ISSN : 1225-3480
The Nagoya Protocol on access to genetic resources went into effect in 2014 emphasizing activities for securing biological resources by cataloging the fitness traits essential for survival in the wild habitats. In this regard, although active research is ongoingly related to applications in human disease and medicine, research at the organism level is still insufficient. In particular, there are no studies pertaining to medicinal mollusks in Korea. In order to improve pertinent literature in this area of study, an attempt has been made to compile past literature and decipher the current status of genetic resources of related species. Taking the leads from the reviewed literature, researchers would be benefitted who wish to conduct related follow-up studies in the future.
This study was conducted for the purpose of redefining the standard Korean names of imported mollusks. For this purpose, 50 species (19 Gastropods, 12 Bivalves and 19 Cephalopods) were selected, and their taxonomic system, morphological characteristics, photographs and pictures were presented as a drawing board.
In order to understand the distribution characteristics melania snail in Hantan River watershed, from May to October 2012, 20 points from the upper stream to the lower stream of the Hantan River watershed were investigated. A total of 5 species of melania snail appeared, and in Sagok Stream, which is the primary stream in the Hantan River, Semisulcospira libertina, S. gottschei, S. coreana appeared, and S. coreana was dominant. In the secondary stream, Namdae Stream , S. gottschei and S. coreana appeared, and the dominant species was S. gottschei. In the main stream of the Hantan River, S. libertina and Koreanomelania nodifira appeared, and S. libertina were dominant. The differences in the species appearing according to the physical characteristics of the rivers were found in the S. libertina, and the flow velocity was less than 20 cm/sec, and S. gottscheri, the bed of sand and pearl. The flow velocity is less than 10 cm/sec, S. coreana has a flow velocity of 10 cm/sec-40 cm/sec with the river bed of pebble, and K. nodifira has a flow velocity of 40 cm/sec or more with the bottom of the boulder, K. globus ovalis appeared at high frequency in boulder riverbeds and in river environments of 50 cm/sec or more, respectively, and the distribution characteristics were similar in the difference in water depth. In this study, it was possible to confirm the river environment preferred by each species, mainly according to the difference in the river bed and flow velocity.
We studied that the environmental characteristics and the factors on the habitat of mud shrimp and ghost shrimp. The mud shrimp, Upogebia major and Ghost Shrimp are an abundant intertidal invertebrate of the west coast of Korean bays and estuaries where they live commensally with the cultured manila clam, Ruditapes philippinarum. And the geochemical characteristics (Mean grain size, COD, ignition loss, AVS, C/S ratio, C/N ratio and depth profile of sediments) on the burrow wall of the mud shrimp, Upogebia major and Ghost Shrimp were determined with those in surrounding non-borrow sediments of tidal flats. And Chlorophyll a content was no significant difference between burrow wall and non-burrow sediments. The C/S ratio showed that survey areas had anoxic or sub-anoxic bottom conditions. These results suggest that fresh organic matter in the burrow wall is supplied from tidal flat surface. Therefore, The Ef and Igeo of the metals proved that habitat characteristics can be classified as heavily to moderately polluted, respectively.
In this study, we estimated the catch of Amphioctopus fangsiao caught by leisure fishing from September to November 2018 around Hongwon port and Maryang port in Seocheon-gun, Yellow Sea. We analyzed the data on the number of fishing boat and the number of fishing man at the Seocheon maritime police station. As result, an average of about 2.8 kg were caught per person and the total catch was 250 tons during the survey period. It accounts for 15% of the total catch in Chungcheongnam-do in 2018. In order to estimate the amount of resources of Amphioctopus fangsiao, we need accurate statistical data on the amount of Amphioctopus fangsiao as a leisure fishing.
The growth of the hard clam, Meretrix petechialis (Lamarck), excavated from the shell middens in the Neolithic Daejuk-ri, Seosan-si, and Eurwang-dong, Incheon-si and the Bronze Age Konam-ri, Taean-gun, and modern populations were compared. The growth-line analysis of the hard clam excavated from shell middens Daejuk-ri and Eurwang-dong was done in previous studies, and that of the hard clam from the Konam-ri Shell Midden was done in this study. The hard clam excavated from the Konam-ri Shell Midden showed correspondence between shell length and ring radius which was clearly distinguishable by age group, so the validity of the age reading was confirmed. For the hard clam from the Konam-ri Shell Midden, growth curve for shell length fitted to the von Bertalanffy's growth curve was expressed as follows: SLt = 138.4244(1-e-0.1335(t+1.0261)). The relationship between shell length (SL) and shell height (SH) was expressed by the following equation: SH = 0.7907 SL + 3.1101 (R2= 0.954). There was no difference in the growth coefficient of the hard clam excavated from shell middens Daejuk-ri, Konam-ri, and Eurwang-dong (p > 0.05).