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Freshwater Crayfish 5(1): 315-323 (1983)

PEER REVIEWED    RESEARCH ARTICLE

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Effects of rice pesticides on Procambarus clarkii in a rice/crayfish pond model

Ekanem SB, Avault Jr. JW, Graves JB and Morris H  e-mail link

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Abstract

Crawfish were cultured in a 0.8 ha earthen pond flooded on 29 September 1978. Unharvested rice served as the energy source and cover. Peak vegetative biomass was 6710 kg ± 178 kg/ha (dry wt.). Decomposition was linearly related to time after flooding. Crawfish production was 1266 kg/ha (wet wt.). Crawfish distribution was significantly affected by water depth, vegetation density, pond area, and time after flooding. Interactions between the four factors presented a complex picture of changing crawfish distribution over time in relation to resource availability within the pond. We found that shallow water (0.6-0.8 m), dense vegetation (greater than 646 g/m2, dry wt.) and center areas had a higher mean yield of crawfish than did the deep water (0.8-1.2 m), light vegetation (less than 646 g/m2, dry wt.) and edge areas. Roughly 200 days after flooding, dist i net differences between preference for deep and shallow areas disappeared. A significant quadratic relationship between crawfish weight and time after flooding was found. The regression equation indicates that mean crawfish weight will begin to decline in March, half way through the trapping season. Feeding, to avoid stunting, should begin no later than mid-February.

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Ekanem SB, Avault Jr. JW, Graves JB and Morris H. (1983). Effects of rice pesticides on Procambarus clarkii in a rice/crayfish pond model. Freshwater Crayfish 5(1):315-323. doi: 10.5869/fc.1983.v5.315

 

 

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