• 한국어류학회지
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• 제26권1호
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• pp.42-49
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• 2014

조사기간 동안 총 4종의 부유성 어란과 24종의 자치어가 마산만에서 채집되었다. 어란의 우점종은 멸치 (Engraulis japonicus) 어란이었다. 그러나 자치어는 앞동갈베도라치 (Omobranchus elegan), 고등어 (Scomber japonicus), 문절망둑 (Acanthogobius flavimanus), 쥐노래미 (Hexagrammos otakii), 돛양태류 (Repomucenus sp.), Scartella cristata, 망둥어과(Gobiidae sp.) 순으로 우점하였다. 이들 7종은 전체 출현개체수의 78.5%를 차지하였다. 어란과 자치어는 시공간적으로 큰 변동을 보였다. 어란과 자치어의 현존량은 2007년 7월에 가장 높았으며, 2007년 2월에 가장 낮았다. 그리고 난자치어는 다른 정점에 비해 정점 5에서 현존량이 높았다. 어란과 자치어 현존량의 시간적 변화는 수온에 영향을 받았다. 부유성 어란과 자치어는 수심, 지형 등과 같은 물리적 환경 요인에 따라 좀 더 얕은 만 안쪽 정점과 깊은 만 외곽 정점 간 군집 차이를 보였다.

• 수산해양기술연구
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• 제54권1호
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• pp.81-88
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• 2018

A study for species composition and abundance of the fish assemblages in the eastern Jinhae Bay, Korea was conducted using monthly larval collection by a RN80 net from October, 2010 to September, 2011. Of all the 45 species collected, the dominant species were Clupea pallasii, Hexagrammos otakii, Pholis fangi and Engraulis japonicus. Clupea pallasii, Hexagrammos otakii, Pholis fangi in winter and examined Engraulis japonicus, Acanthogobius sp., Parablennius yatabei, and Tridentiger trigonocephalus in summer appeared seasonally. Popoulation characteristic by stations was not clear seasonally and spatially, and appearance aspects of dominant species were similar by stations. Compared our results with other studies in the South Sea, dominant species and their appearance period were similar to their spawning period. Finally, the appearance period of the larvae in the South Sea was closely resulted to spawning period rather than the regional characteristic.

• 한국수산과학회지
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• 제50권1호
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• pp.92-97
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• 2017

The feeding habits of larval Engraulis japonicas (3.2-11.0 mm SL) were examined based on 414 individuals, collected in October 2010, and from June to September 2011, in the coastal waters of Eastern Jinhae Bay, Korea. E. japonicus, fed mainly on copepods 62.6% IRI and tintinnid were the second-largest dietary component. E. japonicus diet also included small quantities of rotifers, eggs and diatoms. The results of analysis of ontogenetic changes showed that E. japonicus of small size classes (${\leq}4mm$) fed primarily on tintinnids. The dietary percentage of copepods decreased, as fish size increased, and monogeneans became increasingly important as size class increased above 4-6 mm. The highest rate of daily feeding E. japonicusi took place during the day.

• 한국수산과학회지
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• 제32권2호
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• pp.134-138
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• 1999

1997년 3월에 부산시 민락동 어시장에서 채집한 등줄숭어 어미들을 실험실로 운반하여 인위적인 방법으로 난을 수정시킨 후, 난의 형태, 난발생과정 및 자어의 성장에 따른 형태변화를 관찰하였다. 1. 등줄숭어의 수정란은 무색투명한 원형의 분리부성란으로, 난경은 0.95$\~$1.06mm이고 부화에 소요된 시간은 수정후 $16.0^{\circ}C$에서 73시 간이였다. 2. 부화 직후의 자어는 전장 1.72$\~$1.92mm로 입과 항문은 열리지 않고, 근절은 19개로 아직 정수에 달하지 않았으며, 몸에는 막대기 모양의 흑색소포가 산재한다. 3. 부화후 5일째의 자어는 전장 2.27$\~$2.49mm로 입이 최초로 열리며 동시에 난황이 완전히 흡수되어 후기자어로 이행한다.

• 한국동물위생학회지
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• 제31권1호
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• pp.93-100
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• 2008

This experiment has been investigated in order to examine the effect of ivermectin and doramectin for laval migratory inhibition in rats. Anisakis spp larvae were obtained from the mackerels in fish market in Cheongju. A total of 225 rats were classified with 3 groups with the same number ($3{\times}75$ rats); group I was control divided into 3 subgroups including 25 rats in each one, others (test groups) were treated subcutaneously with ivermectin and doramectin by 3 kinds of concentrations ($200{\mu}g/kg$, 400, 800), respectively. At 15 minutes after treating, 10 larvae were taken orally into each rat of 6 subgroups in test, and 5 rats were necropsied at 0.5, 1, 2, 4 and 8 hours after oral administration. The recovered larvae were used in larval migration inhibition (LMI). Ivermectin is significantly more effective than doramectin. In rats, the inhibitory effect of ivermectin and doramectin is slightly less than in vitro.

• 한국물환경학회지
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• 제20권3호
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• pp.265-268
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• 2004

Larva of Carassius auratus and Pungtungia herzi were exposed to mercury ($HgCl_2$), lead ($PbCl_2$) and copper ($CuSO_4$) to determine acute toxicity. The toxicity tests were conducted triplicate and the $LC_{50}$ values (24, 48, 72 and 96 hours) were determined for two species. Data obtained from the toxicity tests were evaluated using the probit analysis. Although sensitivities of two species to mercury were relatively similar, C. auratus was more susceptible than P. herzi to the exposure of lead but P. herzi was more sensitive than C. auratus on copper. The sensitivity on three metals tested may be ranked in the following order from highest to lowest toxicity on larval stage of these fish: mercury > copper > lead. It is suggested that acute toxic test at the larval stage of C. auratus and P. herzi, indigenous species in Asia area, is an important part of the ecotoxicological assessment of some heavy metals.

• 한국수산과학회지
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• 제42권1호
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• pp.56-62
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• 2009

Feeding regimens was investigated for the growth and survival rate of juvenile Maroon clownfish (Premnas biaculeatus) in order to establish a seed production technique for this fish. Three types of feeding regimens were used, and growth and survival were highest under the following regimen: rotifer from day 0, Artemia from day 4, copepod from day 9 and artificial food from day 15, respectively (P<0.05). The average body lengths of the larvae were $6.76{\pm}0.55\;mm$, $7.63{\pm}0.50\;mm$ and $7.33{\pm}0.43\;mm$ in the Nannochloropsis oculata, Isochrysis galbana and control treatments conducted with 3 larvae/L, respectively (P<0.05). There were significant differences in larval growth between the treatments and controls conducted with 6 larvae/L and 9 larvae/L, respectively (P<0.05) but there was no significant difference between the N. oculata and I. galbana treatments (P>0.05). There were no significant differences in larval growth between the treatments at densities of 3-9 larvae/L (P>0.05). At highest density level, the larvae reared in I. galbana had the highest survival rate whereas survival was lowest in the control.

• 한국어병학회지
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• 제10권1호
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• pp.65-72
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• 1997

유용 갑각류인 꽃게, 중하 및 징거미새우의 유생과 성체에 대한 황화수소의 급성독성 실험 결과로부터 이들 갑각류에 대한 독성수준, 독성순위 및 유생과 성체와의 독성차를 검토하였다. 황화수소에 대한 꽃게, 중하 및 징거미새우 유생의 96시간 반수치사농도(96hr-$LC_{50}$)는 각각 7.3, 9.3 및 $9.0{\mu}g/\ell$으로 독성순위는 꽃게>징거미새우>중하순으로 나타났다. 한편, 성체에 대한 황화수소의 96hr-$LC_{50}$값은 꽃게 $42.5{\mu}gS/\ell$, 중하 $37.8{\mu}gS/\ell$, 징거미새우 $56.6{\mu}gS/\ell$로 독성순위는 중하>꽃게>징거미새우 순으로 유생과는 다른 경향을 나타내었다. 황화 수소는 꽃게, 중하 및 징거미새우의 유생에 대하여 성체에 비해 각각 5.8, 4.1, 6.3배의 강한 독성을 나타냈다.

• 한국양식학회지
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• 제19권1호
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• pp.52-56
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• 2006

This study was conducted to investigate the effects of three different concentrations (6%, 8% and 10% final volume) of dimethyl sulfoxide (DMSO) on cryopreserved sperm of grass carp (Ctenopharyngodon idellus). Grass carp sperm was suspended in Kurokura extender #2 and equilibrated at $4^{\circ}C$ for 10 min. French straws (0.25 ml) of sperm were frozen from $4^{\circ}C\;to\;-4^{\circ}C$ at a rate of $4^{\circ}C\;min^{-1}$ and then ken $-4^{\circ}C\;to\;-80^{\circ}C$ at a rate of $11^{\circ}C\;min^{-1}$. The straws were kept at $-80^{\circ}C$ for 10 min and finally stored in liquid nitrogen $(-196^{\circ}C)$. The cryopreserved sperm was thawed in a water bath at $40^{\circ}C$ for 30 sec and fertilization, hatching rate and larval malformation were compared with fresh sperm (control). The fertilization rate of post-thawed sperm was comparable (from 88.21% to 94.30%) to that of fresh sperm. However, hatching rate of all frozen sperm were significantly lower (P<0.05) than that of control. Additionally, the larval abnormality rate of frozen sperm was significantly higher than that of fresh sperm. The results indicate that DMSO could affect the quality of cryopreserved sperm of grass carp, and a freezing program and a proper extender composition should be further studied.

• 한국어류학회지
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• 제23권1호
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• pp.37-45
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• 2011

진해만 남서부에 출현하는 자치어 종조성의 계절변동을 연구하기 위하여 2009년 1월에서 12월까지 매월 RN80 네트을 이용하여 시료를 채집하였다. 조사 기간 동안 24과 46종의 자치어가 채집되었다. 우점종은 청어(Clupea pallasii), 쥐노래미(Hexagrammos otakii), 전어(Konosirus punctatus), 멸치(Engraulis japonicus), 청베도라치(Parablennius yatabei), 앞동갈베도라치(Omobranchus elegans) 순으로 많이 채집되었는데 이들 6종은 전체 채집개체수의 92.7%를 차지하였다. 어종수, 채집 개체수, 종다양도지수는 뚜렷한 계절 변동을 나타내었다. 종수와 개체수는 각각 7월과 1월에 가장 높은 값을 나타내었다. 주성분분석(PCA)와 상관분석은 군집구조와 우점종들의 출현량이 수온과 유의한 관계가 있음을 보여주었다. 특히, 청어, 쥐노래미, 멸치, 청베도라치의 출현량은 수온과 유의한 관련성이 있었다.