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Abstract
Growth trends and decomposition analysis of area, production and productivity of shrimp in the state of West Bengal were carried out for a period of 16 years from 2005-2006 to 2020-21 by splitting the production data into two sub-periods i.e. period I 2005-06 to 2012-13 and period II 2013-14 to 2020-21. The growth rates were calculated using exponential function while the instability in the production was worked out using coefficient of variation (CV) and Cuddy Della Valle’s Instability Index (CDVI). The change in output in terms of relative contribution of area and yield was estimated by using Minhas decomposition model. During the first sub period, the compound growth rate for the area (-6.38) of shrimp culture was found to be significantly negative (p<0.05) while production (14.55 per cent) and productivity (23.12 per cent) were positively significant. Whereas during second sub period, the growth rate of shrimp production (-57.54 per cent) was negative while area (5.54 per cent) and productivity (60.05 per cent) were insignificantly positive. However, the study revealed that the overall compound growth rate of area (1.52 per cent) and production (5.94 per cent) of shrimp in West Bengal for the entire study period from 2005-06 to 2020-21 were found positively insignificant. The maximum growth in productivity was observed during the sub period II (60.05%) followed by sub period I (23.12 per cent). The instability indices i.e. CV and CDVI were found low during all the periods in the case of area. Goodness of fit under cubic model proved as best fit among the parametric models fitted to the area, production and productivity of shrimp culture in the state of West Bengal. The area effect was found to be 100.31 per cent, whereas yield and interaction effect were 1.72 per cent and (-) 0.94 per cent respectively in the study period. Finally, the analysis emphasized that the decomposition analysis and area effect played key role in making differentiation in the shrimp production of West Bengal.