Autoregressive technique in length growth modelling of two Indian major carp, Catla catla (Hamilton) and Labeo rohita (Hamilton), reared under two holding conditions |
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| Authors: | T K Basu B Bhattacharyya S K Sarkar S Ganguly C Medda |
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| Institution: | Biometry Research Unit, Indian Statistical Institute, Calcutta, India |
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| Abstract: | An autoregressive analysis was performed on data from an investigation of the velocity and acceleration of the day-to-day length increments of two Indian major carp, Catla catla (Hamilton) and Labeo rohita (Hamilton), hatched in artificial (Chinese-style hatchery) and semi-natural (improvised pits) holding conditions. The autoregressive model, which was capable of providing short- and long-term predictions, was tested in parallel with a time regressive model and an instantaneous growth rate model. The estimate simulating short-term predictions was found to describe the data more efficiently than the other estimates of the models. Product-moment correlations comparing the two holding systems revealed no source-specific variation of growth between the species. However, the significant length velocity correlation suggests that the artificial system has greater efficacy. |
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