• 한국수산과학회지
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• 제49권3호
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• pp.351-358
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• 2016

The aim of this study was to verify the performance of Teleaulax amphioxeia as prey for Brachionus plicatilis and for the larvae of the bivalves (Pacific oyster Crassostrea gigas and Manila clam Ruditapes philippinarum) to select the best of five T. amphioxeia strains. The five strains of T. amphioxeia were collected from the coasts of Korea, purecultured and then fed to the rotifer and bivalve larvae. The density and fecundity rate of the rotifer fed on strain 01 were the highest. The instantaneous growth rate of the rotifer fed strain 08-2 was the highest. The maximum density and fecundity rate of the rotifer fed strain 08-2 were significantly higher than those fed Chlorella ellipsoidea, while instantaneous growth rate showed the opposite pattern. Survival rates of the Manila clam larvae fed each strain of Teleaulax showed no significant difference between strains. Survival rates of the Pacific oyster fed Teleaulax were significantly higher than those fed Chaetoceros sp., but lower than those fed I. galbana. This study indicates that strain 08-2 showed better growth for B. plicatilis and better survival for the bivalve larvae than did the other strains, and that T. amphioxeia can also be used as a prey organism for rotifers or bivalve larvae.

• 한국해양학회지
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• 제23권3호
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• pp.123-129
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• 1988

본 연구는 국내산 각종 이매패류의 마비성패독에 의한 독화상황을 조사한 것이다. 조사된 28종의 이매패 중에서 진주담치(Mytiluks edulis galloprovincialis), 홍합(M. corsucus), 큰 가리비(Patinopecten yessoensis), 비단가리비(Chlamys farreri), 비단조개(Peronidia venulosa) 및 반지락(Ruditapes philippinarum)에서 독성이 확인되었다. 지역적으로는 전 연안의 패류에서 독성이 확인되기는 하였으나, 주로 남해 동부역의 진동만 부근에서 독화현상이 관찰되고 있고, 동해안의 포항에서도 독성이 확인되었다. 독화하는 시기는 포항의 경우 5월-8월 이었으나, 그 밖의 연안역에서는 주로 4월-6월 이었으며, 독성은 전반적으로 외국에서의 허용한계값인 4 MU/g 가식부를 초과하지는 않았으나, 진동만과 철천수로 및 포항의 시료에서 이를 약간 상회하는 독량이 검출되기도 하였다.

• 한국어류학회지
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• 제26권4호
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• pp.349-354
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• 2014

필리핀 일로일로 주변해역에 출현하는 몽치다래(Auxis rochei)의 위내용물 조성을 연구하기 위하여 2013년 12월에서 2014년 5월까지 매월 채집하였으며 채집된 몽치다래의 총 개체수는 200개체였다. 이들의 가랑이체장(FL)은 11.1~31.2 cm의 범위를 보였다. 위내용물을 분석한 결과 몽치다래는 어류(fishes)를 가장 선호하는 epipelagic feeder로 나타났다. 어류 다음으로 중요한 먹이생물은 새우류(shirmps), 요각류(copepods), 게유생 (crab larvae), 단각류 (amphipods), 두족류 (cephalopods)로 나타났으며, 갯가재류 (stomatopods), 이매패류 (bivalves), 패충류(ostracods) 등도 섭식하였지만 그 양은 많지 않았다. 몽치다래의 섭식패턴에 대한 도해적방법의 결과는 몽치다래가 좁은 섭식폭을 가지며, 어류를 주로 섭식하는 specialized feeder임을 보였다. 모든 크기군에서 어류를 주로 섭식하였으며, 크기가 증가함에 따라 어류의 섭식비율이 증가하는 경향을 보였다.

• 한국해양학회지
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• 제6권1호
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• pp.49-55
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• 1971

1969년 10월에 완성된 남강 다목점 댐과 방수로가 준공되어 1969년에 7회, 1970년에 3회 합계 10회에 걸쳐 1,359 $10^{6}$㎥ 이상의 담수를 진주만으로 방수하였다. 방수 속도는 최고 약 3,770㎥/sec 에 이르렀으며 1회 누적 방수량은 최고 4.50 $10^{6}$㎥ 이상에 달하였다. 이 결과 방수로 하류부와 연결되는 사천만 북부에서는 5kt 이상의 빠른 유속이 해저의 토사를 이동시켜 간석지와 해저의 지형을 변동시켰다. 양식장 시설물과 패류를 매몰, 유실 시키는 원인이 되었다. 하구 현상이 일어 났으며 2중조가 관측되었다. 어구의 파손, 발장의 도괴 및 어선의 조업 불능 등으로 피해가 막심하였다. 방수후 진주만의 염분은 급격히 하강하였으며 특히 사천만 에서는 밀물때에도 5 이하의 이상저염분수가 분포하였다. 현저한 조경이 이루어졌으며 반조석 주기에 4.6 에서 30 로 약 25 이상의 염분 급변이 있었다. 이와같은 염분의 저하와 급변은 동해역의 굴, 바지락 등 패류를 폐사시키고 멸치, 문어 등을 만외로 추방하는 원인이 되었으며, 내유 어군의 접근을 방해하였다. 염분의 저하는 해수의 밀도와 삼투압 환경을 급변 시키는 원인이 되었고, 투명도가 낮은 혼탁한 물덩이는 광선의 투입을 방해하여 광합성 작용을 억제할 것이다.

• 한국패류학회지
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• 제29권4호
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• pp.377-380
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• 2013

This study investigated concentration of metal ions in sediment and intersexuality in Polymesoda erosa and Lutraria lutraria. Samples were collected from five areas of Ha Long Bay in October, 2012. The concentration of metal ions showed that Al ($37390.0{\pm}11816.5mg/kg$) was highest and Mn ($360.4{\pm}101.4mg/kg$) was second high concentration. Cd ($0.04{\pm}0.05mg/kg$) was lowest. The intersexuality was 14.3% in P. erosa and 9.1% in L. lutraria that observed only in female.

• 한국패류학회지
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• 제10권2호
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• pp.41-46
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• 1994

The Antarctic soft-shelled clam, Laternula elliptica is widely distributed in shallow waters around the Antarctic Continent and islands. This bivalve species occurs in densepatches particularly in sheltered but frequently ice-impacted areas. This species mostly occurs at atound 20-30 m depth and is rarely found at depths shallower than 5 m where ice abrasion by drifting or grounded icebergs is severe. It burrows deep into sedimint(frequently >50 cm), which seems to be primarily a means for avoiding ice impacts. A pair of stout and highly extendable siphons appear to be a morphological reature to feed in the ice-scoured substrates while staying deep in the sedimint. As one of the largest bivalves in the Antarctic waters, L. elliptica appears to grow rapidly, reaching to a shell length of approximately 100 mm in 12 or 13 years. L. elliptica feeds sctively during summer when food is sufficiently provided, implying that food may be the most inportant fator regulating the growth. Seasonal variations in food availability, and metabolic process in starvation condition possibly during winter, however, are yet to be further investigated.

• 한국패류학회지
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• 제24권1호
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• pp.33-40
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• 2008

Ultastructural studies of oocyte degeneration and follicle cells in female Spisula sachalinensis are described for clams collected from Jumunjin, Gangwondo, Korea. The follicle cells playan integral role in vitellogenesis and oocyte degeneration by assimilating products originating from the degenerated oocytes (thus allowed the transfer of yolk precursors needed for vitellogenesis). The functions of the follicle cells include phagocytosis and intracellular digestion of products originating from oocyte degeneration. During the period of oocyte degeneration, follicle cells of this species probably have lysosomal systems for the breakdown and reabsorption of various phagosomes(phagolysosomes) in the cytoplasm for nutrient storage; this process has been observed in other bivalves.

• 한국수산과학회지
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• 제37권1호
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• pp.33-43
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• 2004

A carbon budget model was constructed and analyzed for the Bangjukpo surf zone ecosystem in southern Korea by using the NETWRK. The model consists of 11 living and 1 non-living groups. Using boxes and arrows, a topological map was created to depict biomasses of each group and exchange rates between them. The system includes primary producers of phytoplankton and benthic algae, primary consumers of particle feeding zooplankton, carnivorous zooplankton, meiobenthos, malacostracans and bivalves, and top consumers of detrivorous, omnivorous, carnivorous and piscivorous fishes. The surf zone ecosystem was analyzed by means of network analysis, showing total system throughput of $574\;gCm^{-2}yr^{-1},$ development capacity of $1,876\;gCm^{-2}yr^{-1},$ ascendancy value of $768\;gCm^{-2}yr^{-1},$ Finn cycling index of $4.4\%$ and internal relative ascendancy of $27\%.$ These results were compared with similar data from other systems.

• 한국패류학회지
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• 제31권3호
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• pp.253-255
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• 2015

The family Olividae includes predatory species with medium-sized, glossy, elongated oval-shaped shell. As sand-dwellers, they are broadly distributed in tropical and subtropical oceans. They feed mostly on other mollusks and carrions including sea snails and bivalves. To date, two species in the genus Amalda (subfamily Ancillinae) have been reported in Korean waters. In this study, Amalda rubiginosa (Swainson, 1823) was collected from Korean waters and morphologically described in details as a first record.

• 한국패류학회지
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• 제31권3호
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• pp.221-232
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• 2015

Observations in beach, intertidal and upper subtidal environments in Peter the Great Bay (north-western East Sea) have shown that attached algae were found on empty shells of 13 species of epifaunal and infaunal bivalve mollusks. Thirteen algae species were identified on empty dislodged shells but more than 50 species are known to be epibiotic on living bivalves. The dislodgement of shells with attached algae takes place in semi-enclosed, low-energy areas, as well as those which are open and affected by strong wave action, indicating the large scale of this phenomenon. The significance of seaweed transportation of living mollusks and their empty shells in the coastal zone, involving both taphonomic and ecological processes, is stressed. Algae appear to be a taphonomic agent and play a similar role as compared to birds or hermit crabs, but they act passively and contribute to environmental mixing in death assemblages in coastal environments.