if the food that an animal eats decreases in amount then that animal will lack food & some animals eat fish for food ->  if fish decrease in amount then animals that eat fish will lack food  if the population of an animal decreases then the amount of that animal will decrease & a fish is a kind of animal ->  if the population of fish decreases then the amount of fish will decrease  if the population of fish decreases then the amount of fish will decrease & too much fishing causes the fish population to decrease in an area ->  too much fishing causes the amount of fish in an area to decrease  if fish decrease in amount then animals that eat fish will lack food & too much fishing causes the amount of fish in an area to decrease ->  too much fishing can cause some animals that eat fish to lack food  too much fishing can cause some animals that eat fish to lack food & lack of food causes starvation ->  too much fishing can cause starvation for some animals that eat fish  too much fishing can cause starvation for some animals that eat fish & starvation can decrease animal population ->  starvation can decrease the population of animals that eat fish  starvation can decrease the population of animals that eat fish & decreasing in population can cause the population to be low & endangered means low in population -> starvation of the animals that eat fish can endanger those animals