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사료 첨가제로서 한약제가 은어의 성장 및 체성분에 미치는 영향
이상민,임태준 강릉대학교 동해안지역연구소 2000 東海岸硏究 Vol.11 No.2
This study was conducted to investigate the effects of herb as an additive in formulated diet on growth and body composition of larval ayu (Plecoglossus altivelis). Three replicate groups of ayu initially average weighing 100 mg were fed the each one of experimental miso-diet containing 0% or 1% herb for 7 weeks. Dietary herb had no significantly (P〉0.05) distinctive effect on survival and weight gain. Moisture, crude protein, crude ash and amino acids contents of ayu were not influenced by dietary herb (P〉0.05), whereas lipid content of aye fed the diet containing herb was significantly lower than that of control diet (P〈0.01). The results indicate that herb as an additive in micro-formulated diet can improve body quality of larval ayu.
Directional Asymmetry of Gonadal Development in Ayu (Plecoglossus altivelis)
박인석,방인철,장창익,김영자 한국수산과학회 2005 Fisheries and Aquatic Sciences Vol.8 No.4
Directional (sinistral) asymmetry (DA) occurs when the traits of one side of a supposedly bilaterally symmetrical organism differ in a random way from those of the other side. We examined asymmetries in gonadal growth traits within both sexes of hatchery reared ayu, Plecoglossus altivelis. The pattern of the gonadal growth from hatching to 320 days after hatching was a type of DA except for the growth in gonad weight from 140 to 180 days after hatching, although the ovary of the right side tended to exhibit more pronounced DA phenomenon.
Directional Asymmetry of Gonadal Development in Ayu (Plecoglossus altivelis)
Park In-Seok,Zhang Chang Ik,Kim Young Ja,Bang In Chul The Korean Society of Fisheries and Aquatic Scienc 2005 Fisheries and Aquatic Sciences Vol.8 No.4
Directional (sinistral) asymmetry (DA) occurs when the traits of one side of a supposedly bilaterally symmetrical organism differ in a random way from those of the other side. We examined asymmetries in gonadal growth traits within both sexes of hatchery reared ayu, Plecoglossus altivelis. The pattern of the gonadal growth from hatching to 320 days after hatching was a type of DA except for the growth in gonad weight from 140 to 180 days after hatching, although the ovary of the right side tended to exhibit more pronounced DA phenomenon.
( Hyon Sob Han ),( Nobuhiko Taniguchi ),( Jong Ha Lee ),( Moon Geun Yoon ) 한국수산과학회(구 한국수산학회) 2011 Fisheries and Aquatic Sciences Vol.14 No.4
We investigated the genetic structure of Korean and Japanese ayu Plecoglossus altivelis populations by examining 669 individuals from 14 populations using three microsatellite loci. Genetic variation did not differ significantly among the populations examined in terms of allelic number and heterozygosity. Korean populations were genetically close to each other, implying that persistent gene flow has occurred in these populations. This suggests that eastern populations in Korea form a single large population and all of the Korean populations are distinct from the Japanese populations. Pairwise population FST estimates, principal component analyses, and a neighbor-joining tree showed that genetic separation between the southern and pooled eastern coast populations was probably influenced by restricted gene flow. Hierarchical analysis of molecular variance (AMOVA) revealed a weak but significant genetic structure among three ayu groups (eastern and southern coasts of Korea and the Japan coast), and no genetic variation within groups. The estimated genetic population structure and potential applications of microsatellite markers may aid in the proper management of ayu populations.
Kim, J.H.,Gomez, D.K.,Nakai, T.,Park, S.C. Elsevier Scientific Pub. Co 2010 Veterinary microbiology Vol.140 No.1
In order to investigate methods for controlling systemic bacterial coldwater disease (CWD), bacteriophages that infect Flavobacterium psychrophilum were isolated by the enrichment method from pond water collected from Japanese ayu farms. The five phages isolated were classified as members of Myoviridae (PFpW-3, PFpC-Y), Podoviridae (PFpW-6, PFpW-7), and Siphoviridae (PFpW-8) and had highly variable patterns of infectivity for different F. psychrophilum isolates (n=128). The stability tests of the phages in different waters, pHs and temperatures were assessed, and the results indicated that none of the phages were affected by ayu farm conditions. Among the phages, PFpW-3 had high infectivity for F. psychrophilum isolated from ayu and other fish and demonstrated sufficient survivability in the stability tests. Thus, PFpW-3 and its indicator strain N2-3 were inoculated into cytophaga broth at different doses of multiplicity of infection (MOI) and proved to be efficient for the reduction of bacterial growth. This study may be the basis for a further evaluation of phage therapy in the treatment of CWD in Japanese ayu farms.
Genetic Structure in Wild Populations of Ayu Plecoglossus altivelis in Korea and Japan
Han, Hyon-Sob,Taniguchi, Nobuhiko,Lee, Jong-Ha,Yoon, Moon-Geun The Korean Society of Fisheries and Aquatic Scienc 2011 Fisheries and Aquatic Sciences Vol.14 No.4
We investigated the genetic structure of Korean and Japanese ayu Plecoglossus altivelis populations by examining 669 individuals from 14 populations using three microsatellite loci. Genetic variation did not differ significantly among the populations examined in terms of allelic number and heterozygosity. Korean populations were genetically close to each other, implying that persistent gene flow has occurred in these populations. This suggests that eastern populations in Korea form a single large population and all of the Korean populations are distinct from the Japanese populations. Pairwise population $F_{ST}$ estimates, principal component analyses, and a neighbor-joining tree showed that genetic separation between the southern and pooled eastern coast populations was probably influenced by restricted gene flow. Hierarchical analysis of molecular variance (AMOVA) revealed a weak but significant genetic structure among three ayu groups (eastern and southern coasts of Korea and the Japan coast), and no genetic variation within groups. The estimated genetic population structure and potential applications of microsatellite markers may aid in the proper management of ayu populations.
Lee, Sang-Min,Kim, Kyoung-Duck,Park, Huem Gi,Lee, Jong Kwan,Lim, Yong-Su 한국수산학회 2002 Fisheries and Aquatic Sciences Vol.5 No.3
This study was conducted to investigate the utilization of Sargassum meal in the diet on juvenile ayu (Plecoglossus altivelis) reared in seawater. White fish meal and wheat flour were used as the dietary protein and carbohydrate sources in the control diet. Wheat flour in the control diet was replaced with 5% and 10% Sargassum meal. Three replicate groups of fish average weighing 4.0g were fed one of three isonitrogenous (45%) and isocaloric (14.5 MJ/kg diet) diets for 7 weeks. Survival of all groups were above 80%. Weight gain, feed efficiency and protein efficiency ratio were not significantly affected by dietary Sargassum meal levels (P>0.05). There were no significant differences (P>0.05) in moisture, crude protein, crude lipid, crude ash and fatty acid compositions of whole-body fish among groups. It is concluded that Sargassum meal could be used as a dietary additive or alternative low-cost dietary ingredient up to 10% for juvenile ayu reared in seawater.