• Proceedings of the Korean Society of Fisheries Technology Conference
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• 2001.10a
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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)

• Journal of fish pathology
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• v.14 no.1
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• pp.11-15
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• 2001

For the production of healthy shrimp(Penaeus chinensis, Penaeus japonicus) seedlings free from the white spot baculovirus(WSBV), we tried to disinfect shrimp eggs with iodine. A relative hatching rate of over 50% has resulted from the treatments of fertilized eggs of fresh shrimps(P. chinensis) with an effective povidon-iodine concentration of 20-200 ppm for 30 seconds and 60 seconds, respectively. The 60 sec treatment group with a 20 ppm effective povidon-iodine concentration showed nearly a 50% relative hatching rate. The over 50 ppm treatment group, however, did not result in hatching show a relative hatching rate. These hatching rates were similar to those in the fertilized eggs of kuruma prawns treated with povidon-iodine solutions. In case of washing fertilized eggs with UV-irradiated seawater 33.3% relative hatching rate in fresh shrimps was much lower than 55.2% in kuruma shrimps. Treatment fertilized eggs of 2 species of shrimp with 200 ppm iodine for 30 sec did not affect the survival rate of the larvae until the early stage of the post larvae even though the hatching rates were low. In order to produce healthy shrimp seedlings non-infected by WSBV, the shrimp eggs should be washed with UV-irradated seawater and sterilized with a low povidon-iodine concentration for a short time.

• Development and Reproduction
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• v.21 no.1
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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.

• Korean Journal of Fisheries and Aquatic Sciences
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• v.54 no.4
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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%).

• Journal of Nutrition and Health
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• v.21 no.2
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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.

• Asian-Australasian Journal of Animal Sciences
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• v.5 no.1
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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.

• Korean Journal of Microbiology
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• v.9 no.2
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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.

• Fisheries and Aquatic Sciences
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• v.14 no.4
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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).

• Journal of Aquaculture
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• v.6 no.4
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• pp.285-293
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• 1993

Gynogenetic diploid of olive flounder, Paralichthys olivaceus were induced by cold shock to fertilized eggs with red sea bream, Paragus major sperm that had been genetically inactivated with 4,800 ergs/$mm^2$ ultraviolet (UV) rays. Cold shock to the eggs at $2^{\circ}C$ for 45 minutes proved to be optimum condition to retain the second polar body. At this treatment, hatching rates of normal fry obtained were more than $33.8\%$. No different growth rates were observed up to 200 days after hatching between control and gynogenetic diploid offsprings. However, body weights of gynogenetic diploids were significantly heavier than that of control 300 days after hatching (p> 0.05). A proportion of female in gynogenetic diploid was significantly higher than that in the control (p< 0.01).

• Korean Journal of Ichthyology
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• v.32 no.1
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• pp.14-20
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• 2020

The purpose of this study is to clarify when spawning occurs of Clupea pallasii in the coastal waters of Jinhae Bay and Yeongun-ri, Tongyeong, Korea from December to February using SCUBA observation which is known as spawning season. Eighteen surveys of SCUBA diving observations have performed at 3 stations of Jinhae Bay from December 2017 to January 2018 and 24 times of survey at Yeongun-ri, Tongyeong from December 2017 to February 2018. In Jinhae Bay, average 740,274 eggs/㎡ fertilized eggs were observed in Judo Island and average 671,718 eggs/㎡ were observed in Gusan-myeon. On December 30, 2017, about 388,444 eggs/㎡ fertilized eggs were observed in Yeongun-ri, Tongyeong but no eggs were founded in next surveys. The results in this study suggest that spawning season of C. pallasii in the coastal waters of Jinhae Bay and Tongyeong begins in late December at average 7.7℃ water temperature.