Abstract
LENGTH-WEIGHT RELATIONSHIP AND CONDITION OF HETEROPNEUSTES FOSSILIS (BLOCH) OF VELLAYANI LAKE, KERALA, INDIA

Athira V. and K. S. Anila Kumary*

ABSTRACT

The present study relates the length-weight relationship and condition factor of Heteropneustes fossilis (Bloch) from Vellayani Lake, Thiruvananthpuram, Kerala. The study was carried out using fishes belonging to different size categories during December 2017 to May 2018. A total of 128 specimens of Heteropneustes fossilis were used for the analysis. The total length of the fishes analysed ranged from 18cm to 31.8 cm with a mean length of 25.27 cm and the total weight ranged from 11.94 g to 216.41 g with an average weight of 116.23 g. The length – weight relationship calculated for the total fishes was W = 0.000070501 L 2.7414. The slope value was lower than the critical isometric value of 3 exhibiting negative allometric growth in larger length groups (25-35 cm) whereas ‘b’ exhibits positive allometric growth in smaller (15-25cm) forms. The condition factor of Heteropneustes fossilis observed ranges from 0.5078 to 1.0284 with a mean value of 0.8802. The negative allometric growth observed in the largest category may be due to lower feeding proficiencies or may be the result of loss of energy for breeding purpose.

Keywords: Length-Weight relationship, condition factor, Heteropneustes fossilis, Vellayani Lake.


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