• 한국수산과학회지
• /
• 제42권6호
• /
• pp.628-632
• /
• 2009

In order to estimate acute toxicity of various heavy metals on mysid, Neomysis japonica, the experiments were conducted by renewal bioassay method at $20\pm0.5^{\circ}C$ and $30\pm0.3$ psu salinity. The 96 hr $LC_{50}$ of Neomysis japonica exposed to cadmium, copper, zinc, arsenic, lead and chromium were $90.4\;{\mu}g/L$, $82.3\;{\mu}g/L$, $646.1\;{\mu}g/L$, $1488.5\;{\mu}g/L$, $1758.8\;{\mu}g/L$ and $1609.6\;{\mu}g/L$, respectively, and were ranked in order of toxicity: copper > cadmium > zinc > arsenic > chromium > lead.

• 한국양식학회지
• /
• 제22권1호
• /
• pp.92-99
• /
• 2009

대하새우 양식장에 서식하는 곤쟁이 Neomysis japonica (Ishikawa and Oshima, 1951)의 개체군 역학과 성 성숙에 관한 전반적인 생물학적 정보를 밝히기 위해 2002년 10월부터 2003년 9월까지 12개월 동안 매월 1회씩 충남 태안군 남면 당암리에 소재한 순천향대학교 해양수산연구소의 대하새우 양식장에서 표본을 채집하였다. 개체군의 특성을 알기 위해 성비, 성 성숙도, 포란수 그리고 성장계수 등을 조사하였다. 암컷이 수컷에 비해 월별 성비가 높았고, 평균 갑각장은 수컷($2.42\;mm{\pm}0.52$)이 암컷($2.31\;mm{\pm}0.48$)보다 높았으나 모두 오차 범위내에서 차이를 보여 갑각장의 크기는 통계학적으로 유의하지는 않았다. 암컷은 성체의 크기가 큰 개체가 많은 난을 포란하였으며, 암컷의 50%가 포란하는 체장은 4.48 mm였다. von Bertalanffy, 성장 매개변수를 바탕으로 한 계절별 성장 속도는 암컷이 수컷보다 빨랐으며, 양식장내에 서식하는 개체군은 일년 중 2회의 가입을 하는 것으로 나타났다. 암컷과 숫컷의 상대성장을 회귀직선 방식으로 비교한 결과수컷의 성장속도가 암컷보다 조금 빨랐다.

• 한국양식학회:학술대회논문집
• /
• 한국양식학회 2004년도 수산관련학회 공동학술대회 발표요지집
• /
• pp.226-227
• /
• 2004

• 한국수산과학회지
• /
• 제40권2호
• /
• pp.84-94
• /
• 2007

The comparative feeding ecology of greenling Hexagrammos otakii and Schlegel's black rockfish Sebastes schlereli populations was investigated in the Jangbong tidal flat near Incheon, Korea. Monthly samples were taken using a modified otter trawl from November 1999 to January 2001. The stomach contents of 124 greenling and 115 Schlegel's black rockfish were analyzed. The diet of H. otakii was dominated by the amphipods Gammaropsis iaponicus, Caprella scaura, Isaeopsis sp. and Monocorophium acherusicum, the shrimps Latreutes mucronatus and Alpheus japonicus, the mysid Neomysis orientalis and the bivalve Mytilus edulis. In contrast, S. schlegeli mainly fed on the mysids N. orientalis, N japonica, and N. awatschensis, the shrimps Exopalaemon carinicauda, A. japonicus and L. mucronatus, and the fish Pholis fangi and unidentified gobiids. A comparison of the frequency and abundance of food items showed that crustaceans (e.g. amphipods, mysids and shrimps) were important foods for both species. Their main dietary components, however differed which is probably due to differences in the spatial distribution of the two species and their prey items. In conclusion, greenling and Schlegel's black rockfish, despite being sympatric on a tidal flat have distinct food habits and low dietary overlap (Schooner's index: 0.1). These results indicate, to some extent, resource partitioning for the maximum utilization of available foods in the tidal flat.

• 한국환경과학회지
• /
• 제33권2호
• /
• pp.139-160
• /
• 2024

The community structure of benthic macroinvertebrates in the Madongho Wetland protected area and inflow river located in Goseong-gun, Gyeongsangnam-do, was investigated in 2022 and 2023. We collected and identified 3,582 individuals belonging to 7 classes, 23 orders, 51 families, and 78 species over the 2 years from six sites. Gnorimosphaeroma naktongense was the dominant species with a ratio of 20%, and Caridina denticulata denticulata was the subdominant species with a ratio of 13.32%. Predators and gathering collectors were the most abundant in the functional feeding group, while sprawlers were the most diverse and numerous in the habitual dwelling group. Diversity, richness, dominance, and evenness were calculated as the biological indices. In addition, various biological water quality indices were calculated. Most insects in the inflow rivers belonged to group I in evaluating relative resistance and resilience, showing high colony stability. The results of analyzing the correlation between salinity and substrate particle size with brackish water species showed that Gnorimosphaeroma naktongense and Hediste japonica had a significant positive correlation with salinity, while Assiminea lutea and Neomysis awatschensis had a significant positive correlation with substrate particle size. Additionally, Sinelobus kisui was found to be a new record of Korean Tanaididae in this study.