Individual growth rates of salps in three populations

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Abstract
One of the fastest growing planktonic species, the salp T. democratica, was analyzed for growth rate in 3 different oceanic blooms in winter, summer and spring. Each bloom was marked by a pair of drogues and sequentially sampled to obtain a series of length frequencies in each population through time. The length frequencies were analyzed by an improved method of modal analysis. Length-specific growth rate was calculated from the progression through time of the resulting series of modes. The blooms showed average growth per individual of 10.4, 14.7 and 19.8% in length/h in winter, summer and spring, respectively. These growth rates in the field are compared with growth rates obtained previously in the laboratory, and the reasons for the varying estimates of growth rate in the literature are examined.

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