Allometry coefficient variations of length-weight relationship of Scombridae family caught along the Tuticorin coast, Bay of Bengal

Abstract

The present study assesses length-weight relationship (LWR) of <em>Auxis thazard, Auxis rochei, Euthynnus affinis, </em>and <em>Katsuwonus pelamis</em> caught by gill net along the Tuticorin coastal area. The fitted regression model resulted (log-transformed) in slope values extending from 2.9 to 3.8. The logarithmic data exhibiting the exponent value b > 3 and b < 3, confirms that the tuna species showed both negative and positive allometric growth. Particularly, <em>K. pelamis</em> (b < 3) indicated the negative allometric growth. The regression slope value for all the species was found to be highly significant (P < 0.05). All the species showed positive allometric growth, except <em>K. pelamis</em>, which exhibited negative allometric growth. Findings in the present study conclude that LWR does not follow the cubic relationship. Furthermore, studies should be carried out for more fish species to enlighten biologists about the status and growth condition of the fishes in the natural waters.