Hubungan Panjang Bobot dan Reproduksi Ikan Kembung Lelaki (Rastrelliger kanagurta) di Perairan Selat Malaka Tanjung Beringin Serdang Bedagai Sumatera Utara

Abstract

Activities the continuous mackerel of catch will be decreasing fish stock in the nature. The research aims to know relationship among length weight, factor of condition, reproductive, first size riping ovum and apex spawning of mackerel. This research was conducted in Malacca strait Tanjung Beringin Serdang Bedagai from March until May 2015 based on the location of fishing by fishermen divided into three stations at a distance of 3,7 kilometers from the beach and the distance between each station was 1,8 kilometers. Water and fish sampling was carried out for one month. The results showed length weight equation relationship y = 0.000007x 3.09 indicating positive allometric. Factor conditions trend 1,12 – 1,18 were classified as less flat. Sex ratio of fish was ideal conditions. Value of IKG between female 2,87% and male 2,18% respectively. Fecundity was 30.250 – 57.240 granule. First size riping ovum is 164 – 170 mm. This suggests that the presence of the mackerel has a apex spawning in April. The observation of the male histology showed that TKG I was spermatogonium, TKG II dominated by primary spermatosit, TKG III was spermatosit primer developing to be secondary spermatosit, TKG IV was spermatozoa for impregnate nucleus. While the female histology showed that TKG I was dominated by oogonia and cell nucleus, TKG II dominated by oocytes are primary and secondary, TKG III dominated by vitogenesis stage 1 and 2 oocytes, TKG IV dominated by vitelogenesis stage 2 and 3 with developing ootid that was ready to spawn and TKG V dominated atresi oocytes. Spawning types of mackerel is partial spawner.