Age and Growth of the Goldeyes Rockfish Sebasetes thompsoni in the Ulleungdo and Dokdo Areas

Abstract

We studied the characteristics of age and growth of the Goldeyes rockfish Sebasetes thompsoni in the Ulleungdo and Dokdo areas by using 730 otoliths from February 2013 to February 2014. The lowest value of the marginal index was found in June once a year. The spawning period was estimated as April. Therefore, the duration from fertilization to the complete formation of the first annual growth ring is fourteen months. From the parameters calculated using the weighted average length of the year ring formation, the growth of S. thompsoni was demonstrated by the von Bertalanffy growth equation as L t =34.68(1-e -0.2113(t+0.7683) ) for females and L t =29.79(1-e -0.2163(t+1.7964) ) for males, L t =32.84(1e -0.25(t+0.57) ) for combined sex. Comparing with growth performance index(Φ) from these 4 offshore areas, parameter of S. thompsoni in Ulleungdo area was 2.4087, that of in Tong-yeong was 2.2835, that of in Aomori was 2.4077 and in Niigata was 2.3927. As a result, the value of Dokdo and Ulleungdo areas showed the highest.

The life history characteristics of Neosebastes pandus and the relationship between sexually dimorphic growth and reproductive strategy among Scorpaeniformes

“…A common feature of Scorpaeniformes is sexually dimorphic growth. While the females of Platycephalus ( e.g ., Coulson et al ., 2017; Gray & Barnes, 2015) and Sebastes ( e.g ., Heo et al ., 2015; Laidig et al ., 2003; Wyllie Echeverria, 1986) species typically grow larger than their males, the reverse is true for the majority of the studied Scorpaena ( e.g ., Bilgin & Çelik, 2009; Stewart & Hughes, 2010) and Helicolenus species ( e.g ., Kelly et al ., 1999; Massutı́ et al ., 2000; Paul & Horn, 2009).…”