Study of Relationships Between the Morphometric Characters of the Threadfin Bream, Nemipterus japonicas

Suresh Kumar P. S. and S. A. Mohite*

College of Fisheries, Ratnagiri - 415 629 India.

ABSTRACT: Nemipterus japonicus, the Japanese threadfin bream (Family : Nemipteridae), has wide spread distribution throughout the Indian Ocean and is distributed in the tropical waters from 300N-100S latitude. Out of the three species of Nemipterus, N. japonicus is the most dominant among all the species landed along the Ratnagiri coast of Maharashtra and has a great demand for fresh consumption as well as in surimi industry. Present study analyses the mophometric relationships between the Total length (LT) and other characters such as Fork length (LF’), Standard length (LS), 4. Snout length (UO), Orbital diameter (OO’), Greatest pupil diameter (Eg), Greatest iris diameter (Ig), Dorsal fin base length (D1D1’), Ventral fin length (Vh), Anal fin base length (AA’), Girth height (g), Anal fin height (Ah), Pectoral fin length (Ph), Dorsal caudal fin length (Ch’), Ventral caudal fin length (Ch’’). Relationships statistically calculated are : LF’ = -0.925 + 0.7317 LT, LS = 5.677 + 0.918, UO = 1.7460 + 0.038 LT, OO’ = 1.7244 + 0.0903 LT, Eg = 0.8385 + 0.0261 LT, Ig = -1.4988 + 0.0438 LT, D1D1’ = -0.5988 + 0.2978 LT, Vh = 0.8925 + 0.2042 LT, AA’ = 0.498 + 0.14 LT, g = 0.9621 + 0.1838 LT, Ah = 0.3583 + 0.102 LT, Ph = -0.996 + 0.225 LT, Ch’ = 0.1226 + 0.3881 LT and Ch’’ = 0.6625 + 0.1838 LT.

KEYWORDS:

Nemipterus japonicas; Morphometric relationships

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