Taeg Yun Oh

Seasonal variation of fish assemblage in Sacheon marine ranching , the southern coast of Korea

Species composition and seasonal variation of fish assemblage in Sacheon marine ranching, Korea were examined. Sampling was seasonally made by a shrimp trawl from February 2009 to November 2009. A total of 55 species were collected. Of these, five species was dominant species comprising 51.1% of the total number of individuals. Nine species represented 57.3% of the total biomass. While total abundance (number of individuals) was high in spring, total biomass and species richness (number of species) and diversity were high in autumn. Cluster analysis, based on seasonally abundance data of the 21 most common species, showed that the species were separated into 4 different groups. Group A composed of Pholis nebulosa, Pleuronectes yokohamae, Hypodytes rubripinnis, Hexagrammos otakii, Tridentiger trigonocephalus and Paracercis sexfasciata, which were year round residents, group B Congr myriaster, Leiognathus nuchalis, and Platycephalus indicus, which were abundant in autumn, group C Sillago japonica, Pseudaesopia japonica, Zoarces gilli, Pholis fangi, and Pleuronichthys cornutus which were abundant in spring, and group D Sillago sihama, Cociella sp., Johnius grypotus, Cynoglossus joyneri, Cynoglossus robustus, and Pennahia argentata, which were abundant in summer. Principal component analysis revealed that seasonal variation in the fish assemblage was attributed to the abundance of temporal species such as conger and sand smelt fishes, which were abundant in summer, due to seasonal variation of water temperature.

Estimating the biomass of anchovy species off the coast of Tongyeong and Yeosu in South Korea in the spring and winter of 2013 and 2014

Anchovy (Engraulis japonicus) is one of the most important species in the South Sea of South Korea. In order to estimate the biomass of anchovy, acoustic surveys, concurrently with trawling, were conducted in April, July, and September of 2013 and February of 2014 off the coast of Tongyeong and Yeosu. However, anchovies were found only during spring (April) and winter (February) surveys. To display only anchovy species confirmed by trawls on empty spaced echograms, virtual echograms were created. Three target strength (TS) values of anchovy were used: TS_z

Age and Growth of Whitespotted Conger Conger myriaster in the Southern Coastal Waters of Korea

【Age and growth of whitespotted conger Conger myriaster were estimated using right sagittal otoliths from 495 fish collected from February, 2004, to January, 2005, in the southern coastal waters of Korea. Examination of the outer margin of the otoliths showed that opaque zones formed once a year and annual rings formed from April to June. The ages of the specimens examined ranged from 3 to 8 years. Whitespotted conger spawn from December to March. Allometry between preanal length and total weight can be expressed as

Age and Growth of Largehead Hairtail Trichiurus lepturus in the East China Sea

TW=0.0350{\times}PL^{2.9173}

Estimations on population ecological characteristics of small yellow croaker, Larimichthys polyactis by the drift gillnet fishery in Korean waters

(

Distribution and seasonal variations of fisheries resources captured by the beam trawl in Namhae island, Korea

R^2=0.89

Reproduction of the Shotted halibut in the southern Korean waters

). There was no significant difference in allometry between females and males (P>0.05). The estimated VBF growth equation was

The Population Genetic Structure of the Japanese Anchovy (Engraulis japonicus Temminck & Schlegel) in the West, South and East Seas of Korea Based on Microsatellite DNA Analysis

L_t=415.2(1-e^{-0.1457(t+0.4654)})

Larval distribution pattern of Muraenesox cinereus (Anguilliformes: Muraenesocidae) leptocephali in waters adjacent to Korea

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Distribution of Demersal Fish Based on a Combined Acoustic and Trawl Survey during Day and Night in Costal of the South Sea, Korea

-0.4292(t+0.7513) ) for males, where Lt is the total length in mm and t is age in years. The growth rates of males and females were signifi - cantly different (P<0.05).The age composition ranged mostly between ages 2 and 4, and the oldest individuals were 4 years old in males and 6 years old in females. Finally, the age composition of largehead hairtail was compared with data from the 1970s and is discussed in the context of environmental changes.