{"elementGlobalId":100799,"circumscripConfidence":null,"classificationLevel":{"id":8,"classificationLevelNameEn":"Subspecies","classificationLevelNameEs":"Subespecie","classificationLevelNameFr":"Sous-espèce"},"classificationStatus":{"id":1,"classificationStatusDescEn":"Standard","classificationStatusDescEs":"Estándar","classificationStatusDescFr":"Standard"},"iucn":{"id":1,"iucnDescEn":"Extinct","iucnDescEs":"Extinto","iucnDescFr":"Disparue","iucnCode":"EX"},"nameCategory":{"id":1,"nameCategoryDescEn":"Vertebrate Animal","nameCategoryDescEs":"Animal vertebrado","nameCategoryDescFr":"Animal vertébré","nameTypeCd":"A","nameTypeDesc":"Zoological"},"rankMethodUsed":{"id":4,"rankMethodUsedDescEn":"Expertise without calculation","rankMethodUsedDescEs":null,"rankMethodUsedDescFr":null,"rankMethodUsedExternalDescEn":"Ranked by inspection","rankMethodUsedExternalDescEs":null,"rankMethodUsedExternalDescFr":null},"formattedScientificName":"<i>Salvelinus fontinalis agassizii</i>","scientificName":"Salvelinus fontinalis agassizii","scientificNameAuthor":"(Garman, 1885)","primaryCommonName":"Silver Trout","relatedItisNames":"<i>Salvelinus agassizii</i> (Garman, 1885) (TSN 553390)","uniqueId":"ELEMENT_GLOBAL.2.100799","elcode":"AFCHA05070","conceptRefFullCitation":"Lee, D. S., C. R. Gilbert, C. H. Hocutt, R. E. Jenkins, D. E. McAllister, and J. R. Stauffer, Jr. 1980. Atlas of North American freshwater fishes. North Carolina State Museum of Natural History, Raleigh, North Carolina. i-x + 854 pp.","conceptName":"<i>Salvelinus agassizi</i>","taxonomicComments":"Considered to be a subspecies of <i>Salvelinus fontinalis</i> by Nelson et al. (2004) and Page et al. (2013); recognized as a species in Catalog of Fishes (Eschmeyer et al. 2006, 2019; Fricke et al. 2025). Original spelling is <i>agassizii</i>.","roundedGRank":"TX","conservationStatusFactorsEditionDate":"2012-08-04","conservationStatusFactorsEditionAuthors":"Deaton, J., & G. Hammerson","primaryCommonNameLanguage":"EN","recordType":"SPECIES","elementNationals":[{"elementNationalId":167792,"classifConfidence":null,"nation":{"id":225,"nameEn":"United States","nameEs":"Estados Unidos","nameFr":"États-Unis","isoCode":"US","region":"United States"},"roundedNRank":"NX","elementSubnationals":[{"elementSubnationalId":387587,"subnation":{"id":37,"nameEn":"New Hampshire","nameEs":"New Hampshire","nameFr":"New Hampshire","subnationCode":"NH","dnationId":225},"roundedSRank":"SX","dataSensitive":{"id":2,"dataSensitiveDescEn":"No","dataSensitiveDescEs":null,"dataSensitiveDescFr":null,"dataSensitiveCode":"N"},"dataSensitiveCategory":null,"srank":"SX","speciesSubnational":{"elementSubnationalId":387587,"hybrid":false,"exotic":false,"native":true}}],"nrankReviewYear":1996,"nrank":"NX","speciesNational":{"elementNationalId":167792,"exotic":false,"native":true}}],"lastModified":"2026-10-02T21:34:35.933974Z","lastPublished":"2026-10-02T21:32:08.892226Z","promotionalDescription":null,"conceptLineageSummary":null,"nsxUrl":"/Taxon/ELEMENT_GLOBAL.2.100799/Salvelinus_fontinalis_agassizii","grankAdjustmentReasons":null,"grankChangeDate":"1996-09-12","grankReviewDate":"2012-08-04","grankReasons":"Known from Dublin Pond, New Hampshire; last known capture was in 1930 (six specimens); decline apparently was due to overfishing and competition with other fishes.","grank":"G5TXQ","rankInfo":{"elementGlobalId":100799,"aooPercentGood":null,"enviromentalSpecificity":null,"intrinsicVulnerability":null,"longTermTrend":null,"numberEos":{"id":16,"numberEosDescEn":"0 (zero)","numberEosDescEs":"0 (cero)","numberEosDescFr":"0 (zéro)"},"numberGoodEos":null,"numberProtEos":null,"popSize":{"id":38,"popSizeDescEn":"Zero, no individuals known extant","popSizeDescEs":"Cero, se desconoce si hay individuos existentes","popSizeDescFr":"Zéro, aucun individu ne semble exister"},"rangeExtent":{"id":37,"rangeExtentDescEn":"Zero (no occurrences believed extant)","rangeExtentDescEs":"Cero (no se detecta presencia)","rangeExtentDescFr":"Zéro (aucune présence détectée)"},"shortTermTrend":null,"threatImpactAssigned":null,"rangeExtentComments":"Known with certainty only from Dublin Pond, Cheshire County, southwestern New Hampshire. Page and Burr (2011) mentioned that this fish occurred in Dublin Pond and in \"nearby\" ponds.","areaOfOccupancy":null,"areaOfOccupancyComments":null,"numberEosComments":"No occurrences, subpopulations, or locations remain.","popSizeComments":null,"viabilityComments":null,"threatImpactComments":"Decline probably was related to overfishing and competition with yellow perch and brook trout.","shortTermTrendComments":null,"longTermTrendComments":null,"inventoryNeeds":"None.","numberProtEosComments":null,"protectionNeeds":"None.","otherConsiderations":null,"intrinsicVulnerabilityComments":null,"enviromentalSpecificityComments":null},"animalCharacteristics":{"elementGlobalId":100799,"majorHabitat":{"id":2,"majorHabitatDescEn":"Freshwater","majorHabitatDescEs":"Agua dulce","majorHabitatDescFr":"Eau douce"},"nonMigrant":false,"localMigrant":false,"longDistanceMigrant":false,"mobilityMigrationComments":null,"foodHabitsComments":null,"animalPhenologyComments":null,"colonialBreeder":false,"length":null,"width":null,"weight":null,"animalPhenologies":[],"animalFoodHabits":[]},"occurrenceDelineations":[{"eoSpecsDetailId":1154,"locationUseClass":{"id":1,"locationUseClassDescEn":"Not applicable","locationUseClassDescEs":"No se aplica","locationUseClassDescFr":"Sans objet","displayOrder":1},"eoSpecGroupName":"Nonanadromous Salmonids","subtypes":"Spawning Area","inferredExtentDistance":null,"inferredExtentNotes":null,"minimumEoCriteria":"Occurrences are based on evidence of historical presence, or current and likely recurring presence, at a given location. Such evidence minimally includes collection or reliable observation and documentation of one or more individuals (including eggs and larvae) in appropriate habitat.","mappingGuidance":"Conceptually, the occurrence includes the entire area used by the population, including spawning, rearing, migration, and wintering areas. Occupied locations that are separated by a gap of 10 km or more of any aquatic habitat that is not known to be occupied represent different occurrences. However, it is important to evaluate migrations and seasonal changes in habitat (see separation justification) to ensure that spawning areas and nonspawning areas for a single population are not artificially segregated as different occurrences simply because there have been no collections/observations in an intervening area that may exceed the separation distance.","separationBarriers":"Dam lacking a suitable fishway; high waterfall; upland habitat.","separationDistanceUnsuitableHabitatat":null,"separationDistanceSuitableHabitatat":null,"altSeparationProcedure":"Separation distance is 10 stream-km for both suitable and unsuitable habitat. However, if it is known that the same population occupies sites separated by more than 10 km (e.g., this may be common for migratory populations), those sites should be included within the same occurrence. In lakes, occurrences include all suitable habitat that is presumed to be occupied (based on expert judgment), even if documented collection/observation points are more than 10 km apart.  Separate sub-occurrences or source features may usefully document locations of critical spawning areas within a lake.<br>","separationJustification":"Separation distance is arbitrary; little is known about juvenile dispersal (e.g., how far fishes may move between between their embryonic developmental habitat and eventual spawning site). \"Restricted movement is the norm in populations of stream salmonids during nonmigratory periods,\" but there is considerable variation in movements within and among species (Rodriguez 2002). <br><br>Migrations can be extensive. For example, in the Kennebecasis River, New Brunswick, brook trout moved upstream 65-100 km in spring after ice loss; summer movements were minimal; movements to spawning areas in fall were less than 10 km, then the fish moved back downstream to wintering areas in the lower to middle reaches of the river (Curry et al. 2002). <br><br>Because of the difficulty in defining suitable versus unsuitable habitat, especially with respect to dispersal, and to simplify the delineation of occurrences, a single separation distance is used regardless of habitat quality.","versionDate":"2003-03-11","versionAuthor":"Hammerson, G.","versionNotes":null,"lastModified":"2020-04-30T02:04:34.535954Z"}],"plantCharacteristics":null,"elementManagement":{"elementGlobalId":100799,"eoManagementGroupName":null,"stewardshipOverview":null,"impacts":null,"restorationPotential":null,"siteConservationPlansConsidered":null,"managementMethods":null,"monitoringMethods":null,"managementProgramContacts":null,"monitoringProgramContacts":null,"managementResearchPrograms":null,"managementResearchNeeds":null,"biologicalResearchNeeds":"None.","additionalTopics":null},"occurrenceViabilities":[{"eoRankSpecsDetailId":102365,"eoRankSpecsGroupName":null,"locationUseClass":{"id":1,"locationUseClassDescEn":"Not applicable","locationUseClassDescEs":"No se aplica","locationUseClassDescFr":"Sans objet","displayOrder":1},"excellentViability":null,"goodViability":null,"fairViability":null,"poorViability":null,"viabilityJustification":"Use the Generic Guidelines for the Application of Occurrence Ranks (2008).<br>The Key for Ranking Species Occurrences Using the Generic Approach provides a step-wise process for implementing this method.","versionDate":null,"versionAuthor":null,"versionNotes":null,"lastModified":"2020-05-14T02:17:16.642153Z"}],"references":[{"id":508433,"citation":"California Academy of Sciences. 2006. April 17-last update. The Catalog of Fishes. Online. Available: http://www.calacademy.org/research/ichthyology/catalog/fishcatsearch.html.","shortCitationAuthor":"California Academy of Sciences","shortCitationYear":2006,"referenceCode":"N06CAS01EHUS","lastModified":"2020-02-25T18:12:39.444986Z"},{"id":117765,"citation":"Eschmeyer, William N. (editor). 1998. Catalog of fishes. Volumes 1-3. California Academy of Sciences, San Francisco, California. 958 pp. Updates available online at: https://research.calacademy.org/research/ichthyology/catalog/fishcatmain.asp","shortCitationAuthor":"Eschmeyer","shortCitationYear":1998,"referenceCode":"B98ESC01EHUS","lastModified":"2022-07-02T00:46:21.765671Z"},{"id":1002702,"citation":"Eschmeyer, W. N. and R. Fricke, and R. van der Laan (eds). 2018. Catalog of Fishes electronic version: genera, species, references. (http://researcharchive.calacademy.org/research/ichthyology/catalog/fishcatmain.asp). Electronic version: 30 April 2018.","shortCitationAuthor":"Eschmeyer et al.","shortCitationYear":2018,"referenceCode":"W18ESC01NAUS","lastModified":"2020-02-25T18:13:48.867894Z"},{"id":641946,"citation":"Jelks, H. L., S. J. Walsh, N. M. Burkhead, S. Contreras-Balderas, E. Díaz-Pardo, D. A. Hendrickson, J. Lyons, N. E. Mandrak, F. McCormick, J. S. Nelson, S. P. Platania, B. A. Porter, C. B. Renaud, J. Jacobo Schmitter-Soto, E. B. Taylor, and M.L. Warren, Jr. 2008. Conservation status of imperiled North American freshwater and diadromous fishes. Fisheries 33(8):372-407.","shortCitationAuthor":"Jelks et al.","shortCitationYear":2008,"referenceCode":"A08JEL01NAUS","lastModified":"2020-02-25T14:38:12.147906Z"},{"id":104497,"citation":"Lee, D. S., C. R. Gilbert, C. H. Hocutt, R. E. Jenkins, D. E. McAllister, and J. R. Stauffer, Jr. 1980. Atlas of North American freshwater fishes. North Carolina State Museum of Natural History, Raleigh, North Carolina. i-x + 854 pp.","shortCitationAuthor":"Lee et al.","shortCitationYear":1980,"referenceCode":"B80LEE01NAUS","lastModified":"2020-02-25T14:38:12.158121Z"},{"id":101590,"citation":"Miller, R. R., J. D. Williams, and J. E. Williams. 1989. Extinctions of North American fishes during the past century. Fisheries 14(6):22-38.","shortCitationAuthor":"Miller et al.","shortCitationYear":1989,"referenceCode":"A89MIL01NAUS","lastModified":"2020-02-25T18:11:58.350566Z"},{"id":146098,"citation":"Mills, D. 1989. Ecology and management of Atlantic salmon. Chapman and Hall, London. 351 pp.","shortCitationAuthor":"Mills","shortCitationYear":1989,"referenceCode":"B89MIL01NAUS","lastModified":"2020-02-25T18:13:48.867894Z"},{"id":379642,"citation":"Nelson, J. S., E. J. Crossman, H. Espinosa-Perez, L. T. Findley, C. R. Gilbert, R. N. Lea, and J. D. Williams. 2004. Common and scientific names of fishes from the United States, Canada, and Mexico. American Fisheries Society, Special Publication 29, Bethesda, Maryland. 386 pp.","shortCitationAuthor":"Nelson et al.","shortCitationYear":2004,"referenceCode":"B04NEL01NAUS","lastModified":"2020-02-25T14:20:12.297935Z"},{"id":672870,"citation":"Page, L. M., and B. M. Burr. 2011. Peterson field guide to freshwater fishes of North America north of Mexico. Second edition. Houghton Mifflin Harcourt, Boston. xix + 663 pp.","shortCitationAuthor":"Page and Burr","shortCitationYear":2011,"referenceCode":"B11PAG01NAUS","lastModified":"2020-02-25T14:38:12.158121Z"},{"id":756145,"citation":"Page, L. M., H. Espinosa-Pérez, L. T. Findley, C. R. Gilbert, R. N. Lea, N. E. Mandrak, R. L. Mayden, and J. S. Nelson. 2013. Common and scientific names of fishes from the United States, Canada, and Mexico. Seventh edition. American Fisheries Society, Special Publication 34, Bethesda, Maryland.","shortCitationAuthor":"Page et al.","shortCitationYear":2013,"referenceCode":"B13PAG01NAUS","lastModified":"2020-02-25T14:20:12.282291Z"},{"id":116264,"citation":"Rodriguez, M. A. 2002. Restricted movement in stream fish: the paradigm is complete, not lost. Ecology 83(1):1-13.","shortCitationAuthor":"Rodriguez","shortCitationYear":2002,"referenceCode":"A02ROD01NAUS","lastModified":"2020-02-25T14:38:17.064201Z"}],"otherCommonNames":[],"speciesGlobal":{"elementGlobalId":100799,"cites":null,"cosewic":null,"fwsRegion":null,"genusSize":{"id":3,"genusSizeDescEn":"Small genus","genusSizeDescEs":"Género pequeño","genusSizeDescFr":"Petit genre"},"jurisEndem":{"id":1,"jurisEndemDescEn":"endemic to a single state or province","jurisEndemDescEs":"Endémico de un estado o provincia","jurisEndemDescFr":"Endémique à un État ou à une province"},"nomenclaturallyEst":null,"usesa":null,"informalTaxonomy":{"informalTaxonomyId":9,"level1":"Animals","level2":"Vertebrates","level3":"Fishes - Freshwater and Anadromous Bony, Cartilaginous; Lampreys","level":3,"hasChildren":false,"parentId":2,"distributionStatus":"complete","displayOrder":1120},"parentSpecies":{"parentSpeciesId":103972,"uniqueId":"ELEMENT_GLOBAL.2.103972","formattedScientificName":"<i>Salvelinus fontinalis</i>","scientificName":"Salvelinus fontinalis","primaryCommonName":"Brook Trout","lastModified":"2020-02-25T14:38:23.143733Z","nsxUrl":"/Taxon/ELEMENT_GLOBAL.2.103972/Salvelinus_fontinalis"},"infraspecies":true,"kingdom":"Animalia","phylum":"Craniata","taxclass":"Actinopterygii","taxorder":"Salmoniformes","family":"Salmonidae","genus":"Salvelinus","americanFisheriesStatus":"Extinct","americanFisheriesStatusDate":"2008-08-01","saraStatus":null,"saraStatusDate":null,"cosewicDate":null,"interpretedCosewic":null,"cosewicComments":null,"usesaDate":null,"interpretedUsesa":null,"usesaComments":null,"completeDistribution":true,"synonyms":[{"id":111761,"synonym":"Salvelinus agassizi","synonymAuthor":"(Garman, 1885)","formattedSynonym":"<i>Salvelinus agassizi</i>"},{"id":126796,"synonym":"Salvelinus agassizii","synonymAuthor":"(Garman, 1885)","formattedSynonym":"<i>Salvelinus agassizii</i>"}],"infraspeciesList":[],"ebarId":null,"ebarCanadianScope":false,"ebarGlobalScope":false,"ebarKbaGroup":"Fishes","caGeneralStatusId":null},"speciesCharacteristics":{"elementGlobalId":100799,"reproductionComments":null,"ecologyComments":null,"habitatComments":"This species inhabited a small, clear, cold, deep lake fed by bottom springs in the Connecticut River drainage (Lee et al. 1980).","generalDescription":null,"diagnosticCharacteristics":null,"speciesMarineHabitats":[],"speciesTerrestrialHabitats":[],"speciesRiverineHabitats":[],"speciesPalustrineHabitats":[],"speciesLacustrineHabitats":[{"cagLacusHabId":-100323,"lacustrineHabitat":{"id":1,"lacustrineHabitatDescEn":"Deep water","lacustrineHabitatDescEs":"Aguas profundas","lacustrineHabitatDescFr":"Eau profonde","displayOrder":1}},{"cagLacusHabId":-100324,"lacustrineHabitat":{"id":2,"lacustrineHabitatDescEn":"Shallow water","lacustrineHabitatDescEs":"Aguas poco profundas","lacustrineHabitatDescFr":"Eau peu profonde","displayOrder":2}}],"speciesSubterraneanHabitats":[],"speciesEstuarineHabitats":[]},"primaryReference":{"id":672870,"citation":"Page, L. M., and B. M. Burr. 2011. Peterson field guide to freshwater fishes of North America north of Mexico. Second edition. Houghton Mifflin Harcourt, Boston. xix + 663 pp.","shortCitationAuthor":"Page and Burr","shortCitationYear":2011,"referenceCode":"B11PAG01NAUS","lastModified":"2020-02-25T14:38:12.158121Z"},"predecessors":[],"elementGlobalThreatAssessments":[]}