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American Journal of Innovative Research & Applied Sciences
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  | ARTICLES | Am. J. innov. res. appl. sci. Volume 5,  Issue 1, Pages 53-61 (July 2017)
Research Article
 
American Journal of innovative
Research & Applied Sciences 
ISSN  2429-5396 (Online)
OCLC Number: 920041286
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| JULY | VOLUME 5 | N° 1 | 2017 |
Authors Contact
*Correspondant author and authors Copyright © 2017:

|  Saviour Isonguyoh Umanah 1 | and | God’swill Patrick Okure 2 |

Affiliation.

1. University of Uyo | Department of Fisheries and Aquatic Environmental Management | Uyo | Nigeria |  

2. University of Uyo | Department of Fisheries and Aquatic Environmental Management | Uyo | Nigeria |
This article is made freely available as part of this journal's Open Access: ID |   Saviour-ManuscriptRef.1-ajira180617 |
ABSTRACT

Background:
Fish often defend their food and territory just like other animals. These activities are inherent in the desire to eat and not be eaten and manifest as aggressive and cannibalistic behaviour. Cannibalism is the act of one individual of species devouring all or part of another individual of the same species as food and can be influenced by many factors. Triploidy is one of the biotechnological methods applied to enhance the production of Heterobranchus longifilis which involve chromosome manipulation. Objective: This study compared the rates of cannibalism in the diploid and triploid hatchlings of H. longifilis. Hatchlings of H. longifilis were produced from broodstock of mean weight 2.5±0.3kg. Materials and methods: Triploidy induction was achieved by cold shock of the eggs 5 minutes post fertilization at 5oC over 40 minutes period. Incubation of eggs and fry rearing followed standard protocol. Two experiments were conducted. In experiment 1, 100 healthy fry were randomly selected from the diploid and triploid sets each and cultured in a 40 litres vat for 14 days, with 4 replicates in each case. In the second experiment, 20 diploid and triploid fingerlings were respectively cultured for 84 days in separate 1 x 0.98 x 0.4m3 concrete tanks, with 4 replicates in each case. The fish were monitored for aggressive behaviour and cannibalism in both experiments. Weight and number of fingerlings were monitored every 2 weeks in the second experiment. The survival rates and growth performance were determined at the end of the experiment. Results: The results of both experiments showed that survival rates were similar in the diploid (45±6.455) and triploid (42.5±8.539) fish (p>0.05) for experiment 1. In experiment 2, the growth indices: specific growth rate (diploid, 2.8±0.70 and triploid, 2.63±0.14) and mean weight gain (diploid, 22.248±1.100 and triploid, 17.675±2.020) were also not significantly different (p>0.05) in both diploid and triploid fingerlings. Conclusion: It was concluded that the level of cannibalism in the diploid and triploid H. longifilis was the same.

Keywords: fry, fingerlings, eggs, survival rate, growth performance

COMPARATIVE STUDIES OF CANNIBALISM ON DIPLOID AND TRIPLOID AFRICAN CATFISH - Heterobranchus longifilis


   |  Saviour Isonguyoh Umanah | and | God’swill Patrick Okure  |
. Am. J. innov. res. appl. sci. 2017; 5(1):53-61.

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Abstract |