Sex-specific compensatory growth in food-deprived Nile tilapia.
Open Access
- 1 April 2003
- journal article
- Published by FapUNIFESP (SciELO) in Brazilian Journal of Medical and Biological Research
- Vol. 36 (4), 477-483
- https://doi.org/10.1590/s0100-879x2003000400009
Abstract
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.Keywords
This publication has 23 references indexed in Scilit:
- Effects of Starvation and Subsequent Refeeding on Formation and Resorption of Acellular Bone in Tilapia, Oreochromis niloticusZoological Science, 2001
- Compensatory growth in the gibel carp following feed deprivation: temporal patterns in growth, nutrient deposition, feed intake and body compositionJournal of Fish Biology, 2001
- Pattern of hyperphagia in immature three‐spined sticklebacks after short‐term food deprivationJournal of Fish Biology, 2000
- Individually reared female Nile tilapia (Oreochrornis niloticus) can grow faster than malesJournal of Applied Ichthyology, 1998
- Effect of restricted feeding regimens on compensatory weight gain and body tissue changes in channel catfish Ictalurus punctatus in pondsAquaculture, 1995
- Compensatory growth in Alaska yellowfin sole, Pleuronectes asper, following food deprivationJournal of Fish Biology, 1995
- The influence of previous feeding regime on the compensatory growth response of maturing and immature Arctic charr, Salvelinus alpinusJournal of Fish Biology, 1993
- Predictability of individual growth rates in tilapiaAquaculture, 1993
- Effects of methyltestosterone on food utilization and growth of Sarotherodon niloticus fry.NIPPON SUISAN GAKKAISHI, 1986
- COMPENSATORY GROWTH AFTER UNDERNUTRITION IN MAMMALS AND BIRDSBiological Reviews, 1960