• Title/Summary/Keyword: black rockfish

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Regulation of Copulation and Parturition in Black Rockfish, Sebastes Schlegeli by Photoperiod and Temperature (광주기와 수온에 의한 조피볼락, Sebastes schlegeli의 교미 및 출산 조절)

  • Park, Moo-Eog;Rho, Sum;Byun, Soo-Cheol;Lee, Chi-Hoon;Baek, Hea-Ja;Lee, Young-Don;Kim, Hyung-Bae
    • Journal of Aquaculture
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    • v.14 no.3
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    • pp.173-180
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    • 2001
  • Regulation of copulation and parturition of black rockfish, Sebastes schlegeli were induced by artificially controlled photoperiod and temperature. for the treated group, daylength of copulation and parturition period was maintained at 9L : 15D and 14L : l0D, respectively. Temperature was maintained at 12~13$^{\circ}C$ during the copulation period, and at 14~15$^{\circ}C$ during the parturition period. Gonadosomatic index (GSI) of male was low 0.12 from January to August and peak to 1.36~0.10 during November in the control group but 1.27 ~ 0.05 during October in treated group. GSI of female was about 1.82 from January to November 1996 and reached the maximum of 46.5 ~ 5.72 during April 1997 in the control group but 42.0~4.24 during february 1997 in the treated group. The pattern of ovary and testis development did not much differ between the treated and control groups. However, the copulation and parturition of black rockfish could be advance 2~3 months by controlling photoperiod and temperature.

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Effects of Sex Steroid Hormones and High Temperature on Sex Differentiation in Black Rockfish, Sebastes schlegeli (성스테로이드 호르몬과 고수온 처리가 조피볼락, Sebastes schlegeli의 성분화에 미치는 영향)

  • LEE Chi Hoon;NA Oh Soo;YEO In Kn;BAEK Hea Ja;LEE Young Don
    • Korean Journal of Fisheries and Aquatic Sciences
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    • v.33 no.5
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    • pp.373-377
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    • 2000
  • This study Investigated the effects of $estradiol-l7{\beta} (E_2)$, $17{\alpha}-methyltestosterone$ (MT) and high temperature (WT) on gonadal sex differentiation in black rockfish, Sebastes srhlegeli. fish were reared to oral adminstration of E, at nominal concentrations of $20, 40 and 60 {\mu}g/g diet$, and MT at nominal concentration of 20 and $50 {\mu}g/g$ diet from 56 days to 77 days after parturition. In the treatment of WT, water temperature of the breeding tanks ranged $27.0{\pm}0.5^{\circ}C$ more than $10^{\circ}C$ approximately, in comparison to the control and other experimental group, In the process of sex differentiation until 56 days after parturition, gonads were composed of mostly gonia cells, sexually undifferentiated. In contrast, 128 dal's after parturition, the ovaries were composed of ovarian cavity and lamellae, and oogonia and perinucleolus oocytes were distributed in the lamellae of ovary, and the testes were composed of a number of seminiferous tubule, and spermatogonia were distributed in the seminiferous tubule, and also melanophore scattered in the matrix layer of testis. In the sex ratio, more females than male were observed from $E_2$. treatment groups when compared to the control, but more males than females were observed from MT and WT treatment groups when compared to the control. In the results of the present study, the concentration and kinds of the sex steroid hormones, and also the rearing high temperature caused to the factor of sex determination in the process of sex differentiation of black rockfish.

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Effects of temperature on pharmacokinetics of oxolinic acid in black rockfish, Sebastes schlegeli following oral administration (조피볼락, Sebastes schlegeli에 경구투여된 oxolinic acid의 약물동태에 미치는 수온의 영향)

  • Jung, Sung-Hee;Kim, Jin-Woo;Seo, Jung-Soo;Jee, Bo-Young;Park, Myoung-Ae
    • Journal of fish pathology
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    • v.23 no.2
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    • pp.221-227
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    • 2010
  • Effects of temperature ($13{\pm}1.5^{\circ}C$, $23{\pm}1.5^{\circ}C$) on the pharmacokinetic properties of oxolinic acid (OA) were studied after oral administration to cultured black rockfish, Sebastes schlegeli. Serum concentrations of OA were determined using HPLC-UV detector after a single dosage of 60 mg/kg body weight (average about 500 g). The peak serum concentrations of OA at $23{\pm}1.5^{\circ}C$ and $13{\pm}1.5^{\circ}C$ were $0.60{\mu}/ml$ at 30 h and $2.22{\mu}g/ml$ at 10 h post-dose, respectively. Better absorption of OA was noted at $13{\pm}1.5^{\circ}C$ compared to $23{\pm}1.5^{\circ}C$. The elimination of OA from serum was considerably faster at $23{\pm}1.5^{\circ}C$ than at $13{\pm}1.5^{\circ}C$. Both absorption and elimination of OA were affected significantly by temperature. The kinetic profile of absorption, distribution and elimination of OA in serum was analyzed by fitting to a two compartment model, with WinNonlin program. The AUC, Tmax and Cmax at $23{\pm}1.5^{\circ}C$ were $42.16{\mu}g{\cdot}h/m\ell$, 26.13 h and $0.43{\mu}g/ml$, respectively. The AUC, Tmax and Cmax at $13{\pm}1.5^{\circ}C$ were $131.98{\mu}g{\cdot}h/ml$, 8.81 h and $2.04{\mu}g/ml$, respectively.

First Record of the Monogenean Parasite of Menziesia sebastodis (Capsalidae) in Korea

  • Kim, Jeong-Ho
    • Animal Systematics, Evolution and Diversity
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    • v.25 no.1
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    • pp.129-132
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    • 2009
  • Menziesia sebastodis (Capsalidae: Monogenea) is found and described from the gill filaments and the gill rakers of the black rockfish, Sebastes inermis, caught at Dolsan Island, off the south coast of Yeosu, Jeollanam-do, Korea. The genus Menziesia is distinguished from other related genera Benedenia, Megalobenedenia and Trochopus, by septate haptors and the morphology of copulatory organs. M. sebastodis can be differentiated from other Menziesia species by the longer and slenderer posterior anchor, and the location of accessory gland reservoir. This is the first record of the genus Menziesia in Korea.

Trematodes in Marine Fishes from the Western Coastal Water of Korea (한국 연안산 어류에 기생하는 흡충류 4종)

  • Kim, Young-Gill;Lee, Dae-Suab;Park, Sung-Woo
    • Journal of fish pathology
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    • v.14 no.1
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    • pp.21-30
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    • 2001
  • From March 1998 to April 2000, 4 species of marine fishes including black rockfish (Sebastes schlegeli), goby (Acanthogobius flavimannus), fine-spooted flounder (Pleuronichthys cornutus), and croaker (Nibea albiflora) were captured from the coastal area of the Gogunsan island located in the mouth of the Kum River, and greenling (Hexagrammos otakii) was sampled from the coastal areas of the Gogunsan island and the Wan-do. Trematodes from the stomach and the intestine of the fishes were detected and identified on the basis of the morphological characteristics. Four species of trematodes were detected in the stomach and the intestine of the examined fishes ; Opecoelus lobatus Ozaki, 1925 from black rockfish, fine-spotted flounder and greenling, Coitoecum glandulosum Yamaguti, 1934 from goby, Phyllodistomum sp. Braun, 1899 from croaker, and Pharyngora sp. Lebour, 1908 from greenling captured from Wan-do. This report gave morphological descriptions of O. lobatus, Pharyngora sp. and Phyllodistomum sp. from coastal marine fishes in Korea.

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Age and growth of the black rockfish, Sebastes inermis, in the Jeonnam marine ranching area in the southern Sea of Korea (한국 남해 전남바다목장해역 볼락, Sebastes inermis의 연령과 성장)

  • Kim, Hee-Yong;Kim, Sang-Hwa;Huh, Sun-Jung;Seo, Young-Il;Lee, Sun-Gil;Ko, Jun-Chul;Cha, Hyung-Kee;Choi, Mun-Sung
    • Journal of the Korean Society of Fisheries and Ocean Technology
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    • v.46 no.4
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    • pp.346-357
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    • 2010
  • Characteristics of age and growth of the black rockfish, Sebastes inermis sampled in the Jeonnam Marine Ranching Area (JMRA) around Geumo Islands south of Yeosu were investigated using 642 otoliths from March 2009 to February 2010. The opaque zone was formed in September once a year and hence it was used as an annulus. The parturient period was December to January, and therefore the duration from fertilization to the complete formation of the opaque zone was nineteen months. From the parameters calculated using the average length when the year ring was formed, growth of S. inermis were expressed by von Bertalanffy growth equation as $L_t$=23.267 ($1-e^{-0.4406(t+1.1971)}$) for females and $L_t$=22.030 ($1-e^{-0.5312(t+0.6834)}$) for males when is total length in age t. Through the growth equations, the maximum length was determined as 23.27cm for females and 22.03cm for males and the growth factor as 0.4406/yr and 0.5312/yr, respectively. Finally, the growth of female S. inermis is larger than the one of male S. inermis.

Feeding Ecology of Black Rockfish, Sebastes inermis (볼락, Sebastes inermis 의 섭식상태)

  • KIM Chong-Kwan;KANG Yong-Joo
    • Korean Journal of Fisheries and Aquatic Sciences
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    • v.32 no.5
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    • pp.637-641
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    • 1999
  • This study was carried out to understand feeding ecology of black rockfish, Sebastes inermis in the coastal waters off Shinsudo, Sachon. The specimens were collected by angling, gill net, small danish seine, and long-bag net from February 1984 to May 1985. The fish consisted of 5 age groups from 0 to 4. Feeding activity was more intensive in the early morning and late afternoon in spring and summer, but the fish showed intermittent feeding activities in autumn and winter. Although the food items of the fish changed slightly by seasons and with growth of the fish, main food items were cope pods, gammarids, caprellids, carideans, polychaetes, and brachyurans. Of these food items, cope pods were major preys for the fish of age group 0, and gammarids over age group 1. Evenness and diversity of the food items increased as the fish grew. In consideration of feeding organs, digestive organs and stomach contents of the fish, S. inermis seemed to be not only carnivore but also visual feeder consuming mainly small crustaceans.

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Effects of the Different Anesthetic Doses of MS-222 and Lidocaine-HCl on the Blood Physiological Responses in Black Rockfish, Sebastes schlegeli (MS-222와 lidocaine-HCl의 농도별 마취에 대한 조피볼락(Sebastes schlegeli)의 혈액생리학적 반응)

  • Kim Jae Ho;Hur Jun Wook;Park In-Seok;Kho Kang Hee;Chang Young Jin
    • Journal of Aquaculture
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    • v.18 no.4
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    • pp.236-244
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    • 2005
  • Experiments were performed to investigate the effects of the different anesthetic MS-222 and lidocaine-HCl doses on the blood physiological responses, on the time required for anesthesia and recovery, and on the survival rates of black rockfish (Sebastes schlegeli). Plasma cortisol was its highest levels (96.1$\pm$12.1 ng/ml) at 6 hours after the administration of 300 ppm of MS-222, and in all groups, plasma cortisol levels were higher than the initial levels during the anesthetic experiment. Fish receiving lidocaine-HCl also exhibited higher than initial plasma cortisol levels at almost experimental intervals. The middle size fish exhibited the highest glucose level (143.3$\pm$14.5 mg/dl) at 50 ppm of anesthesia after 1 hour, and every level was significantly higher than the initial level for at least 12 hours. Glucose levels in fish to which lidocaine-HCl was administered were comparable to the levels seen in conjunction with MS-222 treatment. In fish anesthetized with MS-222, K+ levels in the small size fish were significantly elevated after 1 hour, while Na+ levels did not change in any of the groups throughout the experiment. Anesthetic time was significantly attenuated with increases in the concentrations of MS-222 and lidocaine-HCl. We also noted a correlation between anesthetic time and fish size, in that larger fish took a longer time, followed by the middle size and then the small size fish. The all fish size groups showed above $95\%$ survival rates at every experimental concentration in MS-222 and 300-400 ppm in lidocaine-HCl. The results may indicate that 100-200 ppm MS-222 and 400 ppm lidocaine-HCl are the most effective doses as sedatives for the black rockfish and these doses could be used as the suitable anesthetics doses.

Effect of temperature on pharmacokinetics of nalidixic acid and piromidic acid in black rockfish Sebastes schlegeli following oral administration (조피볼락, Sebastes schlegeli에 경구투여된 nalidixic acid 및 piromidic acid의 약물동태에 미치는 수온의 영향)

  • Jung, Sung-Hee;Seo, Jung-Soo;Jee, Bo-Young;Kim, Jin-Woo;Park, Myoung-Ae
    • Journal of fish pathology
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    • v.24 no.1
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    • pp.29-37
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    • 2011
  • Effects of temperature ($13{\pm}1.5^{\circ}C$, $23{\pm}1.5^{\circ}C$) on the pharmacokinetic properties of nalidixic acid (NA) and piromidic acid (PA) were studied after oral administration to cultured black rockfish, Sebastes schlegeli. Serum concentrations of NA and PA were determined using HPLC-UV detector after a single dosage of 60 mg/kg body weight. At $23{\pm}1.5^{\circ}C$, the peak serum concentrations of NA and PA, which attained at 24 h post-dose, were 5.87 and $0.43\;{\mu}g/ml$, respectively. At $13{\pm}1.5^{\circ}C$, the peak serum concentrations of NA and PA, which attained at 10 h post-dose, were 6.22 and $1.57\;{\mu}g/ml$, respectively. Better absorption of PA was noted at $13{\pm}1.5^{\circ}C$ compared to $23{\pm}1.5^{\circ}C$. However, absorption of NA was not affected significantly by temperature. The elimination of NA and PA from serum of black rockfish was considerably faster at $23{\pm}1.5^{\circ}C$ than at $13{\pm}1.5^{\circ}C$. The kinetic profile of absorption, distribution and elimination of NA and PA in serum were analyzed by fitting to a one compartment model, with WinNonlin program. The AUC, $T_{1/2}$, $T_{max}$ and $C_{max}$, respectively, were: $161.25\;{\mu}g{\cdot}h/ml$, 0.15 h, 12.29 h and $8.91\;{\mu}g/ml$ at $23{\pm}1.5^{\circ}C$, and $134.12{\mu}g{\cdot}h/ml$, 0.18 h, 8.79 h and $5.00\;{\mu}g/ml$ at $13{\pm}1.5^{\circ}C$ with NA; $41.57\;{\mu}g{\cdot}h/ml$, 0.58 h, 8.24 h and $0.21\;{\mu}g/ml$ at $23{\pm}1.5^{\circ}C$, and $40.36\;{\mu}g{\cdot}h/ml$, 0.59 h, 5.04 h and $1.20\;{\mu}g/ml$ at $13{\pm}1.5^{\circ}C$ with PA.