Totalallowable catch - EU waters, shared between EU countries as quotas.
Legal upper limits
Species specific
All fish landings documented
Fines
Meshnets are made of diamond mesh that closed under tension. Some contain escape hatches and acoustic deterrents.
The number and size of boats and nets is restricted, the number of days at sea is also controlled.
Notake zones are areas with bans on fishing, allowing breeding by legally designating areas of conservation - exclusionzones.
Closed seasons are bans on fishing during particular times of the year - salmon14th feb ---> 30th sep.
Minimum catch sizes allow greater recruitment (biomass) before capture.Undersized fish are returned and minimum net sizes. Only works if length correlates with sexual maturity.
Populationseeding is when young fish are raised and released to be later caught.
Biodegradable nets mean that there is less chance of any lost nets ghost fishing.
Streamers deter seabirds from baited hooks - albatross
Setting lines at night reduces birds caught.
Pole and line fishing is very specific so little bycatch and carried out by local people.