Morphometric and Meristic Characteristics of Paradise Threadfin (Polynemus paradiseus, Linnaeus 1758) in Sundarbans Estuary of Bangladesh

Abstract

Paradise threadfin a species from the Perciformes order and polynemidae family is one of the commercially important fishes in the south-west coastal region of Bangladesh. The study was conducted to know the morphometric and meristic characteristics of this fish species. A total 120 fish samples were collected from May 2021 to April 2022 ranging from 11.2-23.5 cm TL and 9.77-100.87 g BW. The fin formula was: D1: 7; D2: 14-16; P1: 15-16/VII; P2: 6-9; A: 14-15; C: 16-18. Off the LWRs equations, BW = 0.0028×FL3.55 was the well-expressed model depending on the largeness of the R2 value. The value of slope (b) ranging from 3.07 to 3.55 indicates a positive allometric growth pattern. The LLRs were highly correlated (R2≥0.917) and regression of TL vs FL, SL, and Pr2ndDL showed the best-fitted model among the 8 equations. The correlations among 45 different LLRs, 37 correlations showed a very high positive correlation (r = 0.91-0.99) whereas, eight LLRs exhibited a high positive correlation (r = 0.84-0.90). This study will support future studies for the management of P. paradiseus in the coastal regions and the mangrove adjacent rivers.