study of some biological properties of the mudskipper, periophthalmus waltoni (koumans 1941), in sirik coast, oman sea

this study was carried out to investigate some reproductive traits of periophthalmus waltoni in the coast of sirik city. overall, 496 samples were collected during a year that 291 samples (58.67%) were male and 205 samples (41.33) were female. the sex ratio (m/f) was calculated as 1.41:1 (p<0.05). the smallest captured fish was male (4.8 cm) and the largest captured fish was female (15.5 cm). based on the results, the average total length and body weight of males were significantly more than females (p<0.05). the male and female showed negative allometric growth. also, b value of the male (2.65) was more than the female (2.63) (p>0.05). absolut fecundity and relative fecundity were counted as 5216±2098 and 368±136 eggs, respectively. the results showed a direct relationship between the egg number and total length. according to the results, spawning period was recorded from january to may with two peaks in april and january, which was associated with a maximum mean of total length in this time. on the other hand, the results showed that there is an inverse relationship between temperature and gonadosomatic index.