5.8 impacts of overfishing

fisheries

where you commercially fish

fishery collapse

when overfishing causes 90% decline in pop. in a fishery

pop may never recover due to decreased biodiv, inability to find mates, inbreeding depression

economic consequence of fishery collapse

lost income for fishermen, lost tourism

economic impact of overfishing

leads to sharp loss of profits

tragedy of the commons

bottom trawling

harmful by dragging big net in the ocean floor

bycatch

unintended species caught in nets like dolphin turtle etc

decreases biodiv by killing non. target species and removing coral reef habitats

fishing down the food web and trophic cascade

as we deplete large, predatory fisheries, we move down to smaller fish species

depletion of smaller fish pops limits fish recovery and decreases food supply of marine mammals and seabirds (food chain)