{"refrec":{"BRefID":137140,"RR":"<b>Hirayama, K.; Watanabe, K.; Kusano, T.</b> (1973). Fundamental studies on physiology of rotifer for its mass culture: III. Influence of phytoplankton density on population growth. <i>Bull. Jpn. Soc. Sci. Fish 39(11)</i>: 1123-1127","BEntID":130960,"PublicFlag":1,"CheckedFlag":0,"wosflag":1,"vabbflag":null,"RefStringPartII":". <i>Bull. Jpn. Soc. Sci. Fish 39(11)</i>: 1123-1127","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Hirayama, K.; Watanabe, K.; Kusano, T.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Hirayama, K. <i>et al.</i>","Englishabstract":"The population growth of the rotifer, <i>Brachionus plicatilis</i> cultured with a marine sp of <i>Chlorella</i> suspended at various densities was investigated. Experiments were performed by culturing many individuals in many test tubes each containing 2 individuals in the experimental medium. From daily counts of eggs laid and surviving individuals, time intervals from hatching to 50 per cent survival and to peak of fecundity, net reproduction rate, intrinsic rate of population increase and mean generation time were estimated. The results obtained are summarized as follows. (1) The values of the indices concerning population growth of the rotifer indicate that for its mass production the marine <i>Chlorella</i> should be kept always at the density of 85-213 x 10<sup>4</sup> cells/ml, where 150 x 10<sup>4</sup> cells/ml may be the most desirable because of the highest values of intrinsic rate of population increase and net reproduction rate. (2) Population growth of the rotifer can be restrained in <i>Chlorella</i> suspension even at the density (less than 213 x 10<sup>4</sup> cells/ml) where the rotifer cannot reach a satiated condition. (3) The wt and vol of the <i>Chlorella</i> were estimated at 7.1 x 10<sup>-6</sup> µg and 1 x 10<sup>-8</sup> mm<sup>3</sup> per average cell, respectively. Therefore, the most suitable density for population growth of the rotifer is estimated as 10.7µg/ml or 1.5 x 10<sup>-2</sup> mm<sup>3</sup>/ml.","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"Fundamental studies on physiology of rotifer for its mass culture: III. 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