• 제목/요약/키워드: rotifers

검색결과 162건 처리시간 0.027초

타우린 영양 강화 로티퍼 공급이 방어(Seriola quinqueradiata) 부화 자어의 성장 및 부레 팽창에 미치는 영향 (Taurine-enriched Rotifers Improve the Growth and Swim Bladder Inflation of Yellowtail Seriola quinqueradiata Larvae)

  • 김재훈;박진우;조정현
    • 한국수산과학회지
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    • 제55권5호
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    • pp.524-532
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    • 2022
  • We investigated the effects of taurine-enriched rotifers on larval growth and swim bladder inflation of yellowtail Seriola quinqueradiata. Rotifers were enriched with a commercial taurine supplement at two levels (0 and 800 mg/L). The larvae (initial notochord length=3.98±0.24 mm) were fed the enriched rotifers in triplicate from two days post-hatch for five days. The average taurine contents of the taurine non-enriched and enriched rotifers were 0.35±0.01 and 4.77±0.05 mg/g dry matter, respectively. The weight gain and specific growth rate of the fish fed enriched rotifers with the taurine supplement at 800 mg/L significantly improved compared with those of fish fed rotifers without taurine enrichment (P<0.05). The swim bladder inflation rate of larvae fed taurine enriched rotifers significantly (P<0.05). The results of the present study indicate that yellowtail larvae benefit from taurine concentrations compared with those typically reported to feed on non-taurine supplemented rotifers. Furthermore, taurine-enriched food for fish larval effectively improved the growth performance and swim bladder inflation of yellowtail larvae.

New record of two marine synchaetid rotifers (Monogononta: Synchaeta) from Korea

  • Yang, Hee-Min;Min, Gi-Sik
    • Journal of Species Research
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    • 제11권3호
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    • pp.174-179
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    • 2022
  • In this study, we identified two marine synchaetid rotifers, Synchaeta grimpei Remane, 1929 and S. vorax Rousselet, 1902, in Korea, which are the first synchaetid rotifers collected from a marine environment in the country. Prior to this study, all six synchaetids recorded in Korea were collected from freshwater environments. The morphological characteristics of both species are consistent with those recorded in previous studies of each species. Synchaeta grimpei is distinguished from other synchaetid rotifers by its cone-shaped body, wide and flat apical field, indistinct auricles, and long foot with two separated small toes. The morphological characteristics of Korean S. vorax specimens were most similar to the original description of Rousselet (1902), with its slender and cylindrical trunk shape, strongly convex apical field, and short foot with two small, separated toes. The rami of the Korean S. vorax specimen contained one frontal hook and several distinct and large teeth. Here, we provide the morphological diagnoses of the two synchaetid rotifers and the sequences of the partial mitochondrial cytochrome c oxidase subunit I (COI) of the two species.

고밀도 배양에 있어 먹이종류와 공급량 및 vitamin B12 첨가에 따른 담수산 rotifer (Brachionus calyciflorus)의 성장 (Effects of Food and Vitamin B12 on the Growth of a Freshwater Rotifer (Brachionus calyciflorus) in the High Density Culture)

  • 이균우;박흠기
    • 한국수산과학회지
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    • 제36권6호
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    • pp.606-613
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    • 2003
  • This study investigated the effects of food type (condensed freshwater Chlorella, dried Chlorella, dried Spirulina, dried Schizochytrium, baker's yeast and $\omega-yeast$) and amount, and supplementation of vitamin $B_{12}$ on the growth of freshwater rotifer (Brachionus calyciflorus) in high density culture. Growth of rotifers fed condensed freshwater Chlorella was the highest and its density ranged $7.65-8.14{\times}10^3\;inds./mL.$ The primary lipid acids of rotifers fed condensed freshwater Chloyella were linoleic and linolenic, and their amount ($\%$ of total fatty acids) were $48.8\%\;and\;26.8\%,$ respectively. This suggests that condensed freshwater Chlorella would be an effective diet for high quality and quantity rotifers, which in turn serve as live food for freshwater fish larvae. Growth rate of rotifers with Chlorella supplementation increased as amount of supplementation increased up to 1.5 and 2.5 mg at 28 and $32^{\circ}C$, respectively. However, undissolved ammonia toxicity and packing volume of Chlorella in culture medium, reached the optimal conditions for the stable and effective cultivation of rotifers when amount of condensed freshwater Chlorella was 1.5 mg in dry weight per 1,000 rotifers at $28^{\circ}C\;and\;32^{\circ}C$ Growth of rotifers in condensed freshwater Chlorella with vitamin $B_{12}$ supplementation was significantly higher than that of rotifers without supplementation. However, no significant difference was found among the different concentrations of vitamin $B_{12}.$ Therefore, vitamin $B_{12}$ could improve the growth of rotifers (B. calyciflorus).

Nutritional Value of Candida utitis for Rotifer and Larval Flounder Paralichthys olivaceus

  • Kim Hae Young;Kim Joong Kyun;Park Kyong-Joo;Bae Jean Hee;Hur Sung Bum
    • Fisheries and Aquatic Sciences
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    • 제8권4호
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    • pp.235-242
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    • 2005
  • Baker's yeast, Saccharomyces cerevisiae, has been widely used as a food organism for rotifers used in the larval production of marine fish. However, the nutritional value of the yeast is relatively poor compared with that of the marine alga Chlorella. We examined the nutritional value of another yeast, Candida utilis, and whether its food value could be increased through manipulation such as a cell wall treatment. Candida utilis and S. cerevisiae and their manipulated varieties were assessed with regard to the growth and nutrition of the rotifer Brachianus plicatilis. Larvae of the flounder Paralichthys alivaceus were cultured with rotifers fed on the yeast species, and the dietary value of the rotifers for the larvae was examined. Rotifers that were fed C. utilis grew faster than those provided with S. cerevisiae. Rotifers grew slightly faster on manipulated yeast than on non-manipulated yeast varieties. Of the two yeast species, C. utilis had better dietary value for rotifers. Flounder larvae cultured with rotifers that had fed on C. utilis displayed better growth and survival ($\%$) than did those cultured with rotifers that had fed on S. cerevisiae. Although the manipulated variety of C. utilis was better than the non-manipulated variety in terms of rotifer growth, the flounder larvae survived ($\%$) and grew better when they were fed rotifers that had eaten non-manipulated C. utilis. However, the nutritional value of this yeast species was still lower than that of Chlorella.

Five new records of monogonont rotifers from Korea

  • Song, Min Ok
    • Journal of Species Research
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    • 제7권4호
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    • pp.333-339
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    • 2018
  • Rotifers collected from Duung and Gyeongpo wetlands in Korea were investigated. Five species belonging to five genera in four families of monogonont rotifers were identified: Cephalodella ventripes (Dixon-Nuttall), Dicranophorus grandis (Ehrenberg), Lecane undulata Hauer, Taphrocampa selenura Gosse, and Testudinella emarginula (Stenroos). All these species are new to the Korean fauna, even though they have very wide or cosmopolitan distributions. The present study is the first report on the genus Taphrocampa Gosse from Korea. The taxonomy and distribution of each new Korean record are briefly discussed here. The diagnostic characteristics, photomicrographs and the deposition of voucher specimen are provided for each new Korean record.

한국산 쌍소(雙巢) 윤충류에 대한 계통분류학적 연구 (Taxonomic Study on the Digonont Rotifers of Korea)

  • 송민옥;김원
    • Animal Systematics, Evolution and Diversity
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    • 제12권1호
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    • pp.53-59
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    • 1996
  • 1994년 11월부터 1995년 12월까지 강릉대학교 인근의 이끼, 지의류, 부니질, 비온후 에 형성된 물 웅덩이 등에서 채집된 쌍소 윤충류를 동정한 결과 Rotaria tardigrada, Macrotrachela quadricornofera quadricormifera, Macrotrachela quadricormifera scutellata, Adineta vaga minor, Adineta steineri의 2과 2종 및 3아종들이 확인되어 이들을 모두 재기 재하고 도판을 작성하였다. 이것은 한국 최초의 쌍소 윤충류에 대한 분류학적 기록이다.

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Biological Application of Two Protozoan Species, Euplotes sp. and Vorticella sp., for the Stable Culture of the Rotifer Brachionus rotundiformis in Laboratory Experiments of Inter- and Tripartite-Specific Relations

  • Jung, Min-Min
    • Fisheries and Aquatic Sciences
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    • 제15권3호
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    • pp.209-213
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    • 2012
  • Members of the ciliate group of protozoans are often observed in mass cultures of rotifers. In particular, Euplotes and Vorticella are common contaminating species. In this study, I examined the effect of the ciliates Euplotes sp. and Vorticella sp. on the growth of the rotifer Brachionus rotundiformis by conducting inter-specific and tripartite-specific mixed-culture experiments. The growth of rotifers was suppressed in co-existence with Euplotes sp. compared with monocultures of rotifers. However, Vorticella sp. promoted rotifer growth. Moreover, Vorticella sp. improved the growth of rotifers suppressed by Euplotes sp. contaminants. In 5-L semi-mass cultures of rotifers, growth of the contaminating protozoan Euplotes sp. was heavily suppressed by Vorticella sp. The stable maintenance of the rotifer culture ecosystem can be achieved by manipulating the types of contaminating protozoan species.

Comparison of the Nutritional Value of Chlorella ellipsoidea and Nannochloris oculata for Rotifers and Artemia Nauplii

  • Cabrera Tomas;Bae Jean Hee;Bai Sungchul C.;Hur Sung Bum
    • Fisheries and Aquatic Sciences
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    • 제8권4호
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    • pp.201-206
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    • 2005
  • Microalgae are widely used for mass culture of the rotifer Brachionus plicatilis in aquaculture. Since the nutritional value of the rotifer is closely related to its food, the nutritional value of its food should be known in detail. Chlorella ellipsoidea and Nannochloris oculata are re­presentative food organisms for rotifers that are easily cultured. Therefore, the nutritional values of these micro algae were examined for ultrasmall, small, and large rotifers and Artemia nauplii. Chlorella ellipsoidea contained seven times more total fatty acids than N. oculata. The three types of rotifer fed N. oculata contained more amino acids than those fed C. ellipsoidea. However, the total fatty acids of the rotifers fed each microalga species differed according to the type of rotifer. Newly hatched Artemia nauplii contained more protein and had a higher dry weight than those fed microalgae for 6 h. As with the rotifers, the Artemia nauplii fed N. oculata contained more protein and amino acids than those fed C. ellipsoidea, while the reverse was true for the total fatty acid content. Our results suggest that N. oculata is a good supply of protein, while C. ellipsoidea is a good source of lipids as food organisms for rotifers and Artemia nauplii in aquaculture.

은어 자어 (Plecoglossus altivelis) 사육에 있어서 담수산 rotifer (Brachionus calyciflorus)의 먹이효과 (Food value or Freshwater Rotifer (Brachionus calyciflorus) for Culture of Sweetfish (Plecoglossus altivelis) Larvae)

  • 이균우;박흠기;이상민;한현섭;임영수
    • 한국수산과학회지
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    • 제37권1호
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    • pp.7-12
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    • 2004
  • This study investigated the possibility of salinity acclimation of freshwater rotifers (Brachionus calyciflorus) as live food for sweetfish (Plecoglossus altivelis) larvae, and also examined the optimal salinity for the growth of sweetfish. Freshwater rotifers cultured in 0 and 4 PSU and seawater rotifers (B. rotundiformis) cultured in 33 PSU were supplied to the larvae with four kinds of enrichment material (condensed freshwater Chlorella, $\omega-yeast,$ baker's yeast, Super Selco) and larval growth at 4 PSU was examined. Growth of the freshwater rotifers positively increased from 0 PSU to 6 PSU, but decreased when over 8 PSU was reached. Growth and survival of the sweet fish larvae reared in 0 PSU were significantly lower than those reared in either 4 PSU or 33 PSU. This indicated that the freshwater rotifers (B. calyciflorus) could be used as live food for sweetfish larvae reared in 4 PSU. The body weight of sweetfish larvae fed on freshwater rotifers enriched with Super Selco was the highest at 0.163 mg, but there was no significant difference in survival and body length of the fish fed with the other enrichment materials. The content of n-3 HUFA of the sweetfish larvae fed on the freshwater rotifers enriched with Super Selco and the condensed freshwater Chlorella was higher than that enriched with $\omega-yeast$ and baker's yeast. These results indicated that B. calyciflorus cultured with the condensed freshwater Chlorella could be used for the sweetfish larvae without enrichment, and the most efficient enrichment material for B. calyciflorus is Super Selco.

조피볼락의 종묘생산에 미치는 Rotifer와 Artemia의 영양강화 효과 (Effects of Enrichment of Rotifers and Artemia on Larvae Mass Productin of Rockfish, Sebastes schlegeli)

  • 조성환;허성범
    • 한국양식학회지
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    • 제11권4호
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    • pp.437-447
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    • 1998
  • 조피볼락 종묘생산시 발생하는 대량폐사를 막기 위하여 자어의 다양한 먹이생물을 공급하여 성장을 비교하였고 여러 가지 방법으로 먹이생물을 영양강화시켜 공급하여 그에 따른 조피볼락 자어의 생존율과 성장률을 비교하였다. 성게 유생은 쉽게 구할 수 있으나 조피볼락 자어의 생존율을 저하시켰고 유생의 지방산 분석 결과를 볼 때 그다지 적합한 먹이로 생각되지 않는다. Rotifer나 Artemia nauplii를 단독으로 조피볼락의 자어를 먹이로 공급하는 것보다 혼합공급하는 것이 더 효과저거인 것으로 나타났다. 그리고 rotifer나 Artemia nauplii를 ${\omega}$-yeast, Spirulina platensis나 Super Selco로 영양강화시킨후에 먹이로 공급할 경우 자어의 생존율이나 성장률에서 많은 개선을 보였다. Rotifer를 Super Selco로 영양강화를 시켰을 경우 $\omega$-yeast로 영양강화를 시킨 경우보다 높은 생존율과 성장률의 결과를 보였다. 산출 후 10일 경에 대량폐사가 발생하였으며 초기에는 rotifer가 자어의 먹이로 우수한 것으로 나타났으나 10일 경 이후부터는 Artemia nauplii가 우수한 먹이로 판단된다. 그러나 rotifer와 Artemia nauplii 혼합 공급하였을 경우 rotifer나 Artemia nauplii를 단독 공급하는 경우보다 우수한 결과를 보였다.

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