Effect of replacing fish meal by full fat soybean meal on growth performance, feed utilization and gastrointestinal enzymes in diets for African catfish Clarias gariepinus.

A A Abdel-Warith,N A Al-Asgah,E M Younis,S Mahboob

doi:10.1590/1519-6984.214763

A A Abdel-Warith, N A Al-Asgah + Show 2 more

Open Access

https://doi.org/10.1590/1519-6984.214763

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Abstract

Study aimed to evaluate the effect of replacing fish meal with different levels of full fat soybean meal (FFSBM) on growth and digestive enzyme activities in the stomach, Liver and intestine for Clarias gariepinus. Four diets (D1, D2, D3 and D4) were formulated with 0, 15, 20 and 20 g 100-1 protein + DL-methionine by alternating FFSBM with fish meal. The growth of C. gariepinus was found to be significantly decreased when FFSBM replacement increased. Final body weight was 89.69, 79.70, 70.82 and 68.29 g for fish fed on D1, D2, D3 and D4, respectively, with significant differences between treatments. Specific growth rate (SGR) ranged between 3.11 to 2.78%. Proteolytic activity was higher only with alkaline pHs, whereas only very low activity was shown with acidic. Results of liver showed approximately similar results at acid and alkaline. In contrast, higher proteolytic activity in the stomach was observed at acid pHs 3.0 and 4.0 μg tyrosine-1 minute-1 mg-1 protein) whereas lower values were observed at neutral pH 7.0 g tyrosine-1 minute-1 mg-1 protein for catfish fed on the experimental diets. Moreover, trypsin activity was higher for the stomach, followed by the intestine and liver. However, higher amount of amylase observed in the liver than intestine and stomach.

Highlights

Clarias gariepinus is an important species in fish culture sector related to its fertilization, high growth rate, tolerate of high stocking density, resistance to the commonBraz
The results obtained in this study show that plant ingredients used as a protein sources for example full fat soybean can be effective when replaced less than 50% of the fishmeal protein (LT94) in the diets for C. gariepinus
Catfish growth was slightly inferior with a diet containing about 15g/100g protein D2 but highly significant inferior in catfish fed 20g/100g protein and 20g/100g of total protein of FFSBM with additional of DL-methionine compared with fishmeal as the only protein source

Summary

Introduction

Clarias gariepinus is an important species in fish culture sector related to its fertilization, high growth rate, tolerate of high stocking density, resistance to the commonBraz. Some Anti-nutritional factors ANFs suppress the activities of specific enzymes, such as proteinase and amylase; many protein components, such as haemagglutinins and lectins, can react in specific ways with certain carbohydrates (Hendricks, 2002). Protease enzymes such as trypsin and chymotrypsin are very important for the digestibility operations in digestive system of fish. While some studies have focused their attention on the influence of different substitute plant proteins on fish growth and feed utilization, few have looked at how diet changes the activities of digestive enzymes) Xu et al (2012) and Zhao et al (2016)

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