• Journal of the Korean Society of Fisheries and Ocean Technology
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• v.50 no.2
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• pp.139-146
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• 2014

Feeding habits of white croacker, Pennahia argentata, were analyzed by using the stomach contents of 153 specimens caught by bottom trawl from May 2011 to March 2012 in the Sejon island, Korea. To know feeding habits of the white croacker, P. argentata, a species composition and it's fluctuation were analyzed based on growth. White croacker, P. argentata caught in the area composes 15 species. The most species in an number of the prey was Macrura which was occupied at 66.4% from whole prey, the second most species was Pisces which was occupied at 20.3%. The most species in an wet-weight of the prey was Pisces which was 49.3% out of the whole specimens. The second most species was Macrura which was 43.3%. The frequency occurrence of the prey was Macrura which was 68.6%, the next one was Pisces which was 28.8%. The highest Index of Relative Importance (IRI) of the prey was Macrura which was 78.2%, the next one was Pisces which was 28.8%. A number of the prey per specimen of small, middle and large class were 1.3, 1.5, 1.7, respectively. A wet weight of the prey per specimen of small, middle and large class were 0.2, 0.6, 0.2 g, respectively.

• Fisheries and Aquatic Sciences
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• v.11 no.3
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• pp.125-132
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• 2008

The development of a fish that functionally provides both antioxidant and fat-reducing effects is an important goal in nutrition and aquaculture research. Dietary conjugated linoleic acid(CLA) can be successfully incorporated in fish muscle and viscera, but CLA and carotenoids have not been evaluated in such fish. An 8 weeks growth trial was conducted using rainbow trout, and all fish were fed twice daily with experimental diets containing graded amounts of CLA(1% and 5%). At the end of the experiment, the daily growth index, feed conversion rate, lipid class, and fatty acid composition were determined. Dietary CLA did not enhance the growth parameters of rainbow trout but did improve the feed conversion rate. The muscular polar lipid content decreased during the feeding period, while the content was stable in the viscera. In addition, a diet high in CLA decreased the polyunsaturated fatty acid content, but had no effect on the content of monounsaturated and saturated fatty acid in muscle.

• Ocean and Polar Research
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• v.28 no.3
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• pp.225-236
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• 2006

Seagrass meadows are considered as critical habitats for a wide variety of marine organisms in coastal and estuarine ecosystems. In many cases, studies on the spatial/temporal distribution of seagrass have depended on direct observations using SCUBA diving. As an alternative method fur studying seagrass distribution, an application of hydroacoustic technique has been assessed for mapping seagrass distribution in Dongdae Bay, on the south coast of Korea, in September 2005. Data were collected using high frequency transducer (420 kHz split-beam), which was installed with towed body system. The system was linked to DGPS to make goo-referenced data. Additionally, in situ seagrass distribution has been observed using underwater cameras and SCUBA diving at four stations in order to compare with acoustic data. Acoustic survey was conducted along 23 transects with 3-4 blot ship speed. Seagrass beds were vertically limited to depths less than 3.5m and seagrass height ranged between 55 and 90cm at the study sites. Dense seagmss beds were mainly found at the entrance of the bay and at a flat area around the center of the bay. Although the study area was a relatively small, the vertical and spatial distributions of the seagrass were highly variable with bathymetry and region. Considering dominant species, Zostera marina L., preliminary estimation of seagrass biomass with acoustic and direct sampling data was approximately $56.55g/m^2$, and total biomass of 104 tones (coefficient variation: 25.77%) was estimated at the study area. Hydroacoustic method provided valuable information to understand distribution pattern and to estimate seagrass biomass.

• Journal of the Korean Society of Food Science and Nutrition
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• v.40 no.1
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• pp.14-19
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• 2011

In this study, we extracted a whole polysaccharide fraction from the sea hare, Aplysia kurodai, and screened its functional properties using cell lines. The functionalities of polysaccharide and glycosaminoglycan (GAG) were investigated with RAW 264.7 cell lines. The crude polysaccharides and GAG purified DEAE-Sepharose chromatography did not show the toxicity on RAW 264.7 cell line in the range of $10\sim200{\mu}g$/mL, whereas they increased the cell growth rate. The crude polysaccharides and purified GAG also increased the production of NO, interleukin-6 and tumor necrosis factor-$\alpha$ on RAW 264.7 cell. Particularly, the purified GAG inhibited the proliferation of stomach cancer cell line, AGS, up to 40% for 72 hr incubation, but not the intestinal epithelial IEC-6 cell lines.

• Korean Journal of Fisheries and Aquatic Sciences
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• v.48 no.1
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• pp.16-25
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• 2015

This study compared the food quality of salmonid fishes according to the species, country of origin, and separated part, such as fillet and frame. The proximate composition of chum salmon from Norway (CS-N) was 74.4% moisture, 19.5% crude protein, 4.2% crude lipid, and 1.2% ash. These values were within roughly 1% for the other salmon species. There was no significant difference (at P<0.05) in the Hunter a value of salmon muscle according to sepatated parts. However, there was a significant difference (P<0.05) in Hunter a value of salmon muscle according to the species and country of origin. There were significant differences in odor intensity and hardness of the salmon according to the species. The major free amino acid in all of the salmon muscles was anserine, which ranged from 61.3 to 73.0%. The taste value was the highest for salmon imported from Alaska (CS-A), followed by pink salmon, CS-N, and muscle separated from the frame (AS-C). In the taste value of all salmon muscles, the major amino acid was glutamic acid. The total amino acid content of salmon muscles ranged from 18.36 to 19.64 g/100 g, and the major amino acids were glutamic acid and aspartic acid. There were differences in the mineral contents, including Ca, P, K, and Fe, and fatty acid composition of salmon muscle according to species.

• Korean Journal of Fisheries and Aquatic Sciences
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• v.48 no.1
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• pp.26-35
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• 2015

This study compared the meat quality of sea rainbow trout Oncorhynchus mykiss frame muscle (S-FR-TY) and fillet (S-FI-TY) with the frame muscle of freshwater rainbow trout (F-FR). There was a difference of < 1% in the proximate composition of S-FR-TY vs. S-FI-TY, and of S-FR-TY vs. F-FR. The Hunter a value of F-FR-TY was lower compared with that of F-FR cultured in Jecheon (F-FR-JC), but higher than that of F-FR cultured in Pyeongtaek (F-FR-PT). However, no difference in the Hunter a value of S-FR-TY compared with any other F-FR was observed. The odor intensity of S-FR-TY was lower compared with that of F-FR, while the taste of S-FR-TY was milder than that of S-FI-TY, but stronger than that of F-FR. Although its total amino acid content was lower, the essential amino acid content of S-FR-TY was higher compared with S-FI-TY; the potassium content of S-FR-TY was also significantly greater. S-FR-TY contained high levels of nutritional and functional components, such as anserine, lysine, threonine, and eicosapentaenoic and docosahexaenoic acid. These results suggest that S-FR-TY could be used as a resource of canned food or fish jerky for children.

• Korean Journal of Fisheries and Aquatic Sciences
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• v.46 no.3
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• pp.245-251
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• 2013

This study was conducted to compare quality characteristics of imported skate rays. The moisture content was higher in imported skate rays than in domestic mottled skate, while the protein content displayed a contrasting pattern. From measurements of the volatile basic nitrogen content, pH, viable cell counts, and urea and ammonia contents, the freshness of skate rays imported from Chile, Canada and Uruguay was considered to be inferior to domestic mottled skate, while the freshness of skate rays imported from the USA was similar. The measurement of physicochemical properties revealed that four kinds of imported skate rays were of inferior quality, as compared to domestic mottled skate.

• Korean Journal of Fisheries and Aquatic Sciences
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• v.56 no.6
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• pp.773-780
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• 2023

This study was conducted to prepare curry potato pancakes (CPP), curry fish balls (CFB) and steamed eggs (SE) using Pacific saury Cololabis saira as senior-friendly seafood and to determine the physical property stages and quality characteristics of the prepared food. Escherichia coli concentrations were undetected in all the products, which is considered an acceptable limit for senior-friendly foods. On applying the physical properties standards according to the Korean Industrial Standard, saury CPP, saury CFB, and saury SE were classified as the 1^st, 2^nd, and the 3^rd stages as senior-friendly seafood, respectively. Regarding the nutritional properties per 100 g of the three types of senior-friendly seafood using saury according to the Korean food code, CPP had three types of nutrients (protein, riboflavin, and niacin), whereas CFB and SE had four (protein, riboflavin, niacin and calcium) and six (protein, vitamin D, vitamin C, riboflavin, niacin, and calcium) types of nutrients, respectively.

• Proceedings of the Korean Society of Fisheries Technology Conference
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• 2003.05a
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• pp.225-226
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• 2003

Catfish (S. asotus) and bullhead (P. fulvidraco), economically important aquacultural species, belonging to order Siluriformes including two family Siluridae and Bagridae, respectively, are considered to be closely related to each other by various authors. Two fish species widely inhabit the slow river and stream that flows to the West Sea and South Sea in the Korean Peninsula. (omitted)

• Corrosion Science and Technology
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• v.7 no.2
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• pp.125-129
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• 2008

Results of corrosion testing for different grades of titanium, copper, zinc, alluminium alloys and steels after two years of outdoor exposure under humid tropical urban and marine conditions have been presented and discussed. Mass loss and corrosion product characteristics for the exposed specimens at Hanoi testing site with high humidity and Nhatrang marine stations (at 100 and 1,000 meters distances from sea) with different airborne salinities (35.9 and $90.0mg/m^2.d$ respectively) have been selected for investigation. From time dependence of the specimen mass loss and corrosion product characteristics, the strong influence of environmental parameters upon durability for the investigated metals and alloys has been demonstrated. Only titanium alloys show high resistance to the marine conditions. All the other specimens (copper, zinc, alluminium alloys and steels) have been underwent strong deterioration under influence of aerosol salinity. Results of corrosion products analysis have been also presented for characterization of environmental impact on the metal degradation processes.