Characteristics of productive broodstock based on body length and gonad histology of eel (Monopterus albus) in Semarang

The purpose of this study is to describe the characteristics of productive broodstock based on body length and histological gonad description of eels in Semarang. Samples of catched eels in various sizes, each measured its length and weight, determined its sex, recorded morphologically and made microtechnic histological description of gonads. Based on description of gonad hyostology, the eels body length is 28-32 cm for female and consists of egg cells set, which are in 32-36 cm is intersex, the egg cell is decreased sperm cells begin to develop and those are in 37-45 cm. Based on IKG eels obtained in four subdistricts, the egg size cannot be measured because they are in 1.7 to 2.3 mm. Based on gonads microscopic view and visual body length at TKG II, TKG III and IV consisted of eggs and sperm. While eels IKG obtained the most are 25 eels in IKG class 2.829943-3.829943. Conclusion of this research showed that productive female eels have an average body length of 26 - 34 cm with a morphology characteristic sharp head, greenish skin color on the back and yellowish white on the abdomen. Productive male eels have a body length in 54 - 60 cm with a morphological characteristic is greenish brown back, brownish yellow belly, large head and nape size, slightly short tail and blunt ends.