• Title, Summary, Keyword: Rockfish

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Comparison of Xenobiotic Metabolism and Antioxidative Status in Cultivated and Stocked Rockfish Sebastes schlegeli (양식산과 방류산 조피볼락(Sebastes schlegeli)의 간장 중 해독 및 항산화 효소계의 비교)

  • Lee, Ji-Seon;Byun, Hee-Guk;Jeon, Joong-Kyun
    • Korean Journal of Fisheries and Aquatic Sciences
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    • v.45 no.2
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    • pp.97-103
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    • 2012
  • This study compared the composition and texture of muscle and levels of detoxification and antioxidant enzymes in the livers of stocked and cultivated rockfish Sebastes schlegeli released after the primary culture stage in Tongyoung, South Korea. The crude lipid content of muscle was significantly higher ($P$<0.05) in cultivated rockfish than stocked rockfish, while the texture did not differ significantly ($P$>0.05). The condition factor (CF) and hepatosomatic index (HSI) did not differ significantly and the growth of stocked and cultivated rockfish was similar. The levels of the detoxification enzymes cytochrome P450 (CYP) and Ethoxyresorufin-O-deethylase (EROD) were significantly lower in the livers of stocked rockfish, perhaps because of their reduced exposure to xenobiotic compounds. In addition, stocked rockfish had a significantly ($P$<0.05) lower CAT and higher GR than cultivated rockfish, but similar levels of tGPx, SOD, GSH, and GSSG. The present study shows that the growth rates of stocked and cultivated rockfish are similar and that stocked rockfish are exposed to fewer xenobiotic compounds and less oxidative stress.

Activities of non-specific defense factors in cultured oblong rockfish(Sebastes oblongus) and rockfish(S. schlegeli) (양식 볼락류에서 비특이적 방어인자의 활성)

  • Kim, Jin-Do;Byun, Soon-Gyu;Park, Sung-Woo;Kim, Eun-Heui
    • Journal of fish pathology
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    • v.21 no.3
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    • pp.247-257
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    • 2008
  • To understand the activity of non-specific defence factors in cultured Sebastes, the antibacterial effect of the serum, skin mucus and homogenate of various organs from cultured oblong rockfish (Sebastes oblongus) and rockfish(Sebastes schlegeli) against pathogenic bacteria, Aeromonas hydrophila, Edwardsiella tarda, Vibrio anguillarum, and Streptococcus sp. was compared with that of flounder(Paralichthys olivaceus) and seabass(Leteolabrax japonicus). And the activities of proteolytic enzyme, chitinolytic enzyme and haemolycin as non-specific defence factor were investigated on the oblong rockfish and rockfish. Samples from oblong rockfish showed the highest antibacterial activity by lysoplate assay on agar plate mixed with pathogens, followed in descending order by rockfish, seabass, and flounder. Turbidimetric assay was carried to evaluate the lysozyme activity of fish samples against lyophilized cells of Micrococcus lysodeiktikus. The serum, kidney, liver, stomach, intestine and eyeball of oblong rockfish and the mucus and gill of rockfish appeared to have the highest lysozyme activity among the fish strains investigated. All samples except skin mucus, liver, and eyeball of oblong rockfish and rockfish showed proteolytic enzyme activity. Chitinolytic enzyme activity was showed in random sampling and haemolytic activity was remarkable in oblong rockfish. Therefore, Sebastes strain was proved to have effective defense mechanisms based on the antibacterial activities, and lysozyme, proteolytic enzyme, chitinolytic enzyme, and haemolycin were considered to act as the non-specific defence factor of Sebastes.

The Causality and Volatility Spillover between Farming fish Species in Consumption Replacement Relation (소비 대체 양식어종 간의 가격 인과성과 변동성 전이에 관한 연구)

  • Kang, Seok-Kyu
    • The Journal of Fisheries Business Administration
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    • v.46 no.3
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    • pp.119-127
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    • 2015
  • This study is to analyse the causality and volatility spillover between farming fish species in consumption replacement relation using flatfish(oliver flounder) and rockfish's wholesale market price data from September 2006 to July 2015. For the analysis, VAR(5) model and bivariate asymmetric GARCH-BEKK model are employed. The empirical results of this study are summarized as follows: First, the price volatility of flatfish and rockfish is very large without the trend during the sample period. Second, the correlation coefficient between flatfish and rockfish wholesale markets has positive 0.1059 value. Third, causality relation is unidirectional from rockfish market to flatfish market. Fourth, conditional volatility spillover effect is unidirectional from rockfish market to flatfish market, but asymmetric volatility effect is bidirectional between flatfish and rockfish markets that implies the bad news arising from flatfish wholesale market impact on rockfish market's volatility and the bad news arising from rockfish wholesale market impact on flatfish market's volaltilty. Consequently, based on the thus results, the volatility spillover effect interacts and is bidirectional between flatfish and rockfish wholesale markets.

Birth Ecology and Food Proceeding of Larvae in Red Marbled Rockfish, Sebastiscus tertius (붉은 쏨뱅이, Sebastiscus tertius의 출산생태와 먹이계열)

  • 김광수;임상구;김철원;정장환
    • Journal of Aquaculture
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    • v.12 no.4
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    • pp.309-315
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    • 1999
  • In order to understand the initial feeding time of larvae red marbled rockfish, Sebastiscus tertius changes of mouth size were investigated. Also, the fecundity of different size of red marbled rockfish broodstocks was measured. The broodstocks of red marbled rockfish, S. terius of $32.3\pm6.52 cm$ and larger than 45cm in total length spawned 296,648 and 600,000 larvae, respectively. About 50% was normal healthy larvae among the spawned ones. Mouth sizes calculated by the angle mouth opening and upper jaw length for newly spawned red marbled rockfish larvae were 0.263, 0.197 and 0.132 mm at D, 0.75D and 0.5D, respectively, when the upper jaw length was 0.186mm. Thereafter, 20 days old larvae showed 0.822, 0.617 and 0.411 mm in calculated mouth length at D, 0.75D and rockfish larvae grows, their upper jaw length gradually increased. 2 days old red marbled rockfish larvae possibly stated to feed rotifers and lasted their feeding for the another 35days, relatively long periods compared with other larvae fish. And 25 days old larvae possibly fed the newly hatched Artemia nauplii and lasted their feeding for the another 20 days, like other larvae fish. The proper supplying time of artificial feeds for the red marbled rockfish larvae seemed to be around 10 days after spawning.

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Effects of Dietary Inclusion of Distillers Dried Grain as a Partial Replacement for Fish Meal on Growth Performance of Juvenile Rockfish Sebastes schlegeli (배합사료의 어분 대체원으로 막걸리부산물 첨가가 조피볼락 치어의 성장에 미치는 영향)

  • Bae, Ki-Min;Lee, Sang-Min
    • Journal of Fisheries and Marine Sciences Education
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    • v.27 no.2
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    • pp.390-398
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    • 2015
  • A feeding experiment was conducted to determine the use of distillers dried grain (DDG) as a partial replacement for fish meal in the diet for juvenile rockfish, Sebastes schlegeli. Four iso-nitrogenous (50% crude protein) and iso-caloric (4.3 kcal/g) diets (designated as DDG0, DDG7, DDG14, and DDG21) were formulated to contain 0, 7, 14, and 21% DDG. Triplicate groups of juvenile rockfish (initial body weight, $10.2{\pm}0.2g$) were fed one of the experimental diets to visual satiety twice a day (09:00 and 17:00) for 8 weeks. At the end of the feeding trial, survival of rockfish was above 97% and not affected by dietary DDG levels (P>0.05). Weight gain, feed efficiency and daily feed intake of juvenile rockfish were significantly decreased with increase of dietary DDG levels (P<0.05). Condition factor, hepatosomatic index and visceralsomatic index of juvenile rockfish were not significantly affected by dietary DDG levels (P>0.05). No significant differences were observed in the contents of moisture, crude protein, crude lipid and ash of the whole body and dorsal muscle in juvenile rockfish fed the experimental diets (P>0.05). Therefore dietary inclusion of DDG as a replacement for fish meal could depress the growth of juvenile rockfish.

Infestation Status of Parasitic Copepod, Clavella adunca (Strom) on Black Rockfish, Sebastes melanops

  • Chun, Kae-Shik
    • Korean Journal of Environmental Biology
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    • v.20 no.4
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    • pp.300-302
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    • 2002
  • The occurrence and infection level of parasitic Copepod, Clavella adunca on the black rockfish, Sebastes melanops at the Hatfield Marine Science Center Aquarium were studied. C. adunca was usually found on the base of fins, preferably on the pectoral fins. Seven specimens of black rockfish, Sebastes melanops were collected from Oregon Coast Aquarium. Copepods of ten Clavella adunca were present as ectoparasites attached to the fins in the black rockfish. The prevalence and relative density of Clavella adunca were 28.6% and 1.4 respectively. It is considered that the tissue of the fin membrane offers the most favorable conditions toy the attachment of C. adunca.

Water Temperature, Rearing Density and Feeding Rate on Growth and Survival Rate of Red Marbled Rockfish, Sebastiscus tertius Larvae (수온, 자어밀도 및 먹이공급량에 따른 붉은쏨뱅이, Sebastiscus tertius 자어의 성장과 생존율)

  • 허성범;임상구;김철원;김광수
    • Journal of Aquaculture
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    • v.12 no.3
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    • pp.213-220
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    • 1999
  • This study was performed to investigate the effects of water temperature and stocking density and rotifer density on the mass production of larval red marbled rockfish, Sebastiscus tertius. Total length of the marbled rockfish larva grown in $23^{\circ}C$ of water temperature were 10.80mm, which was the best, while those grown in $29^{\circ}C$ of water temperature were 6.28mm, which was the lowest. The survival rates of red marbled rockfish larvae grown in $20^{\circ}C$ and $23^{\circ}C$ were 24.0% and 18.5%, respectively. However, the survival rate of red marbled rockfish larvae grown in $26^{\circ}C$ was $7^{\circ}C$ and no larvae survived in $29^{\circ}C$. The total length of red marvled rockfish larva stocked at the density of 5 and 10 larvaper liter of water were high, which were 11.52 mm and 11.22 mm, respectively, but those stocked at the density of 30 larva per liter of water were 7.55mm, which was the lowest. The survival rate of red marbled rockfish larva stocked at the density of 2.5 larva per liter of water was 52.0%, which was the best, but the lowest, 18.0% for the red marbled rockfish larva stocked at the density of 30 larva per liter. There was a trend toward decrease in survival rate of red marbled rockfish larva as their stocking density increased. The survival rates of red marbled rockfish larva fed rotifers at the density of 10 and 5 individuals per ml were high, 48.5% and 48.0%, and their total lengths were 11.92 and 11.89mm, respectively, which grew relatively fast. The survival rate and the total length of red marbled rockfish larva fed rotifers at the density of 30 individuals per ml were the lowest, which were 8.40mm and 21.5%, respectively. Also, red marbled rockfish larva fed rotifers at the density of more than 20 individuals per ml achieved poor survival and growth. These results indicated that the proper conditions for the mass production of larval red marbled rockfish were $23^{\circ}C$ of water temperature, fish larva stocking density of 5 to 10 larva per liter of water and rotifers density of 5 to 10 individuals per ml as live feed.

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A Study on the Improvement of Profitability in the Marine Fish Culture Business (해수어류양식업의 수익성 제고방안)

  • 정신작;진상대
    • The Journal of Fisheries Business Administration
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    • v.28 no.2
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    • pp.39-66
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    • 1997
  • The objective of this study is to suggest the improvement method of the profitability in our marine fish culture business. So I investigated the actual condition for aquaculture farms in South Sea coast by the question and actual survey. 1 recognized the following facts; 1) The marine floating netcage system are a great portion in two province - Kyeongnam and Cheunnam, 2) The rockfish are reared absolutely much more than the olive flounder, 3) The polyculture by various species are more carried out than the monoculture of the olive flounder or rockfish, etc. I analyzed the profitability in olive flounder monoculture, rockfish monoculture, olive flounder and rockfish polyculture, and rockfish polyculture taking turns year by year respectively. At a result I comfirmed that the net income to net sales was the highest in the olive flounder monoculture bacouse the olive flounder,s sale price was higher than rockfish price. But internal rate of return(IRR) and net present value(NPV) were high in the olive flounder and rockfish polyculture or the rockfish taking turns polyculture. The reasons were alttributed to their high utility of a netcage and to reduction of a capital cost. So, I suggest 1) to feed the bigger product in short term, 2) to reduction of a feed and seed cost, 3) to increase a survival rate of fish and 4) to enlarge production by highly utilizing a netcage. And I recognized that a aquaculture manager should make constantly an effort to gain more profit by rearing more good products and by reducing a production cost.

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Molecular cloning and expression of black rockfish Sebastes schlegelii p47-phox (neutrophil cytosolic factor 1)

  • Kim, Ki-Hyuk;Baeck, Gun-Wook;Kim, Mu-Chan;Park, Chan-Il
    • Journal of fish pathology
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    • v.22 no.2
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    • pp.137-146
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    • 2009
  • The black rockfish Sebastes schlegelii neutrophil cytosolic factor components p47 phox (phagocyte oxidase) cDNA was cloned. The sequence of the cDNA showed that rockfish p47 phox cDNA consisted of 1,952 bp contained open reading frame encoding predicted polypeptide of 420 amino acids. Additionally analysis of the p47 phox amino acid sequence showed two potential SH3 domains. The functional domains are highly conserved in many animals, though the sequence of the components of the black rockfish showed low homology with that of mammals. The deduced amino acid sequence of the black rockfish p47 phox was similar to those of the carp (60.4%), zebrafish (59,2%), rainbow trout (68.5%), xenopus (55.2%), mouse (54.2%), rabbit (54.5%), rat (53.7%), and chicken (50.9%). The expression of the rockfish p47 phox molecule was induced in peripheral blood leukocytes (PBLs) from 1 to 12 h following LPS stimulation, with a peak at 6 h after the stimulation, and which increased at 1, 3, and 12 h after treated with Poly I:C compared with the control. The rockfish p47 phox gene was expressed in various tissues of healthy fish. The level of p47 phox expression was high in the PBLs, kidney and spleen.

Comparative Health Extents of Korean Rockfish, Sebastes Schlegeli by the Commercial extruded Pellet and Moisture Pellet Administration (해상가두리 양식장에서 배합사료 및 생사료 투여에 의한 조피볼락, Sebastes schlegeli 건강도)

  • Choi, Hye-Sung;Huh, Min-Do;Son, Maeng-Hyun;Kim, Kang-Woong;Kim, Kyoung-Duck
    • Journal of Fisheries and Marine Sciences Education
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    • v.25 no.6
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    • pp.1315-1323
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    • 2013
  • The purpose of this research is to evaluate the effects of a commercial mixed extruded pellet(EP) and raw fish moist pellet(MP) diet on diseases prevalence and serological constituents and HSI of korean rockfish, Sebastes schlegeli grown in two commercial-scale aquaculture farms from June to December in 2009. The growth of MP-fed rockfish was slightly faster than EP-fed rockfish during experimental period, but did not show significant differences. The levels of TCHO, TG, Glucose and TP in the MP-fed rockfish group were higher than those of EP-fed group, whereas there was no significant difference in other biochemical factors of blood between two groups. In addition, bacteria and virus were not detected in both MP- and EP-fed rockfish groups, and the infection rates of gill fluke between two groups did not show clear difference. In conclusion, there was no comparable difference in growth and the health extents of one year rockfish by administration of the commercial mixed extruded pellet(EP) and raw fish moist pellet(MP) diets.