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Laboratory determined mortality fecundity and growth rates of thalia democratica and dolioletta gegenbauri tunicata thaliacea



Laboratory determined mortality fecundity and growth rates of thalia democratica and dolioletta gegenbauri tunicata thaliacea



Journal of Plankton Research 4(1): 143-154



Laboratory experiments are reported which provide information on culture conditions, mortality, fecundity and growth of T. democratica and D. gegenbauri in relation to simulated environmental conditions. Thaliaceans were maintained in laboratory culture at 20.degree. C. Culture vessels were 2.5 l glass bottles. Diets consisted of Isochrysis galbana and Peridinium trochoideum, offered alone or together at total concentrations of 0.25-0.70 mm3 .times. l-1. Laboratory released aggregate stages of Thalia were maintained for 1 wk and gonozooid, phorozooid and oozooid stages of Dolioletta were reared for up to 3 wk with daily mortality rates of 5-10%. There was no effect of diet on mortality rate. Thalia did not reproduce sexually, but Dolioletta did routinely. Each Thalia solitary released a mean (.+-.SE) of 54 .+-. 8 aggregates of 1.1-2.1 mm length. Each Dolioletta gonozooid produced 2-6 larvae 0.6-1.2 mm long, and each phorozooid released a mean of 31 .+-. 11 gonozooids. Aggregate growth was exponential for 7 days, with daily exponential growth coeffients (k) ranging from 0.03-0.36. Gonozooids grew exponentially for 17 days with a range of k from 0.08-0.25, and phorozooids grew exponentially for 5 days with k ranging from 0.17-0.69. There was no effect of food concentration on k. Generation times of Thalia and Dolioletta were estimated to be from 3-6 wk. These are probably maximum generation times for these 2 spp. in the Georgia Bight.

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