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http://dx.doi.org/10.7837/kosomes.2019.25.2.220

Distribution of Common Squid Todarodes pacificus Larvae in the Southwestern Part of the East Sea in Summer and Autumn, 2015  

KIM, Yoon-Ha (Fisheries Resources Management Division, National Institute of Fisheries Science)
SHIN, Dong-Hoon (Fisheries Resources Research Center, National Institute of Fisheries Science)
Publication Information
Journal of the Korean Society of Marine Environment & Safety / v.25, no.2, 2019 , pp. 220-228 More about this Journal
Abstract
To determine the horizontal and temporal distribution of common squid larvae, Todarodes pacificus (hereafter T. pacificus), we conducted surveys using an IKMT net (mesh size: $500{\mu}m$) with a Fisheries Research Vessel (FRV, TAMGU 21) in the southwestern part of the East Sea in summer (August and September) and autumn (November) 2015. A total of 228 larvae, ranging in mantle length (ML) from 1.4 mm to 21.9 mm, were collected at 35 stations over the research period. The monthly average mantle length of T. pacificus larvae did not differ significantly in August, September and November. (p > 0.05). Catch densities at positive stations ranged between 0.1 and $7.9inds./1,000m^3$ over the research period. Incidence rates of T. pacificus larvae were similar over three months, in the study area (62.9 % - 68.6 %). The 4 - 5 mm mantle length range had the highest frequency in size-frequency distributions for T. pacificus larvae. The larval survival temperature ($15-24^{\circ}C$) at positive stations for catch densities was located below a 20 m depth in August whereas it was located at the surface of the water in September and November. The survival temperature for larvae existed from the bottom to the surface of the water where larvae were sampled larvae in shallow sea areas. However, the larval survival temperature occurred in a shallower location than the upper layer of the thermocline in deep sea areas at a depth below 100 m.
Keywords
Common squid; Todarodes pacificus larvae; Mantle length; East Sea; Distribution; Temperature;
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Times Cited By KSCI : 5  (Citation Analysis)
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