Fisheries science
Fisheries science studies fish populations, fishing activities, and aquatic ecosystems to guide sustainable harvests and conservation.
Fish stock assessment: The estimation of a fish population’s size, productivity, and response to fishing. It combines catch, survey, and biological data to assess a stock’s condition.
Population dynamics: The study of how populations change through births, deaths, immigration, and emigration. These processes determine how fish stocks grow and respond to harvest.
Total allowable catch: A legally or administratively set maximum quantity of a fish stock that may be caught during a period. Stock assessments often inform the catch limits used to regulate fisheries.
Single-species fisheries management: Fisheries management that assesses and regulates each target species largely as a separate stock. It contrasts with ecosystem approaches that account for interactions among species and habitats.
Climate change and fisheries: The effects of long-term climate change on fish populations, fisheries, and aquatic ecosystems. Shifting distributions and productivity can make historical stock relationships unreliable.
Maximum sustainable yield: The largest long-term average catch that can be taken from a population under specified conditions. It provides a harvest target, though real ecosystems make the estimate uncertain.
Recruitment (fisheries science): The addition of young fish to a population or fishery, commonly when they reach a defined age or size. Recruitment variability strongly influences future stock abundance and catches.
Ecosystem-based fisheries management: Fisheries management that considers interactions among species, habitats, people, and environmental conditions. It extends decisions beyond single-stock abundance to ecosystem effects and dependencies.
Precautionary principle: A decision principle that supports protective action when credible risks exist despite scientific uncertainty. It shapes how managers respond when stock data are limited or uncertain.
Shifting baseline syndrome: The gradual acceptance of degraded environmental conditions as normal because each generation uses a different reference point. Changing expectations can obscure how far fish populations have declined from historical abundance.