Laboratory study of growth of the lobate ctenophore Bolinopsis mikado (Moser)
2002
"Kasuya, T. (Tokyo Univ. of Fisheries (Japan)) | Ishimaru, T. | Murano, M. "
"The laboratory growth rate of the lobate ctenophore Bolinopsis mikado was measured under various water temperatures and food concentrations using calanoid copepods of Acartia spp. as prey. Bolinopsis mikado developed its oral lobes when its total length (TL) reached about 6mm, and auricles at about 10 mm TL, becoming fully lobate without tentacles at about 15mm TL. Larval B. mikado grew with 3 Acartia I sup(-1) indicating that the larvae were capable of growth under lower food concentrations than the post-larvae. The instantaneous growth rate rapidly increased with a rise in water temperature from 17 to 21 deg C, and moderately increased over 21 deg C, reaching a maximum of about 0.7 d sup(-1) at 27 deg C. Net growth efficiency was about 90% at a TL of 15 mm and rapidly decreased with increases in TL at 24 deg and 27 deg C, suggesting that the investment of assimilated energy into egg production might be larger at higher temperatures. The growth curve obtained for B. mikado suggests that the life span of B. mikado in Tokyo Bay is less than one month during summer in contrast to more than 3 months during winter. The increase in growth rate and egg production rates of 6.mikado with higher water temperatures appears to allow their quick population growth and mass occurrence during summer/fall, and vice versa during winter/spring in Tokyo Bay."
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