Growth pattern of the Hooghly Croaker Panna heterolepis Trewavas, 1977 in the Bay of Bengal (Bangladesh) in relation to eco-climatic factors

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Abstract

The present study investigated the length-frequency (LFDs) distributions, length-length (LLRs) relationships and growth pattern based on length-weight (LWRs) relationships related to eco-climatic factors of Panna heterolepis captured from the Bay of Bengal, Bangladesh. In total, 1223 specimens (male = 654, female = 569) were collected from January to December 2019. Total length (TL), as well as body weight (BW), was measured by measuring board and digital balance with 0.01 cm and 0.01 g accuracy, respectively. TL varied between 10.70-31.40 cm for males and 10.50-34.50 cm for females. The overall allometric co-efficient (b) value for both sexes indicated negative allometric growth (< 3.00) for most of the months. In addition, the LLR (TL vs. SL) were extremely correlated (p < 0.001), with all r2 ≥ 0.982. The b of LWR was found significantly related to temperature for both sexes. However, rainfall, DO and pH did not reveal any significant correlation with the growth pattern for both sexes. This study recorded the maximum size of females as 34.5 cm TL. The outcomes of the study will be helpful for stock assessment as well as management of this fish in the Bay of Bengal, considering their response to climatic change.

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