Fig. 1.
Total catch of a all fish species, b bronze gudgeon Coreius heterodon and yellow catfish Tachysurus fulvidraco, and c the four major carp species fry and Osbeck’s grenadier anchovy Coilia mystus below Gezhouba Dam in the mainstem Yangtze River. Note: All plotted fish species are commercially harvested and important economically in the Yangtze River. Osbeck’s grenadier anchovy is the most important fish species in the Yangtze River estuary. The four major carp species are grass carp Ctenopharyngodon idellus, black carp Mylopharyngodon piceus, bighead carp Hypophthalmichthys nobilis, and silver carp Hypophthalmichthys molitrix. The four major carp fry were monitored to assess the total amount of these species that are naturally spawned and to indicate the wild population condition of those species.