Length-weight relationships of four different sea cucumber species in North-East coastal region of Sri Lanka
2018
K. Veronika | U. Edrisinghe | K. Sivashanthini | A. R. S. B. Athauda
A detailed investigation on length-weight relationship of four sea cucumber species, <em>Holothuria spinifera, Bohadschia marmorata, Stichopus naso</em>, and <em>Holothuria atra</em> found in the commercial catches of North-East coastal waters of Sri Lanka was conducted from May 2014 to September 2016. Minimum length and weight were recorded in <em>S. naso</em> while maximum size was recorded by <em>B. marmorata</em>. Length-weight relationship was carried out to investigate the correlation coefficient (r), exponent “b” value and condition factor (K). Calculated length-weight relationships obtained for <em>H. spinifera, B. marmorata, S. naso</em> and <em>H. atra</em> were W = -1.824 L<sup>1.887</sup>, W = 0.080 L<sup>1.108</sup>, W = 0.012 L<sup>1.021</sup>, and W = -0.110 L<sup>1.234</sup>, respectively. Correlation coefficient for length-weight relationship ranged from 0.696 to 0.774 and was significant at P<0.01 indicating good correlation between length and weight. The “b” values of <em>H. spinifera</em> (1.887), <em>B. marmorata</em> (1.108), <em>S. naso</em> (1.021) and <em>H. atra</em> (1.223) were significantly different (P<0.05) from the hypothetical value of 3, showing a negative allometric growth pattern. The mean condition factor (K) was greater than 1; <em>H. spinifera</em> (3.89±1.03), <em>B. marmorata</em> (4.12±2.21), <em>S. naso</em> (3.558±1.73) and <em>H. atra</em> (2.688±1.34) indicating the good nutritional condition in all four sea cucumbers species.
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