• Food Science and Biotechnology
• /
• 제18권2호
• /
• pp.367-373
• /
• 2009

Regional variation in the fatty acid content of shellfish was investigated on 5 species of Korean shellfish including murex shell, ark shell, jack-knife clam, orient hard clam, and little neck clam that were originated from 2 geographically different regions in Korea (Region 1: South coast, $34-35^{\circ}N$, $127-129^{\circ}E$; Region 2: West coast, $36-38^{\circ}N$, $126-127^{\circ}E$). Significant regional difference in total fatty acids content was observed in murex shell and little neck clam (p<0.01), but not in the other species of shellfish. The contents of saturated fatty acids, monounsaturated fatty acids, and polyunsaturated fatty acids including n-3 and n-6 fatty acids were appreciably higher in murex shell from Region 2 and in little neck clam from Region 1 than the shellfish originated from their counterpart areas (p<0.05). Nevertheless, relative percentages of the fatty acids remained constant within same species regardless of geographic regions or species. Considering the facts of that the fish/shellfish are unique sources of n-3 fatty acids and a little neck clam is the most-consumed shellfish in Korea, n-3 fatty acids intake might vary with the habitat of the shellfish that Koreans consume.

• 한국수산과학회지
• /
• 제41권4호
• /
• pp.253-260
• /
• 2008

Gonadal development, gametogenesis, reproductive cycle, spawning, relative weight of flesh, and onset of sexual maturity of the murex shell, Ceratostoma rorifluum, collected from the rocky intertidal zone of Daehang-ri, Buan-gun, Jeollabuk-do, Korea were investigated monthly from January to December 2005 both cytologically and histologically. The gonads were widely placed on the digestive gland located in the posterior spiral fleshy part in the shell. C. rorifluum had separate sexes, and was an internal fertilizer. The sex ratio of females to males was approximately 1:1. The ovary and testis contained a great number of oogenic follicles and spermatogenic tubules, respectively. The oogonia and fully ripe oocytes were $15-19{\mu}m$ and $150-160{\mu}m$ in diameter, respectively, and the cytoplasm of the ripe oocytes contained a number of yolk granules. The relative weight of flesh reached a maximum in August($39.35{\pm}0.40%$), and then decreased rapidly in November($32.75{\pm}1.20%$). The percentages of female and male snails at first sexual maturity with shell heights ranging from 12.1-14.0 mm were 60.0% and 52.9%, respectively, while 100% of the snails of both sexes with shell heights over 18.1 mm were reproductively active. Based on the gonadal development and histological observations, the reproductive cycle of the snail could be categorized into five successive stages: early active(December to May), late active(March to July), ripe(June to September), spawning(July to October), and recovery(October to March). C. rorifluum spawned once a year between July and October, and the majority of spawning occurred in September when the seawater temperature exceeded $23.5^{\circ}C$.

• 한국수산과학회지
• /
• 제37권5호
• /
• pp.385-392
• /
• 2004

Gonadal development, gametogenesis, reproductive cycle, gonad index, and flesh weight rate of the murex shell (Ocenebra japonica) collected from the rocky intertidal zone of Buan-gun, Jeollabuk-do, Korea were investigated by means of histological method from January to December 2002. O. japonica had separate sexes, and was oviparous. The gonad was widely situated on the surface of the digestive gland located in the rear of the spiral flesh part in the shell. The male penis was located near the two tentacles. The ovary was composed of a number of oogenic follicles, and the testis was composed of several spermatogenic tubules. The size of ripe oocyte was approximately $140{\mu}m$ in diameter. The gonad index (GI) began to increase in March $(33.24{\pm}2.33)$ and reached the maximum in June $(47.77{\pm}1.90)$ Thereafter, the values decreased from July $(45.12{\pm}3.60)$ to October $(19.32{\pm}2.91)$. The flesh weight rate (FWR) began to increase in January $(25.93{\pm}1.32)$ and reached the maxium in May $(31.78{\pm}1.09)$ Thereafter, the values decreased from June $(31.50{\pm}0.66)$ to October $(24.09{\pm}1.60)$. The reproductive cycle could be classified into five successive stages: early active (October to April), late active (January to June), ripe (May to September), spawning (July to September) and recovery (September to February). The reproductive cycle was closely related to the seawater temperature.

• 한국식품과학회지
• /
• 제34권6호
• /
• pp.1130-1133
• /
• 2002

Domoic acid는 기억 상실성 패독으로 알려진 신경독소로서 위장관에서 흡수되어 중추신경계에 손상을 주어 기억 상실을 야기한다고 알려져 있다. 미국 FDA와 캐나다 보건 후생성은 가식부 g당 $20\;{\mu}g$으로 조개류의 domoic acid 함량을 법적으로 규제하고 있다. 돌말류인 Nitzschia pungens f. multiseries에 의하여 생성된 domoic acid는 조개에 섭식되면서 축적이 일어난다. Nitzschia pungens f. multiseries는 우리나라 남부 해안에 5월경 발생하는 식물성 플랑크론이다. 조개의 섭취량이 높은 한국인의 domoic acid에 대한 노출 정도를 평가하기 위하여 복족류인 삐뿔 고동과 이매패류인 굴, 바지락, 백합, 가무락, 동죽, 피조개, 홍합, 피조개, 가리막조개, 비단조개, 고막을 1999년 5월, 6월, 7월, 8월, 10월, 12월에 수집하였다. Domoic acid의 미국 및 캐나다의 법적 규제치인 $20\;{\mu}g/g$에 상응하는 농도를 기준으로 조개 시료에 $80\;{\mu}g$을 첨가하고 추출한 결과 회수율은 $95.80%({\pm}1.09)$이었으며 검출 한계는 50 ng/g이었다. 수집된 68개 모든 시료에서 검출되지는 않았지만 한국인이 전혀 노출되지 않았다고 단정지을 수는 없다. 앞으로 우리나라에서도 기억 상실을 나타내는 식중독 사건에 대한 연구가 지속되어야 기억 상실성 패류 독소에 의한 식중독을 미연에 방지할 수 있다고 사료된다.