Ocean Science Journal

, Volume 41, Issue 4, pp 211–219

Spatial heterogeneity and long-term changes in bivalveAnadara broughtoni population: influence of river run-off and fishery


DOI: 10.1007/BF03020624

Cite this article as:
Silina, A.V. Ocean Sci. J. (2006) 41: 211. doi:10.1007/BF03020624


A comparison was made of population of the economically important cockleAnadara (=Scapharca)broughtoni (Bivalvia, Arcidae) inhabiting different areas of the Razdolnaya River estuary at the head of Amurskii Bay (Peter the Great Gulf, East Sea). Also, changes in cockle population density and structure, as well as in cockle growth rates during the last 20 years were studied. In all years of investigation, the morphometrical parameters and growth rates of cockles were smaller at the sites located close to the River mouth than farther down-estuary. The differences can be attributed to higher concentration of suspended particulate matter, decreased salinity and water temperature, as well as a longer exposure to these unfavorable environmental factors at sites located close to the River mouth, compared to farther sites. For two decades, cockle population density had decreased by almost 30 times at some sites in the River estuary. The main reason for this population decline is commercial over-fishing of the cockle. Besides, for the last 20 years, linear parameters of the cockles in the population decreased approximately by 30% and weight parameters, almost two times. Cockle growth rates also decreased for this period. Evidently, these facts are due to the damaging effect of dredging.

Key words

benthos trawling mollusk estuary spatial distribution age growth 

Copyright information

© Korea Ocean Research and Development Institute(KORDI) and the Korean Society of Oceanography(KSO) 2006

Authors and Affiliations

  1. 1.Institute of Marine Biology, Far East BranchRussian Academy of ScienceVladivostokRussia

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