Weight–length Relationships and Fulton’s Condition Factors of Ten Commercially Important Scombridae Fish Species in Southeast Coast of India, Bay of Bengal

The aim of the present study was to assess the length–weight relationship and condition factor of ten fish species belonging to Scombridae family. Samples of the each species caught by using multiple types of gear like drift gill net, long line, gill nets and commercial trawls were collected from July 2018 to January 2020. Mainly, drift gill net (mesh size: 120- 140 mm) of 50 m length and 6–8 m breadth by multiday fishing trip lasts for 5 to 6 days and trawlers with a cod-end mesh size of 25–35 mm in single day fishing operated at a depth ranging from 20 and 300 m were used. Among the ten species, five species (i.e. Auxis thazard , Auxis rochei , Acanthocybium solandri , Thunnus albacares and Euthynnus affinis ) showed isometric growth. Growth results of four species (i.e. Katsuwonus pelamis , Rastrelliger kanagurta , Scomberomorus commerson and Sarda orientalis ) indicate positive allometric growth and one species, Thunnus tonggol showed negative allometric growth. The calculated Fulton’s condition factor value ranged from 1.145 to 1.722 indicating a very healthy condition of the fishes. The results revealed intercept slope ‘b’ value range as 3.271 to 2.2581 with r 2 value of 0.959–0.993. The present study has contributed the additional knowledge of fish population of Scombrideae, which could assist fishery management scientists in carrying out future ecological conservative strategies for restoration and management.