{{Short description|Species of ray-finned fish}} {{Speciesbox | status = LC | status_system = IUCN3.1 | status_ref = <ref name="iucn status 19 November 2021">{{cite iucn |author=Russell, B. |author2=Clements, K.D. |author3=Choat, J.H. |author4=Rocha, L.A. |author5=Myers, R. |author6=Lazuardi, M.E. |author7=Muljadi, A. |author8=Pardede, S. |author9=Rahardjo, P. |date=2012 |title=''Haletta semifasciata'' |volume=2012 |article-number=e.T190674A17773869 |doi=10.2305/IUCN.UK.2012.RLTS.T190674A17773869.en |access-date=19 November 2021}}</ref> | image = Blue Weed-whiting, The Esplanade, Flinders VIC 3929, Australia imported from iNaturalist photo 32265267 (cropped).jpg | display_parents = 2 | parent_authority = Whitley, 1947 | taxon = Haletta semifasciata | authority = (Valenciennes, 1840) | synonyms = * ''Odax semifasciatus'' <small>Valenciennes, 1840</small> * ''Julis dringii'' <small>J. Richardson, 1843</small> * ''Odax richardsonii'' <small>Günther, 1862</small> * ''Odax hyrtlii'' <small>Steindachner, 1866</small> | synonyms_ref = <ref name = Fishbase>{{Fishbase|Haletta|semifasciata|month=August|year=2019}}</ref> }}
The '''blue weed whiting''' (''Haletta semifasciata'') is a species of ray-finned fish, a weed whiting from the family Labridae,<ref name="ECoF">{{Catalog of Fishes|family=Hypsigenyinae|access-date=18 July 2025}}</ref> which is endemic to Australia where it is only found along the southern coast. It is found in brackish and marine waters in sheltered locations at depths of from {{convert|1|to|7|m|ft}}. This species inhabits areas with a substrate of sand with beds of seagrass where it feeds on small invertebrates and algae and the seagrasses themselves. This species grows to a length of {{convert|29|cm|in}} SL. It is of minor importance to local commercial fisheries. This species is the only known member of its genus.<ref name = Fishbase/>
== Gallery == <gallery mode="packed"> File:Blue Weed-whiting, The Esplanade, Flinders VIC 3929, Australia imported from iNaturalist photo 32265256.jpg File:Blue Weed-whiting, The Esplanade, Flinders VIC 3929, Australia imported from iNaturalist photo 32265361.jpg File:Blue Weed-whiting, Victoria, Australia imported from iNaturalist photo 108832605.jpg File:Haletta semifasciata.jpg </gallery>
==References== {{Reflist}}
{{Taxonbar|from=Q1938564}}
Category:Labridae Category:Taxa named by Achille Valenciennes Category:Fish described in 1840
{{Labridae-stub}}