K. M. Gorbatenko and N. T. Dolganova
Pacific Scientific Fishery Center, Vladivostok, Russia
e–mail: dolganova@tinro.ru
Received December 29, 2005; in final form, May 30, 2006
Abstract—A comparison of the qualitative and quantitative characteristics of zooplankton caught by five dif-
ferent types of plankton nets was performed on the basis of the data of plankton surveys in various high pro-
duction zones of the Pacific Ocean (392 zooplankton samples) in order to determine conversion coefficients for
a more adequate quantitative estimation of plankton. In epipelagic zones, both the abundance and biomass of
zooplankton caught by a Juday net were practically everywhere higher as compared to those estimated with the
use of JuOM and Norpak nets but lower than the values obtained with Bongo nets. For the sake of the compar-
ison of the quantitative estimations with different nets, we suggest coefficients equal to the ratios of the zoop-
lankton biomass from a Juday net to the biomasses from other nets: from 0.4 to 1.5 for the total biomass values
and from 0.3 to 2.3 for individual groups of zooplankton. The coefficients applied at the TINRO to account for
the plankton underhauling with big Juday nets are reasonable and reliable for most of the dominating groups
except for chaetognats, which are twice overestimated.
DOI: 10.1134/S0001437007020075
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