Length-Weight Relationships of Fifty Fish Species from Indian Waters
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Length-Weight Relationships of Fifty Fish Species from Indian Waters Subal Kumar Roul 1
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& A. R. Akhil & T. B. Retheesh & K. M. Rajesh & U. Ganga & E. M. Abdussamad & Prathibha Rohit
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Received: 19 February 2020 / Revised: 15 May 2020 / # Springer Nature Switzerland AG 2020
Abstract Length-weight relationships (LWRs) were estimated for 50 fish species belonging to 14 families from Indian waters. During the fishery surveys, specimens were collected from various fishing gears such as ring seines, gill nets, trawls and long lines between 2015 and 2017. The number of specimens measured varied by species. All the values of the parameter b were found within the expected range of 2.5–3.5. The b values in the relationships, W = aLb varied between 2.562 (Stolephorus insularis) and 3.461 (Auxis thazard) with mean value of 3.032 (SE = ± 0.029). The LWRs of all the 50 fish species estimated in this study were highly significant (p < 0.001, r2 ≥ 0.850). The study provides the first estimate of LWRs for Scomber indicus, Sphyraena arabiansis and Upeneus margarethae, and complements the existing LWRs in the international literature and FishBase database. In addition, this study reports the new maximum size for Nematalosa nasus (28.5 cm TL, 281 g TW), Scomberoides commersonnianus (122 cm TL, 11400.5 g TW), Scomberoides tol (56 cm TL, 1000 g TW), Alepes djedaba (33.5 cm TL, 343.8 g TW) and Upeneus margarethae (19 cm TL, 87 g TW). This study provides basic biological information in the form of a length-weight key for 50 commercially important fish species from Indian waters as a valuable tool to assist fishery managers. Keywords Length-weight relationships . Indian waters . Isometric growth . Allometric growth
Introduction Biometric relationships have been frequently used in fisheries research and management in order to transform the field-collected data to suitable indexes (Anderson and Gutreuter 1983). Length-weight relationships (LWRs) is one of the most commonly used tools for any analysis of fishery data (Türker et al. 2018). The LWRs is predominantly useful to estimate the average weight for a given length group, and convert length measurement into weight where technical difficulty exists in weighing, particularly the large-sized fishes in the field or on-board vessels (Froese 2006; Froese et al. 2011).
* Subal Kumar Roul [email protected] 1
Puri Field Centre of ICAR-Central Marine Fisheries Research Institute, 752 002 Puri, Odisha, India
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ICAR-Central Marine Fisheries Research Institute, 682 018 Cochin, Kerala, India
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Mangalore Research Centre of ICAR-Central Marine Fisheries Research Institute, 575 001 Mangaluru, Karnataka, India
Besides the estimation of weight from length data, it has got several other applications in fishery science, such as conversion of a growth equation in length into a growth equation in weight (Pauly 1993), estimation of yield and biomass of a fish population (Anderson and Gutreuter 1983), biometry and morphological comparisons between species or populations of the same s
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