The distribution of eggs and larvae of mackerel, Scomber japonicus was examined in the coast of Jeju island, Korea in spring from April to May in 2013 and May to June in 2014. In the monthly variations of mean abundances, as a whole, mackerel eggs were observed abundantly in April, 2013, and mackerel larvae were observed abundantly in June, 2014. Especially, high densities over 5,000 ind./1,000 m3 of mean eggs abundances were observed in the eastern part of Jeju Island where is water temperature was over 18℃. It can be inferred that these areas were major spawning grounds of mackerel around Jeju island, and that it may be caused by influences of the Tsushima warm current.

• 이승종(국립수산과학원 제주수산연구소) | Seung-Jong LEE
• 한송헌(국립수산과학원 제주수산연구소) | Song-Hun HAN
• 김종빈(국립수산과학원 동해수산연구소) | Jong-Bin KIM Corresponding author