http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Cabrera Tomas,Hur Sung Bum The Korean Society of Fisheries and Aquatic Scienc 2005 Fisheries and Aquatic Sciences Vol.8 No.4
Despite the relatively high production of fingerlings of the olive flounder Paralichthys olivaceus, its larval rearing in terms of first feeding has not been fully analyzed. We evaluated the variations of amino acids and fatty acids of starved larvae over 96 hr after hatching. We also investigated depletion of the yolk and oil globule of starved larvae and those fed the rotifer Brachionus plicatilis. In addition, the optimum size of the rotifers according to the mouth size of the larvae, and the point of no return with delay of the first feeding, were also examined. The amino acids in the egg decreased abruptly during embryo development. At 48 to 72 hr after hatching, the amino acids of starved larvae decreased by $30-40\%$ from the level in newly hatched larvae. The concentrations of fatty acids in newly hatched larvae were lower than those of floating eggs and dropped sharply at 48 hr after hatching, when the yolk disappeared. The starved larvae depleted their yolksacs and oil globules earlier than the fed larvae did. At 84 hr after hatching, rotifers were detected for the first time in the guts of the larvae, which were about 3 mm in total length. The point of no return appeared to be close to the fourth day from the first feeding. For a high survival rate of P. olivaceus larvae, the first feeding should occur before the third day after hatching.
Cabrera Tomas,Bae Jean Hee,Bai Sungchul C.,Hur Sung Bum The Korean Society of Fisheries and Aquatic Scienc 2005 Fisheries and Aquatic Sciences Vol.8 No.4
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.
Effects of Microalgae and Salinity on the Growth of Three Types of the Rotifer Brachionus plicatilis
Cabrera Tomas,Bae Jean Hee,Bai Sungchul C.,Hur Sung Bum The Korean Society of Fisheries and Aquatic Scienc 2005 Fisheries and Aquatic Sciences Vol.8 No.2
We investigated the effects of salinity and three food species of microalgae on the growth of three types of the rotifer Brachionus plicatilis, with the aim of improving mass culture of rotifers in hatcheries. Three types (large, small, and ultra-small) of the rotifer were cultured at 16 ppt and 32 ppt salinity with the green algae Chlorella ellipsoidea, Nannochloris oculata, or Tetraselmis tetrathele. The maximum density and specific growth rate were compared for each rotifer type. Ultra-small rotifers grew significantly faster at 16 ppt salinity than at 32 ppt, and C. ellipsoidea and T. tetrathele promoted significantly higher growth than did N. oculata. However, small rotifers grew significantly better at 32 ppt salinity than at 16 ppt, and small rotifers fed on N. oculata achieved the highest density at 1,185 individuals/ml. Large rotifers grew faster at 16 ppt salinity than at 32 ppt, with a diet of T. tetrathele resulting in the fastest growth. Each type of rotifer thrived under different regimens of microalgae and salinity.
개체배양에 의한 3 Types 윤충(Brachionus plicatilis) 의 수명 및 번식력
김현준,허성범,-- 한국수산학회 1993 한국수산과학회지 Vol.26 No.6
해산어류의 종묘생산시 초기 동물먹이생물로 널리 이용되는 미소형, 소형, 대형 윤충(Brachionus plicatilis)의 환경요인에 따른 수명과 번식력을 조사하였다. 전반적으로 온도는 25∼27℃가 20∼22℃ 보다 번식력과 수명이 높았으며 미소형과 소형 윤충은 이러한 현상이 더욱 뚜렷하였다. 염분은 미소형과 대형 윤충은 32ppt보다 16ppt에서 번식력이 더욱 높았던 반면 소형 윤충은 32ppt에서 더욱 높았다. 먹이생물은 미소형과 대형 윤충은 Tetraselmis tetrathele, 소형 윤충은 Chlorella ellipsoidea가 더 좋은 먹이 효율을 보였다. 각 윤충의 먹이생물, 수온, 염분에 따른 최고의 번식력은 미소형 윤충은 Tetraselmis tetrathele, 25-27℃, 16ppt, 소형 윤충은 Chlorella ellipsoidea, 25∼27℃, 32ppt, 대형 윤충은 Chlorella ellipsoidea, 25∼27℃, 16ppt에서 나타났다. The lifespan and fecundity of three types(ultra small, small and large) rotifer, Brachionus plicatilis, were investigated. Generally, the lifespan and fecundity of three types rotifer were better at 25∼27℃ than at 20∼22℃, and this phenomenon was more distinct in the ultra small and the small type rotifers. With regard to salinity, while the ultra small and the large type rotifer preferred low salinity(16ppt) to high salinity(32ppt), fecundity of the small type rotifer was higher at high salinity(32ppt) than at low salinity(16ppt). Suitable food organisms were Tetraselmis tetrathele and Chlorella ellipsoidea for the three types rotifer. Tetraselmis tetrathele was more adequate for the ultra small and large type rotifer as live food. However, Chlorella ellipsoidea showed better dietary value for the small type rotifer.