grass carp scientifically known as ctenopharyngodon idella rests on a pristine white surface highlighting its scale

grass carp ctenopharyngodon idella freshwater fish breeds aquaculture aquatic life ichthyology food live anatomy species ecological impact farming sustainable fishing ecosystems river asian ornamental identification fisheries research biodiversity environmental studies habitat conservation biology industry behavior reproduction populations scales gills fins swimming breeding growth distribution introduction organisms recreational balance practices health ai generated