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Ronald. G. Noseworthy,홍현기,Shashank Keshavmurthy,이희정,정희도,주세종,김종빈,정석근,최광식 한국해양과학기술원 2016 Ocean science journal Vol.51 No.1
Corals reefs and communities support a wide range of flora and fauna. The complete richness and abundance of faunal communities in either coral reefs or communities is not fully understood. This is especially true for high-latitude coral communities. In this work, we carried out an analysis of an Alveopora japonica associated mollusk assemblage, in Jeju Island, Korea. A. japonica is one of the major coral species present in high abundance (88–155 colonies m-2), with a high recruitment rate (7.8 juvenile corals m-2 yr-1) in Jeju Island, and may serve as a habitat for other benthic organisms. In 2012, a total number of 579 A. japonica colonies with sizes ranging between 15.1346.7 cm2 in the surface area were collected from a 1m× 10m quadrat installed at a depth of 10 m at Keumneung, on the northwest coast of Jeju Island. Numerous benthic invertebrates were found to be associated with A. japonica colonies. Twenty-seven bivalves and gastropods were identified, including a boring mytilid, Lithophaga curta, and an arcid, Barbatia stearnsi. A zonalgeographical examination of the distribution ranges of these mollusks revealed a majority of warmer water species. Our observations also showed that A. japonica may be providing a habitat to grazing gastropod, Turbo cornutus, and encrusting Spondylidae and Chamidae bivalves. A. japonica forms a coral carpet with a distinct assemblage of bivalves. It is thought that the presence of these mollusks species in the coral indicates its use as a nursery for juvenile species, a ready food supply of organic detritus, and a refuge from predators.
Jeung, Hee-Do,Keshavmurthy, Shashank,Lim, Hyun-Jeong,Kim, Su-Kyoung,Choi, Kwang-Sik Elsevier 2016 Aquaculture Vol.464 No.-
<P><B>Abstract</B></P> <P>Oyster culture forms one of the major produce of aquaculture industry in Korea. Due to the demand for production, it is necessary to maintain a steady culture process. However, as a result of oil spill accident and other environmental problems in the west coast, there is a need to find a quick recovery in the production of oysters. While oyster culture in Korea is dominated by use of diploid oysters, an alternative to fast recovery for oyster industry is to introduce the use of triploid oysters. Triploid oysters have advantage in terms of faster growth and negligible quantity of reproductive effort during spawning, resulting in shorter grow-out period and improved meat quality compared to diploid oysters. In this study, we determined the reproductive effort in triploid females of Pacific oyster, <I>Crassostrea gigas</I> using an indirect enzyme-linked immunosorbent assay (ELISA). Two years old triploid and diploid female oysters raised in rack and bag oyster culture system on the west coast of Korea were collected during spawning and post-spawning season in 2013. Histology revealed that the diploid females spawned from June to September, with a peak in June. Unlike diploids, the triploid females exhibited no sign of spawning as the diploids were actively engaged in spawning. During post-spawning season, the triploid oysters reabsorbed the mature remnant eggs in their follicles. Gonad somatic index (GSI), determined using ELISA, of the diploid females reached its peak in June as 22.2%. In contrast, GSI of the triploids recorded during spawning peak was only 3.4%. Carbohydrate and glycogen contents in the triploid oyster tissues during spawning season were much higher than in diploids, suggesting that the triploids used minimum energy for reproduction in summer season, containing very small amount of gonad and high level of glycogen.</P> <P><B>Statement of relevance</B></P> <P>Reproductive efforts (amount and number of eggs) of the diploid and triploid Pacific oysters measured in this study clearly demonstrated sterility of the triploid oysters during spawning season in summer. The present study also report gametogenic pattern of the triploid, crucial in the management of oyster aquaculture.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Precise quantification of the reproductive effort in a triploid oyster by indirect ELISA </LI> <LI> Diploid oysters grown in natural environment </LI> <LI> Faster growth and negligible reproductive effort during spawning </LI> <LI> Economical and profitable due to faster production and increased quality </LI> </UL> </P>