• 제목/요약/키워드: Fish eggs

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TWO LATEST FISHERY-INDEPENDENT SURVEY TECHNOLOGIES

  • Lo, Nancy C.H
    • 한국어업기술학회:학술대회논문집
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    • 한국어업기술학회 2001년도 추계 수산관련학회 공동학술대회발표요지집
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    • pp.26-27
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    • 2001
  • Two sea survey instruments were introduced: continuous underway fish egg sampler (CUFES) and an airborne light detecting and ranging (LIDAR) for survey of epiplegic fish. We have used CUFES in ichthyoplankton surveys primarily for Pacific sardine (Sardinop sagax) eggs off California since 1996 and it is also being used in many parts of world for sardine and anchovy egg surveys. (omitted)

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White Spot Baculovirus(WSBV) 미감염 새우(Penaeus chinensis, Penaeus japonicus) 종묘 생산 (Production of Healthy Shrimp(Penaeus chinensis, Penaeus japonicus) Seedling Free from White Spot Baculovirus(WSBV))

  • 허문수;손상규;김종식
    • 한국어병학회지
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    • 제14권1호
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    • pp.11-15
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    • 2001
  • White Spot Baculovirus(WSBV) 미감염 새우 건강 종묘를 생산하기 위하여 난의 요오드 소독을 실시하였다. 유효 요오드농도 20,50,100,200 ppm에서 각 시험구의 대하(Penaeus chinensis) 수정난을 각각 30,60초 처리한 결과 각 농도의 30초 처리구에서는 50%이상의 상대부화율을 보였고, 60초 처리구에서는 20ppm 처리구에서만 약 50% 상대 부화율을 보인 반면 50 ppm이상에서는 부화율이 거의 없었다. 보리새우(Penaeus japoni cus)에서도 비슷한 결과를 보였다. 대하의 경우 세란만 실시한 대조구의 부화율은 33.3%이었지만, 보리새우는 55.2%로 상대적으로 높았다. 부화후 생존율을 보면 수정난의 소독으로 부화율은 낮아지지만 수정란 소독후 부화된 유생은 초기생육에는 문제점이 없었다. WSBV 미감염 건강종묘를 생산하기 위해서는 수정난을 세척하고 저농도의 요오드를 짧은 시간에 소독해야 한다.

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Constant Temperature Artificial Incubation of Spawned Eggs in Natural Nests from the Chinese Freshwater Soft-Shelled Turtle, Tryonyx sinensis Strauch(1862)

  • Oh, Young Nam;Kim, Sung Han
    • 한국발생생물학회지:발생과생식
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    • 제21권1호
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    • pp.101-110
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    • 2017
  • On June 14, 2008 (the first experiment) and July 24, 2008 (the second experiment), the shores of the Boseong River and the sandy beaches, Seokgok-myun, Moksadong-myun, Gokseong-gun in Jeollanam Province were investigated and a total of 29 soft-shelled turtle (Tryonyx sinensis) eggs in the natural spawning nest eggs were collected (13 eggs were collected in the first experiment and 16 eggs in the second experiment). The temperatures in the natural spawning nests were $25.9-36.9{\pm}0.5^{\circ}C$, the depth of the eggs was $5.2-7.5{\pm}0.5cm$ as the distance of the average $6.4{\pm}0.5cm$. 29 eggs were scattered at least 0.2 cm interval. Artificial incubation of 29 eggs was conducted in artificial nest boxes in thermo-plastic composition of the incubator, and then incubated at $26.5-35.5{\pm}0.5^{\circ}C$, and an average constant temperature was $31.2-32.1{\pm}1.0^{\circ}C$. The incubation days ranged from 53 to 55. In case of most turtles, incubation at $31^{\circ}C$ (higher temperatures) generally produces all or mostly females, while incubation at $25^{\circ}C$(cooler temperatures) produces all or mostly males. Exceptionally, in case of genus Trionyx, the sex ratio of female : male of T. sinensis of a freshwater soft-shelled turtle was approximately 1:1, which differs from other genera of turtles and makes T. sinensis Strauch only turtles presently known to lack temperature-dependent sex determination.

우리나라 연안해역 난 및 자치어의 분포특성 (Distribution of Eggs and Larvae in Coastal Waters of Korea)

  • 백정익;지환성;유효재;황강석;김두남
    • 한국수산과학회지
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    • 제54권4호
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    • pp.467-479
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    • 2021
  • The distribution and abundance of fish eggs and larvae were investigated from February to December 2020 along the coastal waters of Korea. The eggs and larvae were identified using the mitochondrial DNA cytochrome c oxidase subunit I (mtDNA COI) and 16s rRNA gene. During the study period, eggs of overall 45 taxa belonging to 26 families were collected and larvae of overall 39 taxa belonging to 23 families were collected. In Yeongil Bay, eggs of Engraulis japonicus, which accounted for 83.9% of the total population, was the most dominant species, followed by Sardinops sagax (4.0%), Repomucenus valenciennei (3.8%) and E. japonicus larvae, which accounted for 34.9% of the total population. These were followed by Sebastiscus marmoratus (31.0%). In Gomso Bay, E. japonicus eggs accounted for 61.7% of the total population, followed by Sillago japonica (14.0%), Johnius grypotus (8.8%) and Pholis fangi larvae, which accounted for 53.5% of the total population, followed by Ammodytes personatus (34.1%). In Jinhae Bay, E. japonicus eggs accounted for 86.0% of the total population, followed by Leiognathus nuchalis (4.1%), Konosirus punctatus (3.7%) and E. japonicus larvae, which accounted for 48.7% of the total population, followed by Parablennius yatabei (21.6%).

마산시 가포동의 영양섭취 실태조사 (The Nutritional Survey of Gapoe-Dong in Masan City)

  • 윤현숙
    • Journal of Nutrition and Health
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    • 제21권2호
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    • pp.122-128
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    • 1988
  • This nutritional survey was conducted from September 17 to October 6, 1984, in order to investigate the state of the nutritional intakes of perple living Gapoe-Dong, coastal area of Korea. This survey covered a total of forty houses. The method of this research was based on the interiview-survey with questinaires. All of the food taken daily by the people are all weighed before cooking ; the rest of food after mealing are also weighed. Thus the amount of food taken by people can be come out. The results were summarized as follows; 1) The average intake of all nutrients were below the RDA, especially calorie, vitamin B2, calcium and iron were insufficient. The protein intake was only 55.2g but the contribution of animal protein to total protein was adequate(38%). It was provided mostly by fish and shell-fish. 2) Chief food sources were rice, vegetables, fish and shell-fish, and milk, eggs, oil, potato, and fruits were insufficient. 3) The level of education and the number of family were significantly correlated to the nutrientintake, especially correlation between family-size and colorie, calcium intake were significant.

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PERFORMANCE OF BROILERS AND LAYERS FED LOCALLY PRODUCED FISH WASTE MEAL IN WESTERN SAMOA

  • Ochetim, S.
    • Asian-Australasian Journal of Animal Sciences
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    • 제5권1호
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    • pp.91-95
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    • 1992
  • Two experiments were conducted to evaluate the performance of broilers and layers fed locally produced fish waste meal (LFWM) in Western Samoa. LFWM, which was produced by mincing and oven drying of rejects from filleted fish, was included in both broiler and layer diets at the complete expense of imported meat and bone meal (MBM). The experiments were of a completely randomised design. In experiment 1, 120 day-old Strabro broiler chicks were raised to 49 days of ages. In experiment 2, 80 Shaver 288 pullets, 20 weeks of age, were housed in pairs in cages and raised up to 72 weeks of age. There were no differences (p > 0.05) in performance of broilers as measured in terms of final bodyweights, feed intake, feed efficiency and carcass yield between the two diets. Similarly, no differences (p > 0.05) existed in egg production, egg weight and feed required per kilogramme of eggs. It is concluded that LFWM is nutritionally as good as imported MBM and could be used to completely replace MBM in broiler and layer diets.

생선묵의 보장성에 관한 세균학적 연구 (Microbiological studies on the preservation of fish-paste products)

  • 안철우
    • 미생물학회지
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    • 제9권2호
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    • pp.47-54
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    • 1971
  • This study is concerned to the microbial population and its effects in the fish paste products. Experimental results were summarized as following orders ; 1) The number of bacteria in accordance with raw materials and coocking site waas known to as ; Wheat flor - $7.0{\times}10^8$/gram , Brayed fish meat - $2.0{\times}10^7$/gram, Cooking table - $6.1{\times}10^6$/$1.54cm^2$Chopped fish meat -$4.1{\times}10^6$/gram, Wooden plate - $5.5{\times}10^5$/218.32cm, Sodium chloride - $8.8{\times}10^4$/gram, Wheat starch - $4.5{\times}10^4$/gram, Fish meat - $2.3{\times}10^4$/gram. However, there were a few bacterial numbers less than 300 per gram of raw materials, such as monosodium glutamate, tap water, sugar, saccharine and eggs. 2) Bacterial population in the raw materials might be changed according to the conditions of preservation. 3) When the heat tratment is used for the preservation, the thermal effects were rarely found at the interior part of fish paste products. Conduction of heat into the interior part dose not rise about $84^{\circ}C$ and the survival of bacteria could be possible under the condition. Therefore, cooking being used requires further studies. 4) Number of bacteria in the fish paste products sold in the market was higher on April and May than those on June. Especially on June, the number of bacteriz in the interior part were found higher than those in the exterior part of the products.

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Sexual Maturity and Early Life History of the Mudskipper Scartelaos gigas (Pisces, Gobiidae): Implications for Conservation

  • Kim, Jin-Koo;Baek, Hea-Ja;Kim, Jae-Won;Chang, Dae-Soo;Kim, Joo-Il
    • Fisheries and Aquatic Sciences
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    • 제14권4호
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    • pp.403-410
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    • 2011
  • Scartelaos gigas is an amphibious mudskipper species that inhabits mud flats in Korea, China, and Taiwan. This fish is at risk of extinction because of its very restricted habitat and overexploitation. Information about this fish's reproductive characteristics is needed for species conservation. The sexual maturity and early life history of S. gigas were investigated through histological methods and direct observation of eggs in the wild, respectively. In total, 560 individuals of S. gigas were collected with the aid of fishermen from March 2003 to October 2003 at Jung-do Island, southwest Korea. Through microscopic observations of gonadal development, it was determined that S. gigas of both sexes were immature in April, but began to reach maturity in May, and were then fully mature by June, which was maintained until July. In August, some female fish developed early oocytes, but by September oocytes were observed to have degenerated and had been absorbed. Spawned eggs were elliptical and had an average size of 1.37 mm (long axis) by 0.69 mm (short axis). The newly hatched larvae (3.03 mm total length, TL) had an open mouth and anus, two melanophores near the anus, and one large melanophore between the 18th and 19th myomeres. The larvae (3.18 mm TL) showed absorption of the yolk and oil globule within 5 days after hatching and became prelarvae. This species should be considered vulnerable or conservation-dependent, and thus parental fish need to be protected from fishermen during the main spawning season (June).

넙치 전 암컷 집단의 생산을 위한 연구 I. 자성발생성 이배체 유도 및 성장 (Studies on the Production of All-Female Populations of Olive Flounder, Paralichthys olivaceus I . Induction of Gynogenetic Diploid and Its Growth)

  • 김윤;김경길;방인철;이종관
    • 한국양식학회지
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    • 제6권4호
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    • pp.285-293
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    • 1993
  • 넙치 양식의 생산성을 높이는 방법의 일환으로 수컷에 비해 성장이 빠른 암컷만의 생산을 위하여 먼저 참돔 정자를 이용한 자성발생성 이배체의 유도 조건, 성장, 생존율 및 성비를 조사하였다. 그 결과 자성발생성 이배체 넙치는 $4,800ergs/mm^2$의 자외선으로 불활성화 시킨 참돔 정자와 성숙된 넙치 난을 인공 수정시켜 수정 후 3분부터 수온 $2^{\circ}C$에서 45분 동안 제 2극체 방출의 억제에 의하여 유도되었다. 유도된 자성발생성 이배체의 성장과 생존율은 부화후 200일째까지는 대조군과 유의차가 없었으나, 부화후 300일째는 자성발생성 이배체의 성장이 대조군보다 양호하였다. 또한 자성발생성 이배체의 암컷 비율은 $92.1\%$로 대조군의 $43.6\%$에 비하여 월등히 높았다.

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잠수관찰을 통한 경남 진해만과 통영 연안 청어 Clupea pallasii의 산란기 추정 (Estimation of Spawning Season of Clupea pallasii in the Jinhae Bay and Coastal Waters of Tongyeong in Gyeongnam Using Scuba Observation)

  • 이용득;이강민;박종율;곽우석
    • 한국어류학회지
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    • 제32권1호
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    • pp.14-20
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    • 2020
  • 이번 연구는 산란기로 알려진 12월부터 2월까지 경남 진해만과 통영 연안에서 잠수조사를 통해 산란회유하는 청어의 산란기를 명확히 밝히는 데 목적이 있다. 경남 진해만에서 2017년 12월부터 2018년 1월까지 3개의 정점에서 총 18회, 통영 영운리 연안에서는 2017년 12월부터 2018년 2월까지 총 24회 잠수조사를 통해 결과를 분석하였다. 조사기간 중 확인된 청어 수정란은 진해만 저도 연안에서 평균 740,274개/㎡, 진해만 구산면 연안에서는 평균 671,718개/㎡였다. 통영 영운리 연안에서는 2017년 12월 30일에 388,444개/㎡개의 수정란이 1회 관찰되었고 그 이후 조사에서는 관찰되지 않았다. 이번 연구결과 경남 진해만과 통영 연안에서 청어 산란은 12월 말에 시작되고 이때의 수온은 평균 7.7℃였다.