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Articles by Elias Rabson Chirwa
Total Records ( 1 ) for Elias Rabson Chirwa
  Gladson Chikorela , Elias Rabson Chirwa and Kumbukani Mzengereza
  Background and Objective: A study was conducted at the National Aquaculture Center in Malawi to find the optimal stocking density of Tilapia rendalli to improve its growth in a periphyton based pond system. Materials and Methods: Growth was evaluated using specific growth rate, survival rate, yield and condition factor. These parameters were estimated from bi-weekly measurements of body weight (g) and total length (cm). Environmental conditions were monitored daily for temperature, dissolved oxygen, pH and chlorophyll a. Results: Ranges for mean weight gain (% day1), specific growth rate (% body weight day1), average daily weight gain (g day1), survival rate (%) and yield (kg ha1 42 day1) were 1.6-2.11, 1.8-3.3, 0.03-0.12, 68-85 and 5.18-7.54, respectively. Fish stocked at low stocking density (2 fish m2) showed higher values than the fish stocked at higher stocking density (3 fish m2). Conclusion: Low fish stocking density (2 fish m2) is optimal for increased growth of Tilapia rendalli in a periphyton based aquaculture system.
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