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Effect of an organic acids blend on a slow release medium on catfish performance

Introduction

Catfish (Pangasiushy pothalamus) have become increasingly attractive for the food industry. Farmers are looking for the possibilities to increase the cat fish performance. The influence of acidifiers on the fish performance was tested in several studies. The use of acids was tested in tropical warm water species, like tilapia (Ramietal.,2005) and cat fish (Owen et al.2006).

Aim of the trial

This study was conducted to investigate the effect of a well balanced combination of organic acids (buffered mixture of formic and propionic acids) based on a sequential release medium (Biotronic® SE) in cat fish feed to improve the growth performance. Different inclusion levels were tested to determine best dosage for the application of the product.

Materials and methods

Location: Aquaculture Centre for Applied Nutrition (ACAN), Thailand.

  • 630 juvenile striped catfish (Pangassiushypothalamus) initial weight of 10±1g.
  • Nine tanks (500 l), at density 70 fish per tank
  • The fish were fed to near satiety 3 times daily
  • Three treatments with three replicates per treatment.
    (1) Control diet based on commercial diet (NC)
    (2) Control diet + 2 g acidifier/kg feed
    (3) Control diet + 4 g acidifier/kg feed
  • Experimental period: 63 d

Table 1: Effect of organic acids on performance parameters of cat fish

  NC Acidifier 2 g/kg feed Acidifier 4 g/kg feed
No. of fish
210
210
210
Initial body weight (IBW), g
9.7
9.8
9.8
Final body weight (FBW), g
59.9
61.2
61.6
Weight gain (WG) (d1-d63),g
50.1
51.4
51.8
Feed conversion rate(FCR)
0.89
0.85
0.86

Results and discussion

The fish under trial conditions achieved a very high performance during the entire period increasing their initial body weight by more than 500% in 9 weeks. The trial results showed the improvement in growth performance in the trial groups fed diets supplemented with acidifier compared to the control group (Table1). Fish fed diets supplemented with acidifier at 2 and 4g/kg feed inclusion rate showed an increase in weight gains of 2.53 and 3.28%, respectively (Table1). During the experimental period 100% survival rates in all three trial groups indicate high hygienic and production conditions. There was no significant difference found if compared with the negative control (P>0.05). Nevertheless, compared to the control group, the feed conversion rate (FCR) was slightly lower (0.85 and 0.86) in the groups fed diets supplemented with 2 and 4 g acidifier /kg feed, respectively. In the present study the FCR might be attributed firstly to the high quality of feed, and optimization of feeding rate under trial conditions.

Conclusion

In spite of excellent production conditions, diets supplemented with acidifier Biotronic® SE resulted inslight improved growth performance in cat fish. Dietary supplementation at inclusion rates 2 and 4g/kg feed showed increase in weight gainso f 2.53 and 3.28%, respectively. Decreased FCR compared to the control group was also achieved in the groups containing acidifiers.

For more information please visit www.biomin.net

Biomin - Feed additives, premixes and services for healthy and profitable farm animalsBIOMIN Holding GmbH
Erber Campus 1
3131 Getzersdorf, Austria
Biomin - Feed additives, premixes and services for healthy and profitable farm animals+43 2782 803 0
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