Effects of Dietary Supplements on Growth Performance and Phosphorus Waste Production of Australian Catfish, Tandanus Tandanus, Fed with Diets Containing Canola Meal as Fishmeal Replacement

Huy Pv Huynh,Dayanthi Nugegoda

doi:10.4172/2155-9546.1000117

Abstract

Effects of dietary phytase, amino acid (AA), and inorganic phosphorus (P) in canola meal diets on the growth and P waste production of Australian catfish, Tandanus tandanus were evaluated. Fishmeal protein was replaced by 30% and 45% with canola meal protein in two separate experiments, in which test diets were fortified with phytase, AA, inorganic P, or their combinations. Addition of sole phytase to the 30% replacement diets did improve growth performance and feed utilization of fish compared to those fed with the non-phytase diet. Inclusion of phytase and/ or AAs did not improve the growth and feed utilization of catfish when fishmeal protein was replaced by 45% while adding inorganic P showed significant improvement in the performance of the fish. Ortho-P waste was significantly lower while total P waste was significantly higher in fish fed with canola meal diets at both levels of fishmeal replacement. Phytase did not affect the total P waste of catfish but a combination of phytase and AA resulted in a significant reduction. Dietary inclusion of inorganic P significantly elevated the total P waste of catfish compared to that of the control fish. It was concluded that the use of canola meal in combination with inorganic P in diets for Australian catfish could significantly increase nutrient pollution in aquaculture.

Highlights

Canola meal (CM) is an alternative protein source for fish meal (FM) similar to soybean meal (SBM) in diets for many aquaculture species
Substitution of FM by CM has been widely investigated for many fish species, including Chinook Salmon, Oncorhynchus tshawytscha [2,3,4], Atlantic salmon, Salmo salar L. [5], red sea bream, Pagrus auratus [6], rainbow trout, Oncorhynchus mykiss [1,7,8], tilapia, Oreochromis mossambicus [9], silver perch,Bidyanus bidyanus [10], sunshine bass, Morone chrysops x M. saxatilis [11], turbot, Psetta maxima [1] and channel catfish, Ictalurus punctatus [12,13]
30% of FM protein could be replaced with CM in diet of catfish, with no detrimental effects on growth and nutrient utilization, when 1000 FTU/kg feed was supplemented

Summary

Introduction

Canola meal (CM) is an alternative protein source for fish meal (FM) similar to soybean meal (SBM) in diets for many aquaculture species. CM has been incorporated in diets for shrimp, such as white shrimp,Penaeus vannamei [14] and blue shrimp, Litopenaeus stylirostris [15] Results from those studies have showed large variations, which were usually attributed to the nutritional quality of the ingredient when derived from different sources [10,16,17,18,19,20,21]. Previous studies revealed that replacing FM with plant protein sources, including soybean meal, reduced phosphorus (P) waste of different fish species, such as Japanese seabass, Lateolabrax japonicus [22], rainbow trout, Oncorhynchus mykiss [23,24], salmonid species [25]. Since a major fraction of P in CM is bound with phytic acid [27,28], and P digestibility of CM is poor for monogastric animals, including fish [29,30], the use of CM could potentially lead to water pollution due to the excretion of undigested P

Methods

Results

Discussion

Conclusion