Every summer, national park service officials lugged plastic jugs full of baby trout into north cascades national park. there, they placed the young fish in alpine lakes. the fish would grow and potentially become an angler's prized catch. to the dismay of fishing enthusiasts, however, fish stocking has come to an end. the decision came after a 12-year project review. researchers found that stocked trout ravage native salamanders and insects. angler advocates argue that stocking fish is no more harmful to the environment than clearing trails for hiking. yet the same park officials who previously stocked the lakes may have to remove them.
concerns ended the practice of fish stocking.
a commercial
b environmental
c financial
d ancestral