Comparison of the digestibility of diets based on fish meal and soybean meal in Litopenaeus Vannamei Boone 1931, using different temperatures and salinities for culture

H Cabanillas-Beltrán,Jt Ponce-Palafox,Ca Martínez-Palacios,Lg Ross,Mc Chávez-Sánchez

doi:10.7773/cm.v27i4.499

Abstract

The digestibility of fish meal and soybean meal by Litopenaeus vannamei was determined at different temperatures (22ºC and 28ºC) and salinities (16‰ and 35‰) using practical diets based on ingredients available in Mexico. The digestibility of soybean meal was consistently higher compared to that of fish meal, in terms of the apparent digestibilities of dry matter, crude protein and aminoacids, suggesting that soybean meal proteins are more readily digested. For fish meal, the apparent digestibility of the dry matter was reduced by high salinity at 28ºC, and the carbohydrate apparent digestibility was reduced by high salinity at both temperatures. The high salinity also reduced the digestibility of dry-matter, lipids and carbohydrates in soybean meal at 28°C, but had no effect on crude protein digestibility. This may have implications for the role of carbohydrates as source of energy in practical diets for shrimp. The results also suggest that the fish meal used might have been of reduced quality.

Highlights

Aquaculture production, especially that of carnivorous fishes and crustaceans, depends completely on the use of fish meal and fish oil as main sources of proteins and lipids
Salinity, pH, ammonia, nitrite and nitrate levels in the experimental systems during the studies are shown in table 3
Nitrogen-free extract is higher in soybean meal while energy is similar in both diets

Summary

Introduction

Aquaculture production, especially that of carnivorous fishes and crustaceans, depends completely on the use of fish meal and fish oil as main sources of proteins and lipids. There is a tendency to reduce this dependence through the use of other sources or alternatives with equal or similar nutritional quality, but lower cost (Tacon, 1997). The accurate measurement of nutrient digestion and assimilation efficiency of the INTRODUCCIÓN. Hoy en día existe la tendencia a reducir ésta dependencia mediante el uso de otros recursos o fuentes alternativas de proteínas y lípidos, con igual o similar calidad nutritiva, pero de más bajo costo (Tacon, 1997). Several researchers have derived feed digestibilities or assimilation efficiencies from growth experimental data (Fenucci et al, 1982; Bordner et al, 1983; Smith et al, 1985). The digestive enzyme analysis is yet another analytical tool that has been used to evaluate digestion in marine crustaceans (Lee et al, 1984; Lan and Pan 1993; Ezquerra et al, 1998)

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Conclusion