite or link to this item:
Title: Influence of dietary protein level on ovarian recrudescence in Nile tilapia, Oreochromis niloticus (L.)
Authors: Gunasekera, R.M. 
Lam, T.J. 
Keywords: Broodstock
Dietary protein
Issue Date: 1-Mar-1997
Source: Gunasekera, R.M., Lam, T.J. (1997-03-01). Influence of dietary protein level on ovarian recrudescence in Nile tilapia, Oreochromis niloticus (L.). Aquaculture 149 (1-2) : 57-69. ScholarBank@NUS Repository.
Abstract: Ovarian recrudescence was investigated in Nile tilapia, reared on isocaloric, semi-purified diets of 10, 20 and 35% protein content, for 2 and 4 month periods. Females immediately after spawning were used with a view to ensuring that all individuals investigated would have ova in a regressed state initially, so that subsequent changes could be correlated to dietary protein affects. In females reared for 2 months, the dietary effects on ovarian recrudescence became most evident only by Day 14, when a significantly higher percentage of Stage 4 oocytes (diameter > 2.4 mm, pear-shaped, bright yellow, post vitellogenic oocytes) were present in the 35% protein fed females as compared to those fed the 10% protein diet. In females reared on the diets for 4 months, comparable differences were evident on Day 7 after spawning. Here ovarian recrudescence of 10% protein fed females was slower than in females maintained on 20 and 35% dietary protein levels. In females reared for 2 and 4 months on the experimental diets. GSI, however, did not vary significantly amongst fish fed 10, 20 and 35% diets, in the regressed and recrudescing ovaries at Day 7 and Day 14. There was evidence to indicate that even when the females are reared on a sub-optimal diet (e.g. 10% protein) they make an attempt to go through the recrudescence process, perhaps by utilizing existing body reserves.
Source Title: Aquaculture
ISSN: 00448486
DOI: 10.1016/S0044-8486(96)01441-X
Appears in Collections:Staff Publications

Show full item record
Files in This Item:
There are no files associated with this item.


checked on Mar 8, 2018


checked on Feb 13, 2018

Page view(s)

checked on Mar 12, 2018

Google ScholarTM



Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.