Argyropelecus affinis
Slender hatchetfish
i
2026-08-05: itis_id 162216 via WoRMS external link
Argyropelecus affinis is a species of ray-finned fish in the family Sternoptychidae, described by Garman in 1899, found in the tropical and subtropical Atlantic, Indian and Pacific Oceans. Common names for this fish include Pacific hatchetfish, deepsea hatchetfish and slender hatchetfish.W CalCOFI holds 1,041 observations of it in 2 datasets between 1959 and 2023, as larva.R
- 1,041
- observations
- 1,041
- records
- 1,041
- sampling events
- 1959–2023
- years
- 2
- datasets
- larva
- life stages
- 8.4 cm
- max length
Observed in 2 datasetsi
One row per dataset, and beside it one cell per year, darker with more observations — the same
strip the front door draws per dataset. Each row ends with the name that dataset uses
(dataset_taxon); the accepted name is written once, in the title above. A quiet
pill marks a name the authority does not accept.
i
One row per dataset, and beside it one cell per year, darker with more observations — the same strip the front door draws per dataset. Each row ends with the name that dataset uses (dataset_taxon); the accepted name is written once, in the title above. A quiet pill marks a name the authority does not accept.
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name used: Argyropelecus affinis Slender hatchetfish · code
103 -
name used: Argyropelecus affinis · code
Argyropelecus affinis
Ways inExplorerdb-queryERDDAPRPythonThis page as JSON
Code and endpoints ERDDAP · R · Python · JSON
library(calcofi4r) con <- cc_get_db() # the promoted release tbl(con, "obs_bio") |> filter(taxon_key == "worms:127307")
import calcofi4py as cc
con = cc.cc_get_db()
con.sql("SELECT * FROM obs_bio WHERE taxon_key = 'worms:127307'").df()Read from taxa.json of release v2026.10.20, written at release by calcofi4db::build_taxa_catalog(). The catalog's index is /species/.
How big is it 8.4 cm max · egg 0.92–1.04 mm
Every mark is a measured length with its own source — hover one to read it. The reference objects are _data/size_reference.csv: two of them, the 505 µm bongo mesh and the net's ring, are CalCOFI's own sampling gear.
Life stages larva
- Ichthyoplankton larva
The stages each dataset records for it, from the release's obs_bio.life_stage. Their lengths are under How big is it.
Lineage 13 ranks · Biota to Argyropelecus
Credits silhouette · photo · text · length · plate
- Silhouette · João Pedro Fernandes Moutinho · CC0 1.0 · PhyloPic, drawn from Argyropelecus olfersii · source
- Photo · Jules Richard · Public domain · commons · source
- Text · Wikipedia, “Argyropelecus affinis” · CC BY-SA 4.0 · revision 1314317887
- Length · worms_attribute
- Plate · Matarese, Kendall, Blood & Vinter 1989, NOAA Tech. Rep. NMFS 80, via the AFSC Ichthyoplankton Information System · Public domain (US Government work) · noaa_iis · source
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Elsewhere Wikidata · iNaturalist · FishBase
The same organism on the services the faces were fetched from; the authorities' own pages are the ids in the head.
Cite the release, v2026.10.20
Cite the release, v2026.10.20; each dataset's own citation, licence and DOI are on its page. How to cite ↗