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Species · accepted · checked 2026-08-05

Argyropelecus sladeni

Lowcrest hatchetfish

WoRMS 158837ITIS 162221GBIF 2347588key worms:158837
i

2026-08-05: itis_id 162221 via WoRMS external link

Silhouette · João Pedro Fernandes Moutinho · CC0 1.0 · PhyloPic, drawn from Argyropelecus olfersii
Lowcrest hatchetfish7 cm
US quarter2.4 cm

max · worms_attribute

Argyropelecus sladeni
Photo · Unspecified, Texas A&M University at Galveston · CC BY 3.0 · commons

Argyropelecus sladeni, or Sladen's hatchetfish, is a species of ray-finned fish in the family Sternoptychidae, found in the tropical and subtropical Atlantic, Indian and Pacific Oceans. This small fish lives in the mesopelagic zone by day and makes a daily vertical migration to the epipelagic zone at night.W CalCOFI holds 2,453 observations of it in 2 datasets between 1959 and 2023, as larva.R

2,453
observations
2,453
records
2,453
sampling events
1959–2023
years
2
datasets
larva
life stages

Observed in
i

One row per dataset, 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.

  • Ichthyoplankton 2,398 obs · 2,398 events · 1959–2023 · larva
    name used: Argyropelecus sladeni Lowcrest hatchetfish · code 105
  • Mesopelagic Fish 55 obs · 55 events · 2010–2012
    name used: Argyropelecus sladeni · code Argyropelecus sladeni

How big is it
i

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.

Ways in
i

Read from taxa.json of release v2026.09.11, written at release by calcofi4db::build_taxa_catalog(). The catalog's index is /species/.

Explorerdb-query
ERDDAPCalCOFI's own server, the Ichthyoplankton table constrained to this taxon
https://erddap.calcofi.io/erddap/tabledap/swfsc_ichthyo.html?&taxon_key=%22worms:158837%22