مطالعه تشريحي و بافت شناسي مراحل رسيدگي تخمدان در كيلكاي معمولي جنوب درياي خزر

Anatomical and histological study of ovary maturity stages of common kilka (Cluponella delicatula)

Some biological characteristics in common kilka(Clupeonella delicatula), including its maturity stages (macroscopic and microscopic), fork length, weight, ovary weight and the oocyte diameter were investigated. For this purpose, 557 common kilka were sampled totally in Babolsar commercial fishing region from April to August 2000.The research indicated that common kilka cached by conic net & light in Babolsar region had four maturity stages. Microscopic study of ovary for determination of maturity stage verified by macroscopic recognize, therefore practically without histological sections, ovary stages confidently could be determined. Absence of positive reaction to light in 5th and 6th stages could be deducted considering the results of this study.The ratio of maturity stages of I to VI, was %2.28, %74.9, %18.46 and %4.36 respectively.The averages of fork length were 69.82, 83.56, 88.38 and 88.43 mm and the weight averages were 2.2, 4.18, 4.77 & 5.06 respectively for maturity stages of I, II, III and IV. The significant differences for length and weight were found between I, II, III st. (p<0.05).