• Title, Summary, Keyword: R. notatus

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Early Developmental Characteristics of Induced Hybrids between Rhodeus uyekii and R. notatus (Pisces: Cyprinidae) (각시붕어(Rhodeus uyekii)와 떡납줄갱이(R. notatus) (Pisces: Cyprinidae) 잡종의 초기 발생 특징)

  • Kang, Eon-Jong;Kim, Chi-Hong;Park, In-Seok;Yang, Hyun;Cho, Yong-Cheol
    • Korean Journal of Ichthyology
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    • v.18 no.4
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    • pp.339-346
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    • 2006
  • In this study we conducted artificial hybridization between two sibling species, Rhodeus uyekii and R. notatus, and observed the morphological characteristics in early developmental stage. The two species showed difference in egg shape having rhombus and club respectively. The morphology of yolk of larva just hatched also showed well specific characteristics, that is the bean chaff type for R. uyekii (U type) and anchor type for R. notatus (N type). The rate of fertilization between female R. uyekii and male R. notatus (UN type) and between female R. notatus and male R. uyekii (NU type) were complete and its hatching rate were very high, 71.6% for UN type and 97.5% for NU type. The differences occurred in the yolk shape of hatched larvae for each combination of hybrids. In the group of UN, U type of larvae were found very rarely, but almost all the larvae showed intermediate shape polarized to NN type. Similar phenomenon was observed in the NU having intermediate polarized to UU, but without any NN type. These hybrids will be analyzed for their external morphology, sex ratio, the function of sexual organ and karyology after they grown up to adult.

Morphometric Traits and Cytogenetic Analysis in Induced Cross and Reciprocal Hybrid between Rhodeus uyekii and R. notatus (각시붕어 Rhodeus uyekii와 떡납줄갱이 R. notatus 간 정교배체, 상반교배체의 계측형질과 세포유전학적 분석)

  • Kim, Bong-Seok;Kang, Eon-Jong;Jang, Hyuk;Park, In-Seok
    • Korean Journal of Ichthyology
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    • v.24 no.3
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    • pp.151-159
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    • 2012
  • Cross and reciprocal hybrids from intrageneric crosses between Rhodeus uyekii and R. notatus were analyzed morphometrically using truss and classical dimensions, erythrocyte size using blood smears, and cytogenetically using flowcytometry, then compared with the parental species. Although the morphometric assessment based on body proportions indicated that the hybrids were generally intermediate between the maternal and paternal species, the morphometric characters of cross and reciprocal hybrids included at least 14 paternal-like and 7 maternal-like, and 13 paternal-like and 5 maternal-like characters, respectively (P<0.05). The pigmentation of the hybrids was intermediate in some respects, and resembled that of the parental species. The DNA content of the cross and reciprocal hybrids, based on flow cytometry analysis, was significantly different from the parental species. The characterization of morphometric traits and the cytogenetic analysis of hybrids of R. uyekii and R. notatus used in this study may be useful for distinguishing genotypes in commercial Acheilognathinae aquaculture.

Genetic Identification of Hybrids between Rhodeus uyekii and R. notatus by Sequence Analysis of RAG-1 Gene (RAG-1 유전자의 염기서열 분석에 의한 각시붕어 Rhodeus uyekii와 떡납줄갱이 R. notatus 잡종의 동정)

  • Yun, Young-Eun;Lee, Il-Ro;Park, Sang-Yong;Kang, Eon-Jong;Kim, Eung-O;Yang, Sang-Keun;Nam, Yoon-Kwon;Bang, In-Chul
    • Journal of Aquaculture
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    • v.22 no.1
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    • pp.79-82
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    • 2009
  • Reciprocal interspecific hybrids between two bitterling species Rhodeus uyekii (RU) and R. notatus (RN) were genetically identified based on the partial sequence analysis of recombination activating gene-1 (RAG-1) gene. Out of 863 bp positions analyzed, 13 nucleotide substitutions were detected between the two parental species (RU and RN genotypes). Both the induced hybrids (RU female$\times$RN male; UN genotype) and their reciprocal counterparts (RN female$\times$RU male; NU genotype) displayed the double peaks (or polymorphism) of sequence chromatograms at the 13 diagnostic positions, indicating that those hybrids were actual karyogamy derived from the two parental haploid genomes. However, it was not possible to distinguish between the reciprocal interspecific hybrids.

Ontogenetic Color Variation of Abudefduf notatus (Pomacentridae: Perciformes) Revealed by 16S rRNA Sequences Analysis (미토콘드리아 16S rRNA 염기서열 분석에 의해 밝혀진 동갈자돔 치어의 성장에 따른 체색변이)

  • Song, Young Sun;Kim, Jin-Koo
    • Korean Journal of Ichthyology
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    • v.25 no.2
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    • pp.53-58
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    • 2013
  • Seven individuals (16.1~29.1 mm in length) which were estimated with fishes of genus Abudefduf were collected in Seogwipo, Jeju Island in the summer of 2011 and 2012. Among them, five individuals (20.8~29.1 mm SL) are similar to Abudefduf notatus, based on morphological characters such as yellow transverse band on the body, one small black spot on the base of the pectoral fin, and yellow caudal fin. On the other hand, two individuals (16.1 mm, 17.0 mm SL) differ from them in several light transverse bands and transparent rays of all fins except for pelvic fin, and anterior transparent head with only one (16.1 mm). According to the results of molecular analyses of 578 base pairs of mtDNA 16S rRNA sequences, these individuals correspond to A. notatus adult, with a high bootstrap value of 95% (genetic distance, d=0.002). Therefore, this study shows that the individuals more than 20.8 mm similar to adult body color but the 16.1 mm individual differs to that of adult. We confirm that this species changes to body color during their early life stages. This result regards as a survival strategy to protect themselves against their predator during their early life stages.

Species Occurrence and Food Chain of Fisheries Resources, Nekton, on the Coast of Pukchon, Cheju Island 1. Species composition and diversity (제주도 북촌연안 수산자원유영생물의 출현과 먹이연쇄에 관한 연구 1. 종조성과 다양도)

  • GO You-Bong;SHIN Heau-Sub
    • Korean Journal of Fisheries and Aquatic Sciences
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    • v.21 no.3
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    • pp.131-138
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    • 1988
  • Collection of organisms for the fisheries resources community were obtained with a set net during 8 months between May, 1985 and May, 1986 on the coast of Pukchon, Cheju Island, Korea. Most of organisms, representing 36 species, were less than 20cm $(93\%)$ in length, and 130g $(91\%)$ in weight. The four most abundant species were jack mackerel, Trachurus japonicus ; squid, Todarodes pacificus : damsel fish, Chromis notatus : and rabbit fish, Siganus fuscescens, which comprised about $83\% in number and about $73\%$ of the total catch. The diversity index of the number of species and information indices for individual and catch were the highest in October and the lowest in Septemer, indicating a close relationship with the change between the species number and catch at that time. A cluster analysis of 17 species was illustrated from the similarity matrix. All of the 17 species were grouped at the 0.2 similarity level. Three groups were present at 0.60 level, whereas species in other groups were sporadic in occurrence.

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