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April 14, 2014

East Africa

Mud Crab Growth Rates

 

From Abstract: Predicting growth is critical in aquaculture, but models of growth are largely missing for mud crab species.  In this study, researchers present the first model of natural growth in juvenile and adult mud crabs (Scylla serrata) from East Africa.  Their results show a sigmoid growth pattern in carapace width and suggest that S. serrata in East Africa will reach 300 grams and sexual maturity approximately 9.9 months after settlement and a commercial size of 500 grams after 12.4 months.  The researchers also show that growth rates of S. serrata cultured in cage systems (commonly used in East Africa) were less than 40% of estimated natural growth rates and growth rates obtained in pond systems.  The analysis also indicated that growth rates of S. serrata in Southeast Asia were over 50% higher than in similar culture systems in East Africa—and that different species of mud crabs had large differences in growth rates.  This study shows that growth at mud crab farms in East Africa is below its potential.

 

Source: Aquaculture Research.  Stepwise Function of Natural Growth for Scylla Serrata in East Africa: a Valuable Tool for Assessing Growth of Mud Crabs in Aquaculture.  Per-Olav Moksnes (email per.moksnes@bioenv.gu.se, Department of Biology and Environmental Sciences, University of Gothenburg, Box 461, SE-405 30 Göteborg, Sweden), David Oersted Mirera, Emma Björkvik, Muumin Iddi Hamad, Humphrey Matalu Mahudi, Daniel Nyqvist, Narriman Jiddawi and Max Troell.  Early View, Published Before Inclusion in Journal.  First Published Online, April 12, 2014.

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