Age class structure

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Analyzing fisheries age class structure

An age class structure with gaps in it, for instance a regular bell curve for the population of 1-5 year-old fish, excepting a very low population for the 3-year-olds, implies a bad spawning year 3 years ago in that species.

Often fish in younger age class structures have very low numbers because they were small enough to slip through the sampling nets, and may in fact have a very healthy population.

Fisheries science	Population dynamics of fisheries Shifting baseline Fish stock Fish mortality Condition index Stock assessment Fish measurement Standard weight in fish Fish counter Data storage tag Catch per unit effort Otolith microchemical analysis Biomass Fisheries acoustics Acoustic tag Coded wire tag GIS and aquatic science Pop-up satellite archival tag EcoSCOPE Age class structure Trophic level Trophic cascades Hydrographic containment Match/mismatch hypothesis Climate change and fisheries Marine biology Aquatic ecosystems Bioeconomics EconMult Ecopath FishBase Census of Marine Life OSTM/Jason-2 Fisheries databases Institutes Fisheries scientists
Wild fisheries	Ocean fisheries Diversity of fish Coastal fish Coral reef fish Demersal fish Forage fish Pelagic fish Cod fisheries Crab fisheries Eel fisheries Krill fisheries Kelp fisheries Lobster fisheries Shrimp fishery Eel ladder Fish ladder Fish screen Migration Salmon run Sardine run Shoaling and schooling Marine habitat Marine snow Water column Upwelling Humboldt current Algal blooms Dead zones Fish kill

Fisheries law, management, sustainability and conservation

Law	Fisheries law Exclusive economic zone Illegal, unreported and unregulated fishing United Nations Convention on the Law of the Sea United Nations Fish Stocks Agreement Fisheries Convention Magnuson–Stevens Act
Management	Fisheries management Monitoring control and surveillance Vessel monitoring system Fishery Resources Monitoring System Catch reporting Fisheries observer Catch share Individual fishing quota Minimum landing size Pulse fishing Slot limit EU Common Fisheries Policy EU MLS European Fisheries Control Agency National Marine Fisheries Service Regional fishery body Regional fishery management organisation
Sustainability	Sustainable fishery Maximum sustainable yield List of commercially important fish species Sustainable seafood Overfishing Environmental impact of fishing Fishing down the food web Destructive fishing practices Future of Marine Animal Populations The Sunken Billions The End of the Line Bycatch Discards Incidental catch Cetacean bycatch Turtle excluder device Shrimp-Turtle case
Conservation	Marine protected area Marine reserve Marine conservation Marine conservation activism Salmon conservation Grey nurse shark conservation Shark sanctuary European Environmental Agency U.S. Fish and Wildlife Service
Advocacy	FishAct Marine Stewardship Council Aquaculture Stewardship Council Friend of the Sea SeaChoice Seafood Watch Ocean Conservancy Ocean Outcomes Oceana Save Our Seas Foundation Sea Around Us WorldFish Defying Ocean's End HERMIONE PROFISH International Seafood Sustainability Foundation Sea Shepherd Conservation Society Greenpeace
Related issues	CalCOFI Fish slaughter Marine pollution Mercury in fish Shark culling Shark finning Threatened sharks Threatened rays
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Analyzing fisheries age class structure

See also