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이덕찬,원경미,박명애,최혜승,정승희 한국해양수산개발원 2018 해양정책연구 Vol.33 No.1
This study analyzed cases of mass mortality in fish farms located in the south coasts of Korea from 1998 to 2016 to help minimize damage to fisheries. Reports and documents on damage investigation from the National Institute of Fisheries Science (NIFS) were used for the study. During this period, 148 cumulative analyses were conducted for 1,445 cases totally, including 1,367 cases of marine cage aquaculture farms (94.6%), 77 cases of onshore aquaculture farms (5.3%), and 1 case of enclosure aquaculture farms. The number of annual damage investigations and damaged fish farms tended to increase rapidly after 2011. The causes of mass mortality of cultured fishes included harmful algal blooms (HABs, 37.4%), high water temperature (31.0%), and low water temperature (26.5%), altogether accounting for approximately 95% of the total incidences of fishery damage. Apart from the three major causes, other causes included biological diseases (1.6%), blue tide (0.6%), nutrition and nutritional diseases (0.3%), and unidentified causes (1.6%). However, most of the mass mortality cases could not be clearly attributed to a single cause; however, other causative factors were also considered to be involved before or during mass mortality. Additionally, the majority of the mass-mortality cases occurred between January and March and between July and October, representing periods of low and high water temperature, respectively. Therefore, fishery-damage prevention programs suitable for such characteristics of Korea should be developed. These programs should include transformation of social awareness, improvement of the system, preparation against global warming, management of aquaculture environments, improvement of fishery systems, management of fish farms, and control of nutrition status and diseases. 본 연구는 1998년부터 2016년까지 우리나라 남해안에 위치한 어류양식장에서 발생한 대량폐사 사례를 분석함으로서 어업피해의 최소화에 기여하고자 수행하였다. 분석을 위한 자료는 국립수산과학원의 피해 조사 관련 보고서와 문서를 이용하였다. 이 기간 동안 누적하여 148회의 조사를 수행하였으며, 가두리양식장 1,367개소(94.6%), 육상수조식양식장 77개소(5.3%) 및 축제식양식장 1개소 등 1,445개 양식장에 대한 피해조사 사례를 분석하였다. 연간 피해조사 회수와 피해 양식장수는 2011년 이후 급격히 증가하는 경향을 보였다. 양식어류의 대량폐사 원인은 HABs(37.4%), 고수온(31.0%), 저수온(26.5%)의 순이었으며, 이들 원인에 의한 어업 피해 양식장 수는 전체 피해 발생건수 대비 약 95%에 해당하였다. 위의 3개 원인 이외에 생물학적 원인에 의한 질병(1.6%), clear water(0.6%), 영양 및 영양성 질병(0.3%) 등이 있었으며, 명확하게 원인이 밝혀지지 않은 경우도 1.6% 이었다. 그러나 대부분의 대량폐사 사례에서 명확하게 1개의 원인에 의한 피해는 드물었으며, 폐사가 발생하기 이전 또는 폐사 기간 중에 다른 원인 인자가 관여했을 것으로 판단되었다. 뿐만 아니라 대량 폐사의 대부분이 1~3월과 7~10월, 즉 저수온 시기와 고수온 시기에 발생하는 것으로 조사되어 우리나라 특성에 적합한 어업피해 예방 프로그램의 개발이 필요할 것으로 사료된다. 이 프로그램에는 수산업과 관련한 사회적 인식의 전환과 제도의 개선, 지구온난화에 대한 대응과 양식 환경의 관리, 어류 양식 시스템의 개선과 양식장 관리, 영양 및 질병의 관리 등이 포함되어야 할 것이다.
이덕찬,한지도,김근용,전미애,김다운,박혼,김병학 한국패류학회 2021 The Korean Journal of Malacology Vol.37 No.3
The mitochondrial genome (mitogenome) of the invasive and harmful polychaete species, Polydora hoplura (Annelida), was analyzed by next generation sequencing (NGS). Its mitogenome was found to be 17,597 bp in length, comprising 13 protein-coding genes, two ribosomal RNA genes, and 23 transfer RNA genes, with one additional trnM gene. The gene composition and order of P. hoplura were distinct from those of polychaetes and even differed from those of Marenzelleria neglecta belonging to the same family, Spionidae.
이덕찬,이재일,김도형,조미영,김진우 한국어병학회 2011 한국어병학회지 Vol.24 No.3
Starry flounder, which are recently increasingly cultured in Korea, are known to highly vulnerable to Streptococcus parauberis infection. Five groups of starry flounder (n=30 for each group) were vaccinated with S. parauberis formalin-killed whole cells by intraperitoneal injection at a final concentration of 0, 0.01, 0.1, 1 and 10 mg fish^(-1). Specific antibody production of 1 and 10 mg fish^(-1) administered groups significantly increased at four weeks post immunization. All vaccinated groups showed higher survival rates than a control group when five groups of fish were challenged with S. parauberis at a dose of 1.14×10^4 cfu fish^(-1) and 1.14×10^2 cfu fish^(-1), respectively. In articular, 0.1 or higher concentrations of formalin killed bacterial cells are able to confer the fish high protection against S.parauberis infection.
이덕찬,김근용,한지도,김다운,김병학 한국패류학회 2020 The Korean Journal of Malacology Vol.36 No.4
In this study, 30 polychaete samples were isolated from abalone shells, and genetic classification was performed using them. The DNA sequences corresponding to the polychaete 18S rDNA and 16S rDNA or mitochondrial cytochrome c oxidase I (CO1) regions were decoded, and the types were identified through BLAST search of NCBI. As a result of confirming the nucleotide sequence, genetic diversity was analyzed for 27 samples that were translated into ‘Annelida’, and 16 samples were identified as Polydora hoplura. In addition, Annelids such as Amphisamytha vanuatuensis, Amythas membranifera, Cirriformia chicoi, Cirratulus cirratus, Hediste spp., Notophyllum japonicum, Phyllodoce rosea, Syllis armillaris, and Terebella lapidaria have been identified. In the future, it is expected that various studies on several types of Annelids identified in abalone farms as well as continuous research on P. hoplura are needed.