Fish mortality

Estimating natural mortality (M) is one of the most difficult and critical elements of a stock assessment (Hewitt et al. 2007).There are two basic approaches used to estimate natural mortality: tagging studies and growth parameters.Tagging studies are used in the Brownie Model, where multiyear tagging studies are used to estimate natural mortality based on recaptures: The Paulys Model (using growth parameters) is an indirect way of estimating natural mortality.Pauly’s original method was based on the correlation of M with von Bertalanffy growth parameters (K and L∞) and temperature (Gunderson 2002): In the Hoenigs method, M was inversely correlated with longevity across a wide variety of taxa (Hewitt and Hoenig 2005): Fishing mortality (F) can be estimated by dividing the catch by the mean stock size.Knowing these rates can help managers to set harvest limits to (MSY) maximum sustainable yield or (OSY) optimum sustainable yield to give the maximum benefit to the stakeholders of the resource.
fish killfisheries population dynamicsfish stockpredationpollutionfishingresource managementbioeconomicMortality ratePopulation dynamics of fisheriesFisheryFisheries sciencewild fisheriesFisheriesscienceShifting baselineCondition indexStock assessmentFish measurementStandard weight in fishFish counterData storage tagCatch per unit effortOtolith microchemical analysisBiomassFisheries acousticsAcoustic tagCoded wire tagGIS and aquatic sciencePop-up satellite archival tagEcoSCOPEAge class structureTrophic levelTrophic cascadesHydrographic containmentMatch/mismatch hypothesisClimate change and fisheriesMarine biologyAquatic ecosystemsBioeconomicsEconMultEcopathFishBaseCensus of Marine LifeOSTM/Jason-2WildfisheriesOcean fisheriesDiversity of fishCoastal fishCoral reef fishDemersal fishForage fishPelagic fishCod fisheriesCrab fisheriesEel fisheriesKrill fisheriesLobster fisheriesShrimp fisheryEel ladderFish ladderFish screenMigrationSalmon runSardine runShoaling and schoolingMarine habitatMarine snowWater columnUpwellingHumboldt currentAlgal bloomsDead zonesFisheries lawmanagementsustainabilityconservationExclusive economic zoneIllegal, unreported and unregulated fishingUnited Nations Convention on the Law of the SeaUnited Nations Fish Stocks AgreementFisheries ConventionMagnuson–Stevens ActFisheries managementMonitoring control and surveillanceVessel monitoring systemFishery Resources Monitoring SystemCatch reportingFisheries observerCatch shareIndividual fishing quotaMinimum landing sizePulse fishingSlot limitEU Common Fisheries PolicyEU MLSEuropean Fisheries Control AgencyNational Marine Fisheries ServiceRegional fishery bodyRegional fishery management organisationSustainable fisheryMaximum sustainable yieldList of commercially important fish speciesSustainable seafoodOverfishingEnvironmental impact of fishingFishing down the food webDestructive fishing practicesFuture of Marine Animal PopulationsThe Sunken BillionsThe End of the LineBycatchDiscardsIncidental catchCetacean bycatchTurtle excluder deviceShrimp-Turtle caseMarine protected areaMarine reserveMarine conservationMarine conservation activismSalmon conservationGrey nurse shark conservationShark sanctuaryEuropean Environmental AgencyU.S. Fish and Wildlife ServiceFishActMarine Stewardship CouncilAquaculture Stewardship CouncilFriend of the SeaSeaChoiceSeafood WatchOcean ConservancyOcean OutcomesOceanaSave Our Seas FoundationSea Around UsWorldFishDefying Ocean's EndHERMIONEPROFISHInternational Seafood Sustainability FoundationSea Shepherd Conservation SocietyGreenpeaceCalCOFIFish slaughterMarine pollutionMercury in fishShark cullingShark finningThreatened sharksThreatened raysOutline of fishingIndex of fishing articlesGlossary of fishery termsFisheriesAquacultureFish diseases and parasitesFish farmingArtisanal fishingFishermanFishing vesselHistory of fishingIndustryList of harvested aquatic animals by weightBy countryCommercial fishingMarketingMarketsProcessingProductsSeafoodRecreationAnglingBig-game fishingCatch and releaseFishing tournamentsFly fishingTechniquesFish trapFishfinderFishing netGathering seafood by handHandline fishingSpearfishingTrawlingTrollingTackleArtificial fliesBite indicatorsSinkerFish pondsFishing banksFishing villagesMarine habitatsBering Sea Anti-Poaching OperationsCoral poachingFreshwater eel poaching and smugglingArcticGlossaryOutline