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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Korean Journal of Fisheries and Aquatic Sciences
Journal Basic Information
Journal DOI :
The Korean Society of Fisheries and Aquatic Science
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Volume & Issues
Volume 39, Issue 6 - Dec 2006
Volume 39, Issue 5 - Oct 2006
Volume 39, Issue 4 - Aug 2006
Volume 39, Issue 3 - Jun 2006
Volume 39, Issue spc1 - May 2006
Volume 39, Issue 2 - Apr 2006
Volume 39, Issue 1 - Feb 2006
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Effects of Hydrolysis pH on Distribution of Molecular Weights of Alginates of Sea Tangle Laminaria japonica
Lim, Yeong-Seon ; You, Byeong-Jin ;
Korean Journal of Fisheries and Aquatic Sciences, volume 39, issue 4, 2006, Pages 313~317
DOI : 10.5657/kfas.2006.39.4.313
To prepare oligouronic acids from high-molecular-weight alginates, sea tangle (Laminaria japonica) alginates were hydrolyzed at various pHs for 1 hr at 80
. The effects of hydrolysis pH (HpH) on the average molecular weight (AMW) and MW distribution ratios (DRs) in the hydrolyzed alginates were investigated. As HpH decreased, the DRs of the alginates with MW>500 kDa and MW=300-500 kDa decreased exponentially, while it increased exponentially for MW<50 kDa. For MW=100-300 kDa, DR increased exponentially as HpH fell from 5.0 to 3.5, and then decreased exponentially. Similarly, for MW=50-100 kDa, DR increased exponentially as HpH increased to 1.0 from 5.0, and then decreased exponentially. As HpH decreased, the MW cutoff size and AMW of alginates fraction with the highest DR were decreased. For HpH 4.5 and 5.0, the MW cutoff size with the highest DRs was MW=300-500 kDa; the DRs were 28.9 and 32.6%, respectively; and the AMW of both was about 400 kDa, for HpH 3.5 and 4.0, the cutoff size was MW=100-300 kDa; the DRs were about 28%: and the AMWs were both about 200 kDa. For HpH 3.0, the cutoff size was MW=50-100; the DR was 29.0%; and the AMW was 73 kDa. For HpH values below 2.0, the MW cutoff size with the highest DRs was MW<50 kDa, and all of the AMWs were below 28 kDa.
Anticancer Activity of Ultrasonified Extracts from Seawater-based Culture of the Microalga Spirulina platensis
Kim, Hyou-Sung ; Kim, Cheol-Hee ; Kwon, Min-Chul ; Song, Young-Kyu ; Cho, Jung-Hwan ; Gwak, Hyeong-Geun ; Hwang, Bo-Young ; Kim, Jin-Chul ; Lee, Hyeon-Yong ;
Korean Journal of Fisheries and Aquatic Sciences, volume 39, issue 4, 2006, Pages 318~325
DOI : 10.5657/kfas.2006.39.4.318
Ultrasonified extracts from seawater-based cultures of the microalga Spiyulina platensis were obtained using water and ethanol at 60 and 100
. The yield of the aqueous fraction of S. platensis extracted using ultrasonification was about 33.46%. The cytotoxicity against HEK293 and inhibition ratios of the cancer cell lines A549, AGS, MCF7, and Hep3B were measured using the sulforhodamine-B (SRB) assay. The cytotoxicity of all extracts at 1.0 mg/mL was below 26%. The cytotoxicity of the ultrasonified extracts from the seawater-based culture of the microalga Spirulina platensis was about 4% less than that of Spirulina platensis without ultrasonification. The inhibition ratio of cancer cell growth was approximately 80% for 1.0 mg/mL extracts. The inhibitory effect on cancer cell growth was greater for seawater containing ultrasonified Spirulina platensis extracts than for extracts without ultrasonification. The differentiation ratio of HL-60 cells was 160.9%. Densitometric analysis of Bcl-2 revealed that the ultrasonified extracts had greater anticancer activity than the extracts without ultrasonification.
Gene Expression Levels of Growth Hormone, Prolactin and Their Receptors of Olive Flounder Paralichthys olivaceus by Salinity Changes
Cho, Young-Min ; Shin, Ji-Hye ; Sohn, Young-Chang ;
Korean Journal of Fisheries and Aquatic Sciences, volume 39, issue 4, 2006, Pages 326~332
DOI : 10.5657/kfas.2006.39.4.326
To investigate the effects of environmental salinity on the expression of the genes for growth hormone (GH) and prolactin (PRL) in the pituitary, and their receptors (GHR, PRLR) In the kidney, intestine, and gills in teleosts, we acclimated juvenile olive flounders (Paralichthys olivaceus) to different salinities (5, 15, 25, or 32 psu) for 3 days and examined their mRNA levels using the reverse transcription-polymerase chain reaction (RT-PCR). In the fish adapted to low salinity, the PRL mRNA levels in the pituitary were elevated dramatically, whereas the GH mRNA levels did not differ significantly. PRLR mRNA increased significantly in fish exposed to low salinity, whereas GHR mRNA levels did not differ. These results suggest that PRL is an important hormone for flounders that are acclimated to brackish water and it may control ion homeostasis with PRLR in the osmoregulatory organs.
Screening Anti-inflammatory Actinomycetes Isolated from Seaweeds and Marine Sediments
Park, Nam-Hee ; Hong, Yong-Ki ; Cho, Ji-Young ;
Korean Journal of Fisheries and Aquatic Sciences, volume 39, issue 4, 2006, Pages 333~337
DOI : 10.5657/kfas.2006.39.4.333
The anti-inflammatory activities of marine actinomycetes were surveyed. In total, 363 strains were isolated from marine sediments, seaweed tissue, and seaweed rhizosphere. Of these, strains 16 and 291-11 showed the most potent anti-inflammatory activity in phorbol-ester-induced mouse ear edema and erythema assays. Strains 16 and 291-11 were isolated from the rhizosphere of the brown seaweeds Sargassum thunbergli and Undaria pinnatifida, respectively, and were identified as Streptomyces macrosporeus and St. praecox, respectively, using 165 rDNA sequence analysis.
Histological Structure of the Barbels of Liobagrus andersoni and L. obesus (Amblycipitidae: Pices) from Korea
Park, In-Seok ; Seol, Dong-Won ; Im, Soo-Yeon ; Kim, Chi-Hong ; Kang, Eon-Jon ; Gong, Yong-Gun ;
Korean Journal of Fisheries and Aquatic Sciences, volume 39, issue 4, 2006, Pages 338~343
DOI : 10.5657/kfas.2006.39.4.338
Histological observations of the barbels of torrent catfish (Amblycipitidae) in Korea are reported. The bullhead torrent catfish (Liobagrus andersoni) and Korean torrent catfish (L. obesus) have eight obvious barbels in two pairs each on the maxilla and mandible. Each barbel is composed of an epidermis, dermis, and central cartilagerod. The epidermis of the maxillary and mandibular barbels of the bullhead torrent catfish is thicker than that of the Korean torrent catfish (P<0.05) and is formed of stratified epithelium that contains many cutaneous taste buds and a few small club cells. There are many taste buds on the upper part of each barbel. The dermis consists of loose connective tissue fibers that enclose blood vessels and bundles of nerve fibers. The barbels of these fish can be categorized into stiff and flexible types and are accessory, feeding, and sensory structures. Our results validate the barbels as gustatory receptor organs for these fishes.
Population Parameters and Biomass of the Shiba Shrimp Metapenaeus joyneri in Korean Waters
Choi, Jung-Hwa ; Chang, Dae-Soo ; Kim, Jung-Nyun ;
Korean Journal of Fisheries and Aquatic Sciences, volume 39, issue 4, 2006, Pages 344~348
DOI : 10.5657/kfas.2006.39.4.344
The ecological characteristics and stock biomass of the Shiba shrimp, Metapenaeus joyneri, in Korean waters were determined, using fishery data from the Ministry of Maritime Affairs and Fisheries (MOMAF) and available length frequency data. The instantaneous coefficient of total mortality (Z) of M. joyneri was estimated to be 4.191year, and the annual survival rate (S) was 0.015. The estimated instantaneous coefficient of fishing mortality (F) for recent years was calculated to be 1.94/year. The age at first capture of M. joyneri was 0.71 years. Based on these parameters, the annual biomass of the M. joyneri stock was estimated using a biomass-based cohort analysis and data on the annual catch in weight at age for 1993-2004 in Korean waters. During the study period, the biomass of the shrimp peaked in 1994 at about 9,082 metric tons. Subsequently, it decreased to 500 metric tons in 1998.
Sexual Maturation and Spawning in the Sandfish Arctoscopus japonicus in the East Sea of Korea
Lee, Hae-Won ; Kim, Jin-Hee ; Kang, Yong-Joo ;
Korean Journal of Fisheries and Aquatic Sciences, volume 39, issue 4, 2006, Pages 349~356
DOI : 10.5657/kfas.2006.39.4.349
Gonad development in the sandfish Arctoscopus japonicus was investigated using a histological method. Specimens were collected monthly from April 2003 to March 2004, in the East Sea of Korea. The gonadosomatic index (GSI) of females began to increase in August, reached a maximum in November, and declined sharply in December. By contrast, in males, the GSI began to increase in June and reached a maximum in August. The annual reproductive cycle of A. japonicus can be divided into four successive stages in females: the early growing (January-March), late growing (April-August), ripe and spent (September-November), and recovery (December) stages. Males passed through early growing (January-April), late growing (May-July), ripe and spent (August-November), and recovery (November-December) stages. These results indicate that the spawning season was from October to December. The egg diameter of mature oocytes was 3.12
0.02 mm. The relationship between fecundity (F
) and body length (BL) was F
. Fecundity ranged from 483-2,254 eggs in a body length of 14.3-22.9 cm and increased with body length. The body length at 50% maturity was 14.80 cm, which corresponded to an age of 2.40 years.
Feeding Habits of John Dory Zeus faber in the Coastal Waters off Gori, Korea
Huh, Sung-Hoi ; Park, Joo-Myun ; Baeck, Gun-Wook ;
Korean Journal of Fisheries and Aquatic Sciences, volume 39, issue 4, 2006, Pages 357~362
DOI : 10.5657/kfas.2006.39.4.357
The feeding habits of John Dory (Zeus faber) were studied by examining the stomach contents of 317 specimens collected from January 2004 to December 2005 in the coastal waters off Gori, Korea. The standard length (SL) of the specimens ranged from 12 to 42 cm. Z. faber is a piscivore and consumes mainly teleost fish such as Psenopsis anomala, Trichiurus lepturus and Conger myriaster. Its diet also includes shrimp and cephalopods. Smaller individuals (<25 cm SL) consume shrimp and small fish such as Glossanodon semifasciatus. The proportion of these prey items decreases with increasing fish size, and this decrease is paralleled by increased consumption of lager fish such as Psenopsis anomala and Trichiurus lepturus. The prey size increases with Z. faber size.