Vol. 37 No. 1, 1998
and Hydrographic Variations of Ichthyoplankton Density and Composition
in the Kuroshio Edge Exchange Area off Northeastern Taiwan
Jiunn-Bin Huang and Tai-Sheng Chiu*
Department of Zoology, National Taiwan University, Taipei, Taiwan 106
Jiunn-Bin Huang and Tai-Sheng Chiu (1998)
A total of 327 ichthyoplankton samples were taken during 14 cruises
from June 1989 to September 1992 in the waters off northeastern Taiwan.
The density of ichthyoplankton was lowest in winter, increased in
spring, reached the maximum in summer, and declined in autumn. Average
densities in the 3 hydrographic ecotopes indicate that the
ichthyoplankton density was highest in the East China Sea Shelf (ECS),
moderate in the Kuroshio Current (KUR), and lowest in the mixing zone
(MIX). In total, 59 789 individuals of ichthyoplankton assigned to at
least 124 families and 547 species were collected. The major
ichthyoplankton species, comprising about 60% of the total catch, were
distinctive in different seasons and waters. Decapterus spp. (14.01%)
and Auxis spp. (6.23%) were abundant in spring; Auxis spp. (6.91%) and
Benthosema pterotum (5.80%) in summer; B. pterotum (55.23%), gobiids
(4.14%), and Synagrops sp. (3.17%) in autumn; and B. pterotum (15.35%)
and Gonostoma gracile (7.48%) in winter. The abundant ichthyoplankton
species in the 3 hydrographic ecotopes were B. pterotum (22.98%) and
Auxis spp. (5.11%) in ECS; Decapterus spp. (28.60%) and Auxis spp.
(7.10%) in MIX; and B. pterotum (5.61%) and Vinciguerria nimbaria
(4.43%) in KUR. The dendrogram based on major ichthyoplankton species
exhibits 7 species-associated groups.
Key words: Larval fish, East China Sea Shelf, Kuroshio.
*Correspondence: Tel: 886-2-23630231 ext. 2128. Fax: 886-2-23634014.