Interrelationship Between Morphometric Variables Andbody Weight Capoeta trutta (Heckel, 1843) Evaluated by Path Analysis in Gamasiab River of Kermanshah Province, West of Iran

The objective of this study was to verify which morphometric measures are more directly associated with the Body weight of black fish (Capoeta trutta). A 252 samples of black fish(167 maleand 85 female) from Gamasiab River with average body weight 104.19±2.98g(Male 93.20±1.73g and Female 125.78±7.65g) were caught, weighed and measured morphometric characteristics. The morphometric measures taken were: body weight (BW g), body length (TL mm), standard length (SL mm), fork length (FL mm), body height (BH mm), body width (BD mm), head length (HL mm) and snout length (SNL mm).the phenotypic correlationsanalysis between body weight and morphometric measurements showed that body weight was significant (P<0.01) positively correlated with other morphometric measurements in the male, female and total (male and female).These correlations were later deployed in direct and indirect effects through path analysis and the direct and indirect contributions of each variable were measured in percentage terms. The standard length, head length, body height and snout length measurements were important for determining the body weight of male fish (Capoeta trutta) also the total length and fork length had indirect effect in body weight by snout length. The total length, body height and head length measurements were important for determining the body weight of female fish (Capoeta trutta) also the fork length, snout length, body height and standard length had indirect effect in body weight by total length. The total length, snout length, standard length, head length and body height measurements were important for determining the body weight of total (male and female) fish (Capoeta trutta) also the body weight and fork length had indirect effect in body weight by total length.