Age class structure

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Age class structure in fisheries and wildlife management is a part of population assessment. Age can be determined by counting growth rings in fish scales, otoliths, cross-sections of fin spines for species with thick spines such as triggerfish, or teeth for a few species. Each method has its merits and drawbacks. Fish scales are easiest to obtain, but may be unreliable if scales have fallen off of the fish and new ones grown in their places. Fin spines may be unreliable for the same reason, and most fish do not have spines of sufficient thickness for clear rings to be visible. Otoliths will have stayed with the fish throughout its life history, but obtaining them requires killing the fish. Also, otoliths often require more preparation before ageing can occur.

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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
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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
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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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