The present study reports length-weight relationships (LWRs) and Fulton’s condition factor (K) of five marine finfish species [(Siganus vermiculatus (Valenciennes, 1835), Kathala axillaris (Cuvier, 1830), Exocoetus volitans, Linnaeus, 1758, Chaetodon collare Bloch, 1787 and Boleophthalmus dussumieri Valenciennes, 1837)] from Parangipettai (East coast, Tamil Nadu) and Mumbai (West coast, Maharashtra) of India. A total of 1451 specimens representing five fin fish species were collected monthly from January 2018 to December 2018 and the sex ratio were calculated. Based on the estimates of total length (TL) and body weight (BW), the growth parameters (b), sex-specific differences in growth parameter and their monthly variation were calculated. The sex ratio was female-biased and significantly different from 1:1 in all species except E. volitans. The value of parameter ‘b’ of LWRs varied from 2.734 to 3.201 (r² > 0.96 and P < 0.0001 for all species) and fall within the expected value of 2.5 to 3.5. The value of parameter ‘b’ for E. volitans and B. dussumieri did not fall within the 95% confidence intervals of Bayesian predictions. However for S. vermiculatus, C. collare, and K. axillaris the value of parameter ‘b’ was within the range of Bayesian predictions. Monthly variation in the value of parameter ‘b’ of the LWRs for all species was noticeable. The sample size had no effect on the ‘b’ value. Sex-specific variation in ‘b’ value was only observed for C. collare. The condition factor value ranged from 0.52 to 2.25 and was highest in K. axillaris and lowest in C. collare. Owing to the importance of LWRs and K data to understand the relative condition of populations, species ecology, demographic assessment, and species management, the present study has a great significance in fishery biology.

本研究报告了五种海洋有鳍鱼的长度-重量关系（LWRs）和富尔顿条件因子（K）[（Siganus vermiculatus（Valenciennes，1835），Kathala axillaris（Cuvier，1830），Volocans volitans，Linnaeus，1758，Chaetodon来自印度的Parangipettai（东海岸，泰米尔纳德邦）和孟买（西海岸，马哈拉施特拉邦）的Bloch，1787年和Boleophthalmus dussumieri Valenciennes，1837年]。从2018年1月至2018年12月，每月共采集代表5种鳍鱼的1451个标本，并计算性别比。根据总长（TL）和体重（BW）的估算值，生长参数（b），计算生长参数的性别特异性差异及其每月变化。性别比为女性偏见，在除大肠杆菌外的所有物种中，性别比均与1：1显着不同。轻水堆参数' b'的值在2.734至3.201之间变化（ 对于所有物种，r ²  > 0.96且P <0.0001），且均在2.5至3.5的预期值之内。Vol.ans和B. dussumieri的参数' b '的值不在贝叶斯预测的95％置信区间内。然而，对于S. vermiculatus，C. collare，和 K.酸枣参数' b '的值在贝叶斯预测的范围内。所有物种的轻水堆参数“ b ”的值每月都有明显变化。样本量对“ b ”值没有影响。仅对衣领梭菌观察到性别特异性的“ b ”值变化。条件因子的值在0.52至2.25之间，最高的是腋臭K，最低的是衣领。由于LWRs和K数据对于了解种群的相对状况，物种生态学，人口统计学评估和物种管理的重要性，因此本研究在渔业生物学中具有重要意义。