This research shows that the careful protection given by a fish father to his young, can be undone by anglers. While the father is captured, he cannot defend his young from predators.
The exhaustion and stress caused can lead him to abandonment. Other research has shown that fish, once released, have a risk of dying from their traumatic encounter.
"Black bass spawn in shallow nests in the spring, and following egg deposition the males remain alone to provide all parental care for the brood."
"Because they likely only forage opportunistically while defending their nest and because parental care can be energetically costly physiological disturbances are particularly detrimental to parental male black bass."
"During the parental care period, which may last up to five to six weeks, males are particularly vulnerable to angling because they vigorously defend their offspring from potential brood predators.
"When guarding males are removed by anglers, even for short periods of time, predators such as other small centrarchids or percids may quickly consume the offspring with cumulative predation levels being proportional to the length of time the fish is absent from the nest."
"Recent studies, however, indicate that the behavioral and physiological effects of exhaustive exercise, such as catch-and-release angling during the spawning period, may be stressful enough to cause abandonment of broods."