Case study on the crop rotation in a disease hit coastal tide-fed shrimp pond with silver pompano, trachinotus blochii (lacepede, 1801)

Joseph, Shoji and Imelda, Joseph and Ignatius, Boby and Anuraj, A (2022) Case study on the crop rotation in a disease hit coastal tide-fed shrimp pond with silver pompano, trachinotus blochii (lacepede, 1801). Journal of the Andaman Science Association, 27 (2). pp. 210-215. ISSN 0970-4183

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Abstract

Hatchery produced silver pompano, Trachinotus blochii were cultured in a typical tide fed coastal pond of 1 ha area, semi-intensive culture of tiger shrimp Penaeus monodonwas practiced for many years. Owing to two consecutive collapse of shrimp culture due to white spot disease, a crop rotation in the same pond with culture of hatchery produced T. blochii was performed sequentially after harvest of diseased hit P. monodon stock. Nursery rearing of hatchery produced T. blochii carried out in hapa in same pond resulted in a survival of 99.91 %. Growth performance of T. blochii and the water quality parameters were monitored monthly over a period of 5 months. Feeding was done with artificial floating pellet feeds with a protein of 45% @ 5-7 % of the body weight twice a day. The fishes reached an average weight of 248.30 ± 0.28 g and average length of 22.82 ± 0.90 cm from 9.65 ± 0.59 g and 5.20 ± 0.24 cm respectively upon harvest after 150 days with a survival of 90%.The absolute growth rate and specific growth rate obtained in the present study was 1.6 g day-1 and 2.2 % day-1 respectively. The results of the study revealed that T.blochii is an ideal species for culture in the low salinity traditional coastal tide fed ponds of Kerala. The study also demonstrates the advantage of crop rotation with fish than continuous culture of shrimp in the shrimp culture ponds and the suitability of culturing. T.blochii in polyculture with fish and shrimps.

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