Impact of the timing of stocking on growth and allometric index in aquaculture-based fisheries |
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| Authors: | A L Ibáñez |
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| Institution: | Universidad Autónoma Metropolitana-Iztapalapa, D.F. México |
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| Abstract: | The impact of tilapia stocking on fisheries production in Lake Metztitlán was determined through progression analysis of modes obtained from (Gaussian) kernel density estimators (KDEs) of size frequency distributions of juvenile tilapia stocked after a period of total desiccation. The relationship between the allometric index of four cohorts and water temperature and variation in the volume of the basin was analysed. The use of KDEs was found to be a useful technique for the recognition and progression analysis of modes. The reasons for the low yields from the tilapia fishery of Lake Metztitlán are poor growth rate, low water temperature, which is manifest in low allometric indices, and the use of small mesh size nets. Yields can be sustained by improving fishery management; otherwise it is necessary to continue stocking. |
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| Keywords: | allometric index kernel density estimators Oreochromis spp stocking analysis |
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