You are in the accessibility menu

Please use this identifier to cite or link to this item:
Sex-specific compensatory growth in food-deprived Nile tilapia
Universidade Estadual Paulista (UNESP)
Female Nile tilapia incubate fertilized eggs in their mouth until they are released as alevins. Consequently, the female may not eat during this period. Thus, it would be expected that female Nile tilapia are more adapted to recovering from fasting than males, which do not display this behavior. To test this hypothesis we conducted an experiment with two groups of fish consisting of 7 males and 7 females each, with one fish per aquarium. The experiment was divided into three phases involving adjustment of the animals to experimental aquaria (0-15th day), fasting (16th-27th day), and refeeding (27th-42nd day). Compensatory growth performance was assessed by specific growth rate, weight, food conversion efficiency and food intake. Food conversion efficiency increased after fasting with a similar rate for both sexes. However, specific growth rate, food intake and weight gain (%) were significantly higher in males than in females in the refeeding phase. Thus, we conclude that male Nile tilapia can compensate for a fasting period more efficiently than females, refuting our hypothesis. A possible mechanism involved in the greater male compensation is that they presented greater hyperphagia than females, concomitantly with a similar rate of food conversion efficiency for both sexes during refeeding, which would probably be provoking greater growth in males.
Issue Date: 
Brazilian Journal of Medical and Biological Research. Associação Brasileira de Divulgação Científica, v. 36, n. 4, p. 477-483, 2003.
Time Duration: 
Associação Brasileira de Divulgação Científica (ABRADIC)
  • Compensatory growth
  • Fasting
  • Sex-related growth
  • Mouthbrooding fish
  • Nile tilapia
  • Oreochromis niloticus
Access Rights: 
Acesso aberto
Appears in Collections:Artigos, TCCs, Teses e Dissertações da Unesp

There are no files associated with this item.

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