Medialuna californiensis
Halfmoon
i
2026-08-05: itis_id 169522 via WoRMS external link
The halfmoon, also known as the blue perch, is a species of marine ray-finned fish, a sea chub from the family Scorpididae. It is native to the coasts of the eastern Pacific Ocean off western North America.W CalCOFI holds 386 observations of it in 1 dataset between 1951 and 2015, as larva.R
- 386
- observations
- 386
- records
- 386
- sampling events
- 1951–2015
- years
- 1
- datasets
- larva
- life stages
- 48 cm
- max length
Observed in 1 dataseti
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.
-
name used: Medialuna californiensis Halfmoon · code
666
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:281541")
import calcofi4py as cc
con = cc.cc_get_db()
con.sql("SELECT * FROM obs_bio WHERE taxon_key = 'worms:281541'").df()Read from taxa.json of release v2026.10.19, written at release by calcofi4db::build_taxa_catalog(). The catalog's index is /species/.
How big is it 48 cm max
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 12 ranks · Biota to Medialuna
Credits silhouette · photo · text · length
- Silhouette · perevolotsky · CC0 1.0 · PhyloPic, drawn from Microcanthus strigatus · source
- Photo · uwkwaj · CC BY-NC 4.0 · inat · source
- Text · Wikipedia, “Halfmoon” · CC BY-SA 4.0 · revision 1355294986
- Length · worms_attribute
Elsewhere Wikidata · iNaturalist · FishBase · GBIF
WikidataiNaturalistFishBaseGBIF
The same organism on the services the faces were fetched from; the authorities' own pages are the ids in the head.
Cite the release, v2026.10.19
Cite the release, v2026.10.19; each dataset's own citation, licence and DOI are on its page. How to cite ↗