&lt;b&gt;Influence of rearing temperature on muscle growth and adipose tissue in Nile tilapia (&lt;i&gt;Oreochromis niloticus&lt;/i&gt;) strains

Rondinelle Artur Simões Salomão,Edson Assunção Mareco,Vander Bruno Dos Santos

doi:10.4025/actascianimsci.v40i0.35686

Abstract

This study aimed to evaluate the effect of temperature on the tissue growth of Red, GIFT and Supreme tilapia strains. Fingerlings of approximately 1.4 g from male populations were reared for a period of 60 days, in three recirculating systems, each system containing 6 water tanks of 0.5 m³, at three temperatures (22, 28 and 30ºC). Ten fish of each recirculation system and each temperature studied were sampled. Fishes have been anesthetized, euthanized and weighed. The samplings have been done from the dorsal musculature, caudal, visceral and ventral subcutaneous adipose tissue. Histological sections were prepared and evaluated to determine the diameter of the cells. The experimental design was completely randomized factorial 3 X 3 (strain X temperature). Analysis of variance was performed and means were compared. Higher weights were found for fish reared at 30°C (56.23 g) compared to those grown at 28 (42.12 g) or 22°C (10.52 g). The cooled water temperature (22°C) may have contributed to the hypertrophy of white muscle fibers and visceral adipocytes from tilapia, compared to 28 or 30ºC. Red Tilapia, GIFT and Supreme strains show differences in muscle growth and adipose tissues in response to temperature of cultivation.

Highlights

Tilapias are among the most important species of freshwater fish in tropical climate used for the production (Charo-Karisa et al, 2006)
The intensification of production systems has resulted in a rapid expansion in the cultivation of tilapia and new strains have been introduced in Brazil and worldwide
GIFT (Genetically Improved Farmed Tilapia) strain arrived in Brazil in 2005, from the World Fish

Summary

Introduction

Tilapias are among the most important species of freshwater fish in tropical climate used for the production (Charo-Karisa et al, 2006). The intensification of production systems has resulted in a rapid expansion in the cultivation of tilapia and new strains have been introduced in Brazil and worldwide. GIFT (Genetically Improved Farmed Tilapia) strain arrived in Brazil in 2005, from the World Fish. It is the largest fish breeding program conducted in the Philippines tilapia (Bentsen et al, 1998). Genomar Supreme TilapiaTM strain is the continuation of the GIFT program after a 10-year period, ending in 1998 (Gjoen, 2004), and has since become commercialized in Brazil. Several strains / hybrids of red tilapia have been developed commercially generating great acceptability by the market

Objectives

Methods

Results