在黑龙江省的大小兴安岭、完达山脉的各大小水系中栖息繁衍着一种鳕科鱼种——山鳕(江鳕)。山鳕是淡水冷水性底栖鱼种,2～3龄性成熟,1～3月份在冰下进入生殖期。开河后进行索饵洄游湖入小河,栖息于水质清澈、底质为砂砾、水草遍生的河湾。夏至后游 In Heilongjiang Province, the size of the Hinggan Mountains, Wanda Mountains in various sizes of water systems inhabiting a Cod species - codfish (cod). Potherb mustard is freshwater chilled aquatic benthic fish, 2 to 3 years of age, 1 to March into the reproductive period under the ice. Proceed to the river after the bait migratory lake into the creek, habitat in clear water, sediment gravel, aquatic plants Bay. After the summer solstice