Trophic transfer of micro- and nanoplastics and toxicity induced by long-term exposure of nanoplastics along the rotifer (Brachionus plicatilis)-marine medaka (Oryzias melastigma) food chain
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Brachionus calyciflorus
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The effects of two antibiotics,Chloromycetin and Nicotinic Norfloxacinum,on population growth of rotifer(Brachionus plicatilis) were studied by means of population accumulation culture.The population growth of rotifer was significantly(P0.01) affected when exposed to different doses of Chloromycetin,of which a concentration of 0.012 5 mg/mL could promote rotifer population to grow.When concentration increases between 0.025 0—0.050 0 mg/mL,however,the growth was inhibited,and the inhibition is significant at the concentration of 0.050 0 mg/mL.The dosage of Nicotinic Norfloxacinum affects rotifers' population growth significantly(P0.01),low dosage(0.25 and 0.50 mg/mL) promotes growth and high dosage(0.75 and 1.00 mg/mL) inhibits it.
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해산어류 종묘생산시 초기단계 먹이생물로서 많이 이용되고 있는 rotifer, Brachionus plicatilis의 large (L)-type, small (S)-type, thailand small (TS)-type에 대한 수온과 염분별 성장율, 최초산란 연령, 수명 및 총산란수 등에 관해 조사한 결과는 다음과 같다. 각 염분 %$(5\%o,\;15\%o,\;25\%o,\;and\;35\%o)$ 에...
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Mouth gape sizes of marine finfish larvae determine the size of rotifer prey that can be ingested, so providing appropriate size rotifers controls the success of larval rearing. It is difficult for hatcheries to maintain pure cultures of multiple rotifer species by long-term serial dilution without cross-contamination. In this paper, we describe a technique for utilizing multiple rotifer species in larviculture that uses rotifer diapausing eggs as inocula, enabling hatcheries to supply larval predators with optimally sized rotifers. Biodiversity in the Brachionus plicatilis species complex is extensive, including considerable variation in body size. In this paper, we show that large quantities of diapausing eggs can be produced from many Brachionus species. Using the full range of body size diversity from seven Brachionus species, we can produce adult female rotifers with mean body lengths as small as 137 μM, or as large as 305 μM, and neonate females with body lengths ranging from 103 to 206 μM. The length of diapausing eggs for small Brachionus species averaged 100 μM, and 166 μM for large species. Diapausing egg production varied by 3.6 fold among 14 strains. Using diapausing eggs of the very small rotifer Proales similis (88 μM) to inoculate mass cultures also is described.
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Rotifers are among the smallest metazoa in the world that have their own uniqueness. This research was conducted in order to find out if Brachionus plicatilis really can keep the best endurance towards the changes of salinity and does the changes of salinity will give effect towards growth rate of the rotifer species. The main aims for this study was to identify either the changes of the salinity give effects towards the growth rate of the Brachionus plicatilis. The second aim was to identify the best salinity for the growth rate of the Brachionus plicatilis and last but not least to produce mass production of Brachionus plicatilis. Generally, a batch culture method was used for the culturing of the rotifers. There were two batch culture where the first batch rotifer was cultured in20 ml of sea water while the second batch rotifer was cultured in 10 ml of sea water. A salinities of 12, 9, 5 and 0 ppt were applied to the second batch culture. The result obtained proved that the salinity does give effect towards the growth rate of the rotifer. Based from the result, it also showed that the salinity of 12 ppt was the best and optimum salinity for culture of rotifer for the aquaculture industry. The mass production of the rotifer was also a success. As a conclusion, the changes in salinity does give effect to the rotifer as it affect their growth rate.
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With neoated rotifer Brachionus plicatilis BZ]taken as the tested animal, the toxic effect of Cu++ and Zn++ ions on rotifer was examined at 25. The results show that rotifer was very sensitive to Cu++ ion with the 24h LC50s ranging from 14.47 g/L to 21.93 g/L, while rotifer was exposed to Zn++ ion with the 24h LC50s from 3.404 mg/L to 4.549 mg/L under the same experimental conditions.
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