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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Fisheries and aquatic sciences
Journal Basic Information
Journal DOI :
The Korean Society of Fisheries and Aquatic Science
Editor in Chief :
Sungchul C. Bai
Volume & Issues
Volume 10, Issue 4 - Dec 2007
Volume 10, Issue 3 - Sep 2007
Volume 10, Issue 2 - Jun 2007
Volume 10, Issue 1 - Mar 2007
Selecting the target year
Proximate and Total Fatty Acid Compositions of the Reproductive Organs of Male and Female Common Squid Todarodes pacificus
Moon, Soo-Kyung ; Kim, Kyeong-Dae ; Kang, Ji-Yeon ; Sung, Nak-Ju ; Jeong, Bo-Young ;
Fisheries and aquatic sciences, volume 10, issue 4, 2007, Pages 171~178
DOI : 10.5657/fas.2007.10.4.171
We analyzed the compositions of proximate and total fatty acids in the reproductive organs of male (testis, vas deferens, seminal vesicle, and spermatophore sac) and female (ovary, oviduct, oviducal gland, and nidamental gland) common squid. The protein contents were 12.1-22.7 and 13.2-19.4% for males and females, respectively, and the lipid contents were 1.0-2.7 and 2.1-8.0%, respectively. The prominent fatty acids in all reproductive organs were 22:6n-3, 20:5n-3, 16:0, 20:1n-9, 18:0, 18:1n-9, and 20:4n-6. Females had 28.6-32.0% of 22:6n-3 and 11.3-22.6% of 20:5n-3, while males had 20.8-26.8% of 22:6n-3 and 14.4-28.7% of 20:5n-3. These results indicate that the reproductive organs of both male and female squid are potential sources of n-3 polyunsaturated fatty acid.
PCR of Gut Contents for a Food Web Study of a Marine Ecosystem
Kim, Nack-Keun ; Kim, Kyoung-Sun ; Kim, Hyun-Woo ;
Fisheries and aquatic sciences, volume 10, issue 4, 2007, Pages 179~185
DOI : 10.5657/fas.2007.10.4.179
Understanding dietary habits is one of the most important factors in studying food webs and other ecological processes. Here we designed universal primers to amplify portions of the 18S and 28S rDNA sequences to examine gut contents using PCR techniques. The gut contents of sailfin sandfish (Arctoscopus japonicus) and pacific squid (Todarodes pacificus) were examined. In total, 11 families of prey were identified with 18S and 28S rDNA using the universal primers. The DNA sequence data indicated that the primer sets successfully amplified a wide spectrum of species and represented gut contents in a relatively convenient way. We found that information in the NCBI database was not yet sufficient to discriminate the species we isolated. In addition, technology for the separation of heterogeneous PCR products and better resolution and quantification protocols would help increase data accuracy.
Genetic Analysis of Asian Chum Salmon Populations Based on Microsatellite DNA Variation
Yoon, Moon-Geun ; Abe, Syuiti ; Jin, Deuk-Hee ;
Fisheries and aquatic sciences, volume 10, issue 4, 2007, Pages 186~190
DOI : 10.5657/fas.2007.10.4.186
We examined the genetic variability of Asian chum salmon (Oncorhynchus keta) populations using nuclear microsatellite (ms) DNA analysis with four polymorphic loci (OKM4, OKM5, OKM7, and OKM8) in 397 individuals from nine populations, including one in Korea, seven in Japan, and one in Russia. The msDNA gene diversity was highest in the Japanese populations, suggesting greater genetic variation in the populations in Japan than in populations in Korea and Russia. The pairwise
estimates based on our msDNA data showed that the Korean population was genetically different from the Japanese and Russian populations, and there were higher
estimates between Hokkaido and Honshu populations than between other population pairs. A neighbor-joining tree showed that the Korean population was distinct from two other clusters, representing the populations in Honshu and the populations in Hokkaido and Russia. These results suggest that the observed population genetic patterns of Asian chum salmon might be influenced by low or restricted gene flow.
Growth and Sex Ratio of Juvenile Olive Flounder (Paralichthys olivaceus) at Different Size-ranks
Kim, Jong-Hyun ; Kim, Hyun-Chul ; Noh, Jae-Koo ; Lee, Jeong-Ho ; Kang, Jung-Ha ; Kim, Kyung-Kil ;
Fisheries and aquatic sciences, volume 10, issue 4, 2007, Pages 191~195
DOI : 10.5657/fas.2007.10.4.191
The aim of this study was to assess whether size-rank at the juvenile stage is associated with growth performance and sex ratio in olive flounder (Paralichthys olivaceus). Juveniles (mean body weight,
) were selected from two age groups, with the high size-rank group (HSRG) fish in the upper 19.3-67.3% of 104 days post-hatching (dph) age group and the low size-rank group (LSRG) fish in the lower 9.0-55.7% of 116 dph age group. Triplicate groups of 100 fish were reared over 32 weeks. A heavier final body weight was observed in the HSRG (
) compared to the LSRG (
, P<0.05), whereas no differences in feed intake, feeding efficiency, and mortality were seen between the experimental groups. The percentage of females was significantly higher in the HSRG (51.7%) than in the LSRG (30.8%, P<0.05). In addition, a remarkable increase in growth was recorded in females, indicating that the relative frequency of females increased with a body weight increase. The results suggest that high size-rank juvenile olive flounder have better growth performance and a higher percentage of females, because females start growing faster than males before size grading occurs.
Ultrastructure of Spermatozoa of the Light Bullhead Leiocassis nitidus (Teleostei, Siluriformes, Bagridae)
Kim, Kgu-Hwan ; Kwon, Ae-Sook ; Lee, Byung-Chan ;
Fisheries and aquatic sciences, volume 10, issue 4, 2007, Pages 196~199
DOI : 10.5657/fas.2007.10.4.196
The spermatozoa of Leiocassis nitidus are relatively simple cells composed of a spherical head, a short midpiece, and a tail, as in most Siluriformes. The ultrastructure is characterized by the following features: Acrosome absent, as in most teleosts; around nucleus about
long, with a deep nuclear fossa containing the proximal and distal centrioles and mitochondria. Two centrioles approximately
from each other; 10 or more mitochondria surrounding the axoneme (with a 9+2 microtubular pattern), arranged in two layers in the postnuclear cytoplasm and separated from the axoneme by the cytoplasmic canal. Two lateral fins on the same plane as the two central microtubules; doublets 3 and 8, which are ultrastructural characteristics of the sperma tail unlike other siluroids laking the lateral fins.
Two Penaeoid Shrimp (Crustacea: Decapoda) New to Korean Waters
Kim, Jung-Nyun ; Choi, Jung-Hwa ; Choi, Kwang-Ho ; Kim, Sung-Tae ; Choi, Young-Min ;
Fisheries and aquatic sciences, volume 10, issue 4, 2007, Pages 200~204
DOI : 10.5657/fas.2007.10.4.200
We describe two penaeoid shrimp, Hymenopenaeus equalis and Metapenaeus ensis, that were collected from an area northwest of Jeju Island and are new to Korean waters. Hymenopenaeus equalis is the first Korean representative of this genus. A brief distributional and morphological description of the two species is provided.
Sources and Distributions of Organic Wastewater Compounds on the Mokpo Coast of Korea
Choi, Min-Kyu ; Choi, Hee-Gu ; Moon, Hyo-Bang ; Yu, Jun ; Kang, Sung-Kyung ; Choi, Su-Kyung ;
Fisheries and aquatic sciences, volume 10, issue 4, 2007, Pages 205~214
DOI : 10.5657/fas.2007.10.4.205
Surface water and sediment samples collected from the Mokpo coast of Korea were analyzed for molecular markers of organic municipal wastewaters, i.e., 11 fecal sterols including coprostanol (Cop) and nonylphenolic compounds (NPs), to characterize the main routes of these wastewaters to the coast and to assess contamination levels. Concentrations of Cop ranged from 94 to 7,568 ng/L in surface water and from 43 to 38,108 ng/g dry weight in sediments. Concentrations of NPs [nonylphenol (NP) and nonylphenol mono- and di-ethoxylates (
)] ranged from 123 to 4,729 ng/L in surface water and from 4 to 2,119 ng/ng dry weight in sediments. The levels of these compounds were much higher at stations near the rivers that pass through the urban center of Mokpo and the outfall of the wastewater treatment plant (WWTP). The spatial distribution of Cop levels was statistically similar to that of NPs (r=0.809 and 0.982 in surface water and sediments, respectively), indicating that these compounds may have similar discharge points, transport, mixing, and deposition in the study area. These results suggest that considerable amounts of organic wastewater compounds are discharged through rivers and WWTP effluent to the Mokpo coast.
Effects of Environmental Changes on Stock of Krill and Salp in the Atlantic and Indian Sectors of the Antarctic
Lee, Chung-Il ; Pakhomov, E.A. ; Atkinson, Angus ; Siegel, Volker ;
Fisheries and aquatic sciences, volume 10, issue 4, 2007, Pages 215~219
DOI : 10.5657/fas.2007.10.4.215
Long-tenn variation in krill (Euphausia superba) and salp (mainly Salpa thompsoni) stocks was compared to environmental changes in the Atlantic and Indian sectors of the Antarctic. Environmental conditions examined were air temperature, water temperature, salinity, and sea-ice extent from 1926 to 1938 and from 1982 to 2000. The long-term pattern of krill was opposite to that of salp: krill stock decreased while salp stock increased concurrently. Krill stock was about three-fold higher from 1926 to 1938 than from 1982 to 2000, but salp was about four -fold lower in 1926-1938 than in 1982-2000. A wanning trend was observed in the environmental data, and the long-term variation in krill and salp stocks was affected by this trend.
Complex Movements of Skipjack Schools Based on Sonar Observations during Pelagic Purse Seining
Kim, Yong-Hae ;
Fisheries and aquatic sciences, volume 10, issue 4, 2007, Pages 220~225
DOI : 10.5657/fas.2007.10.4.220
The movements of skipjack schools during purse seine operations were observed by scanning sonar in the Southwest Pacific Ocean in April 2004. Swimming speed and directional changes were analyzed in relation to heading of the purse seine during shooting, speed of the purse seiner and distance to the net. Escaped schools turned clockwise (relative to the heading of the purse seiner during shooting) significantly more frequently than captured schools, who primarily turned counter-clockwise. The swimming speed of a fish school, whether it was caught or escaped, was somewhat related to the ship's speed, but swimming speed did not differ between captured and escaped schools. The behavior of skipjack schools during purse seining consists of very complex movements with changes in swimming speed and direction in relation to the nets or purse seiner. Therefore, these responses of skipjack schools to purse seining can be useful for modeling the capture process of purse seining in relation to fishing conditions.
Evaluation of a Visible Implant Fluorescent Elastomer Tag in the Soft-shelled Turtle, Pelodiscus sinensis
Park, Min-Ouk ; Seol, Dong-Won ; Im, Soo-Yeon ; Hur, Woo-June ; Park, In-Seok ;
Fisheries and aquatic sciences, volume 10, issue 4, 2007, Pages 226~229
DOI : 10.5657/fas.2007.10.4.226
Survival, tag retention and tag readability were compared among the control and three treatment groups of soft-shelled turtles, Pelodiscus sinensis Crother, 2000 (mean body
), marked with visible implant fluorescent elastomer (VIFE) tags for 16 months. Mortality 4 to 16 months after tagging was attributed to collection and handling stress rather than to the tagging itself. Tags applied to the web surface between the fourth and fifth dactyl of the hindfoot appeared to have the highest retention rates, while adipose eyelid tagging had high tag readability but a high loss rate. We conclude that in soft-shelled turtles, the most suitable region for VIFE tagging is on the web surface between the fourth and fifth dactyls of the hindfoot.