directed fisheries造句

• " both species of fish are being caught in substantial numbers through directed fisheries and as bycatch , but they are extremely vulnerable to exploitation , due to their slow growth , low reproductive rate , long gestation periods , and late maturity .
  这两个品种被人类大量猎杀，又经常成为间接渔获，加上其生长速率缓慢繁殖力低怀孕期长及迟熟，极易受滥捕的威胁。