Journal of The School of Marine Science and Technology,Vol.1 No.2
Research on the Effect of the Temperature for the Growth of Sergestid Shrimp
Shuhei OHNISHI
Abstract
Statistical analysis was attempted to examine the effect of water temperature on growth of the sergestid shrimp,Sergia lucens.The observed temperature was divided to ranks at interval of 0.5 degree.Optional unknown response functions were applied for each rank for defining the average length of shrimp.Nine models were proposed,based on an idea that weighted value of response function by occurrence of rank represents the average length. It is possible to estimate the response function by the Empirical Bayes Method.In order to specify the period where the temperature has significant effect on the growth,values of ABIC were compared among nine models with data sets differing in data months.Among data obtained during 1972 through 2001,the author selected those from 19 years which showed ordinary growth.Data applied for analysis consisted of average body length and daily water temperature from July to November.As a result,the model assigned to Aug.and Sept.temperature data was determined as the optimal.It also showed that the promotive effect on the growth of shrimps is concentrated on the condition between 24.5 and 25.0 degrees.The results obtained by statistical models support previous biological findings. Moreover, the restraint in growth seemingly due to separation from the optimal water temperature has different response between the warmer and colder conditions.
     
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