Journal of Ecology and The Natural Environment
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Article Number - 166F4C32483


Vol.1(1), pp. 007-014 , April 2009

ISSN: 2006-9847



Full Length Research Paper

A preliminary study on the response of mangrove mud crab (Scylla serrata) to different feed types under drive-in cage culture system


David Mirera1* and Abdhallah Mtile2




1Silvofisheries Organization, P. O. Box 98422-80100, Mombasa, Kenya.

2Kwetu Training Centre, P. O. Box 685-80109, Mtwapa, Kenya.


Email: dimirera@yahoo.com






 Accepted: 08 April 2009  Published: 30 April 2009

Copyright © 2009 Author(s) retain the copyright of this article.
This article is published under the terms of the Creative Commons Attribution License 4.0


The populations in coastal areas in east Africa have increased dramatically in the last decades, resulting in increased pressure on coastal resources. The examples are declining fish catches, deteriorating conditions of coral reefs and reduction of mangroves forests. The objective of the study was to asses the potential of grow-out Aquac of mud crabs Scylla serrata, as an alternative livelihood for resource-poor coastal communities. Growth rate and survival of mud crabs (S. serrata) cultured in individual drive-in cages (30 x 30 x 30 cm) located in the mangrove forests dominated by Rhizophora mucronata were evaluated. The effect of feed (Terebralia pallustris - gastropod meat, fish offal and mixture of the 2) was determined in a completely randomised design. Feeding was done at 10% body weight at incoming tide throughout the experimental period of 120 days. Monthly sampling was employed and total weight (g), cheliped length (cm), carapace length (cm) and width (cm) were measured. The study aimed at establishing the growth rate, moulting and mortality of crabs fed using locally available feeds. A total of 180 drive-in cages were used for the experiment giving 60 replicates for each treatment. Drive-in cages were built with "fitos" and grouped in sets of 10 for easy management. Crab seed stock of 50 - 380 g for the experiment were bought from artisanal fishermen application of ANOVA and post-hoc test revealed that crabs fed with mixed feed had significantly higher % growth (47.9%) compared to fish offal (33.4%) but were similar to gastropod meat (43.2%) p < 0.05. Growth rate was significantly affected by feed type, where higher values were recorded in mixed feed diets (gastropod meat and fish offal, 1.29 g/day) compared to the individual feeds (0.96 and 0.97 g/day for fish offal and gastropods meat respectively. There was no significant difference in growth of monosex crabs female (0.996 - 1.55 g/day) and males (0.893 -1.01 g/day) p = 0.373.

 

Key words: Mangrove, mud crab, feed, drive-in cage, growth.


APA (2009). A preliminary study on the response of mangrove mud crab (Scylla serrata) to different feed types under drive-in cage culture system. Journal of Ecology and The Natural Environment, 1(1), 007-014.
Chicago David Mirera and Abdhallah Mtile. "A preliminary study on the response of mangrove mud crab (Scylla serrata) to different feed types under drive-in cage culture system." Journal of Ecology and The Natural Environment 1, no. 1 (2009): 007-014.
MLA David Mirera and Abdhallah Mtile. "A preliminary study on the response of mangrove mud crab (Scylla serrata) to different feed types under drive-in cage culture system." Journal of Ecology and The Natural Environment 1.1 (2009): 007-014.
   
DOI
URL http://academicjournals.org/journal/JENE/article-abstract/166F4C32483

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