Age class structure

This article needs additional citations for verification. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed.
Find sources: "Age class structure" – news · newspapers · books · scholar · JSTOR (May 2017) (Learn how and when to remove this message)

Age class structure in fisheries and wildlife management is a part of population assessment. Age class structures can be used to model many populations including trees and fish. This method can be used to predict the occurrence of forest fires within a forest population.^[1] 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,^[2] or teeth for a few species.^[3]^[4] Each method has its merits and drawbacks. Fish scales are easiest to obtain, but may be unreliable if scales have fallen off the fish and new ones grown in their places.^[5] 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,^[2] but obtaining them requires killing the fish.^[6] Also, otoliths often require more preparation before ageing can occur.^[5]

Analyzing fisheries age class structure

An example of using age class structure to learn about a population is a regular bell curve for the population of 1-5 year-old fish with a very low population for the 3-year-olds. An age class structure with gaps in population size like the one described earlier implies a bad spawning year 3 years ago in that species^[7]^{[citation needed]}.

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.^[8]

References

^ Wagner, C. E. Van (1978-06-01). "Age-class distribution and the forest fire cycle". Canadian Journal of Forest Research. 8 (2): 220–227. doi:10.1139/x78-034. ISSN 0045-5067.
^ ^a ^b O’Sullivan, Sandra (2007). Fisheries Long Term Monitoring Program. Brisbane, Australia: Queensland Department of Primary Industries and Fisheries.
^ Field, I.C., Meekan, M.G. & Bradshaw, C.J.A. (2009). Development of non-lethal methods for determining age and habitat use of sawfishes from northern Australia. Australia: Australian Department of the Environment and Energy.
^ Helfman, Gene; Collette, Bruce B.; Facey, Douglas E.; Bowen, Brian W. (2009-04-09). The Diversity of Fishes - Biology, Evolution, Andecology 2E (PDF). Oxford: Wiley-Blackwell UK. ISBN 9781405124942.
^ ^a ^b "MANUAL OF FISHERIES SCIENCE Part 2 - Methods of Resource Investigation and their Application". www.fao.org. Retrieved 2018-03-24.
^ Lux, Fred E. "Age Determination in Fishes". Washington, DC, United States: United States Bureau of Commercial Fisheries. Available at http://spo.nmfs.noaa.gov/Fishery%20Leaflets/leaflet488.pdf. Accessed 24/03/2018.
^ Botsford, Louis W.; Holland, Matthew D.; Samhouri, Jameal F.; White, J. Wilson; Hastings, Alan (2011). "Importance of age structure in models of the response of upper trophic levels to fishing and climate change". ICES Journal of Marine Science. 68 (6): 1270–1283. doi:10.1093/icesjms/fsr042.
^ Haines, Terry A. (1990). Intensive Studies of Stream Fish Populations in Maine. Washington, D.C., USA: U.S. Environment Protection Agency, Office of Acid Deposition, Environmental Monitoring and Quality Assurance. p. 17.

Fishery science topics

Fisheries science and wild fisheries

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
Outline of fishing Index of fishing articles Glossary of fishery terms

This ecology-related article is a stub. You can help Wikipedia by expanding it.

Read other articles:

Anang Dwitono

Anang Dwitono Danpussenkav Kodiklat TNI ADMasa jabatan18 Agustus 2015 – 7 Maret 2017 PendahuluMulyantoPenggantiAna Supriatna Informasi pribadiLahir22 Juli 1962 (umur 61) Mojokerto, Jawa TimurAlma materAkademi Militer (1985)Karier militerPihak IndonesiaDinas/cabang TNI Angkatan DaratMasa dinas1985—2020Pangkat Mayor Jenderal TNINRP30514SatuanKavaleriSunting kotak info • L • B Mayor Jenderal TNI (Purn.) Anang Dwitono, S.E. (lahir 22 Juli 1962) adalah seo...

Hisar Silaen

Ini adalah nama Batak Toba, marganya adalah Silaen. Letkol ChbHisar SilaenS.E. TNI Angkatan Darat Informasi pribadiLahir16 September 1978 (umur 45)Kisaran, Asahan, Sumatera Utara, IndonesiaKebangsaanIndonesiaSuami/istriNy. Karla Shinta NapituAnak1. Alexander Parulian Silaen2. Kezia Sartika Putri SilaenTempat tinggalJakartaAlma materAkademi Militer (2001)[1]Karier militerPihak IndonesiaDinas/cabang TNI Angkatan DaratMasa dinas2001—sekarangPangkat LetkolNRP1101005955097...

Manécanterie (Lyon)

Manécanterie de LyonFaçade ouest de la Manécanterie donnant sur la place Saint-Jean.PrésentationType ManécanterieStyle Roman, gothiqueConstruction XIIe sièclePropriétaire ÉtatPatrimonialité Classé MH (1862)LocalisationPays FranceSubdivision administrative RhôneCommune LyonCoordonnées 45° 45′ 38″ N, 4° 49′ 37″ ELocalisation sur la carte de FranceLocalisation sur la carte de Rhône-AlpesLocalisation sur la carte de Lyonmodifier...

Gloria Johnson (politician)

American politician (born 1962) Gloria JohnsonMember of the Tennessee House of RepresentativesIncumbentAssumed office January 8, 2019Preceded byEddie SmithConstituency13th district (2019–2023)90th district (2023–present)In officeJanuary 8, 2013 – January 13, 2015Preceded byHarry J. TindellSucceeded byEddie SmithConstituency13th district Personal detailsBorn (1962-05-25) May 25, 1962 (age 61)Denver, Colorado, U.S.Political partyDemocraticEducationUniversity of Tennessee...

Juan Ramón de la Fuente

Mexican politician In this Spanish name, the first or paternal surname is de la Fuente and the second or maternal family name is Ramírez. Juan Ramón de la FuenteJuan Ramón de la FuentePermanent Representative of Mexico to the United NationsIncumbentAssumed office 18 February 2019PresidentAndrés Manuel López ObradorPreceded byJuan José Gómez CamachoRector of the National Autonomous University of MexicoIn office1999–2007Preceded byFrancisco Barnés de CastroSucceeded byJos�...

العلاقات السورية الفرنسية

يفتقر محتوى هذه المقالة إلى الاستشهاد بمصادر. فضلاً، ساهم في تطوير هذه المقالة من خلال إضافة مصادر موثوق بها. أي معلومات غير موثقة يمكن التشكيك بها وإزالتها. (ديسمبر 2018) العلاقات السورية الفرنسية سوريا فرنسا تعديل مصدري - تعديل العلاقات الفرنسية السوري�...

نادي اتحاد الشرطة (مصر)

لمعانٍ أخرى، طالع نادي الشرطة (توضيح). اتحاد الشرطة شعار نادي اتحاد الشرطة الاسم الكامل اتحاد الشرطة الرياضي الاسم المختصر الشرطة تأسس عام 1980[1] الملعب ستاد العباسية القاهرة، مصر(السعة: 5000) البلد مصر الدوري الدوري المصري القسم الثالث 2017-2018 المركز الثالث الإدار...

Pratt & Whitney R-1830 Twin Wasp

Pratt & Whitney R-1830 Twin Wasp adalah mesin pesawat Amerika yang banyak digunakan pada tahun 1930-an dan 1940-an. Diproduksi oleh Pratt & Whitney, mesin itu dua baris, 14-silinder, desain radial berpendingin udara. Sebanyak 173.618 mesin R-1830 dibangun, dan dari penggunaannya dalam dua pesawat yang paling banyak diproduksi yang pernah dibangun, bomber B-24 dan transportasi DC-3, mesin ini mungkin yang paling banyak yang dibangun dari mesin piston lain di sejarah penerbangan. Versi...

Tea for Three (film)

1927 film Tea for ThreeLobby cardDirected byRobert Z. LeonardScreenplay byGarrett GrahamF. Hugh HerbertRoi Cooper MegrueLucille NewmarkStarringLew CodyAileen PringleOwen MooreCinematographyAndré Barlatier -(French Wikipedia)Edited byWilliam LeVanwayProductioncompanyMetro-Goldwyn-MayerDistributed byMetro-Goldwyn-MayerRelease date October 29, 1927 (1927-10-29) Running time70 minutesCountryUnited StatesLanguageEnglish Tea for Three is a lost[1][2] 1927 American co...

Giant Steps

This article is about the John Coltrane album. For the composition on the first track of this album, see Giant Steps (composition). For other uses, see Giant Steps (disambiguation). 1960 studio album by John ColtraneGiant StepsStudio album by John ColtraneReleasedFebruary 1960 (1960-02)[1][2][3]RecordedMay 4–5, 1959December 2, 1959StudioAtlantic StudiosNew York City[4]GenreJazzpost-bophard bopLength37:03LabelAtlanticProducerNesuhi ErtegunJoh...

ソー (オー＝ド＝セーヌ県)

Sceaux 行政国フランス地域圏 (Région) イル＝ド＝フランス地域圏県 (département) オー＝ド＝セーヌ県郡 (arrondissement) アントニー郡小郡 (canton) 小郡庁所在地INSEEコード 92071郵便番号 92330市長（任期）フィリップ・ローラン（2008年-2014年）自治体間連合 (fr) メトロポール・デュ・グラン・パリ人口動態人口 19,679人（2007年）人口密度 5466人/km2住民の呼称 Scéens地理座標北緯48度4...

Steyr

Para el fusil de asalto, véase Steyr AUG. Steyr Ciudad estatutaria Vista del casco antiguo Escudo SteyrLocalización de Steyr en Alta Austria SteyrLocalización de Steyr en AustriaCoordenadas 48°03′00″N 14°25′00″E / 48.05, 14.416666666667Entidad Ciudad estatutaria • País Austria • Estado Alta AustriaSuperficie • Total 26.56 km²Altitud • Media 310 m s. n. m.Población (2004) • Total 39 094 hab....

Northeast Illinois Council

Council of the Boy Scouts of America This article relies excessively on references to primary sources. Please improve this article by adding secondary or tertiary sources. Find sources: Northeast Illinois Council – news · newspapers · books · scholar · JSTOR (March 2021) (Learn how and when to remove this message) Northeast Illinois CouncilOwnerBoy Scouts of AmericaHeadquartersVernon Hills, IllinoisCountryUnited StatesFounded1971PresidentKenneth Morris...

Eric Harris and Dylan Klebold

American mass murderers (1981–1999) Eric Harris redirects here. For other people, see Eric Harris (disambiguation). Eric Harris and Dylan KleboldHarris (left) and Klebold (right) in their 1999 senior year portraitsBornEric David Harris(1981-04-09)April 9, 1981Wichita, Kansas, U.S.Dylan Bennet Klebold(1981-09-11)September 11, 1981Lakewood, Colorado, U.S.Died(1999-04-20)April 20, 1999 (aged 18 and 17)Columbine, Colorado, U.S. (both)[1]Cause of deathSuicide by gunshot wound (both)...

Divinyl ether

See also: enol ether Divinyl ether Names Preferred IUPAC name (Ethenyloxy)ethene Other names divinyl ether, divinyl oxide, ethenoxyethene, vinyl ether Identifiers CAS Number 109-93-3 3D model (JSmol) Interactive image ChEBI CHEBI:81293 ChEMBL ChEMBL2105883 ChemSpider 7733 ECHA InfoCard 100.003.383 EC Number 203-720-5 KEGG C17721 PubChem CID 8024 UNII 2H2T044E11 UN number 1167 CompTox Dashboard (EPA) DTXSID5074555 InChI InChI=1S/C4H6O/c1-3-5-4-2/h3-4H,1-2H2Key: QYKIQEUNHZKYBP-UHFFFAOYSA-N...

Miguel de Cervantes Prize

Award for exemplary contributions to literature in the Spanish language AwardMiguel de Cervantes PrizeMedal of the Miguel de Cervantes PrizeCountrySpainPresented byMinistry of CultureReward(s)€125,000First awarded1976WebsiteCervantesPresentacion The Miguel de Cervantes Prize (Spanish: Premio de Literatura en Lengua Castellana Miguel de Cervantes) is awarded annually to honour the lifetime achievement of an outstanding writer in the Spanish language. History The prize was established in 1975...

Оппенгеймер. Триумф и трагедия Американского Прометея

У этого термина существуют и другие значения, см. Оппенгеймер (значения). Оппенгеймер. Триумф и трагедия Американского Прометеяангл. American Prometheus Жанр биография Автор Кай Берд Мартин Дж. Шервин Язык оригинала английский Дата первой публикации 2004 Издательство Alfred A. Knopf АС...

Bruce Sundlun

American politician (1920–2011) Bruce Sundlun71st Governor of Rhode IslandIn officeJanuary 1, 1991 – January 3, 1995LieutenantRoger N. BeginRobert WeygandPreceded byEdward D. DiPreteSucceeded byLincoln Almond Personal detailsBornBruce George Sundlun(1920-01-19)January 19, 1920Providence, Rhode Island, U.S.DiedJuly 21, 2011(2011-07-21) (aged 91)Jamestown, Rhode Island, U.S.Political partyDemocraticSpouses Madeleine Eisner Schiffer Gimbel (m. 19...

Congress of the People (South African political party)

Political party in South Africa Congress of the People PresidentMosiuoa LekotaChairpersonTeboho LoateSecretary-GeneralDiratsagae Alfred KganareSpokespersonvacantDeputy PresidentvacantDeputy Secretary GeneralvacantFounders Mosiuoa Lekota Mbhazima Shilowa Mluleki George Founded16 December 2008; 15 years ago (2008-12-16)Split fromAfrican National CongressHeadquarters34–36 Fricker Road, Illovo, GautengStudent wingCOPE Students MovementYouth wingCOPE Youth MovementWomen's ...

FC Blau-Weiß Linz

FC Blau-Weiss LinzTên đầy đủFußball Club Blau-Weiss LinzThành lập2 tháng 7 năm 1997; 27 năm trước (1997-07-02)SânLinzer StadionSức chứa21,005Người quản lýThomas SagederGiải đấuGiải bóng đá hạng nhất quốc gia Áo2016-2017Giải bóng đá hạng nhất quốc gia Áo, vị trí thứ 7Trang webTrang web của câu lạc bộ Màu áo sân nhà Màu áo sân khách FC Blau-Weiss Linz là một câu lạc bộ bóng đá ở Giải b�...