PORT PHILLIP BAY


Knifesnout Pipefish 

Hypselognathus rostratus (Waite & Hale, 1921)

View scientific description and taxonomy

Scientific Details

Meristics.
Dorsal fin spines/rays: 30-35
Anal fin spines/rays: 3.-4
Caudal fin rays: 10
Pectoral fin rays: 12-14
Body rings: 24-25 + 41-44
Subdorsal rings: 2.50-0.75 + 6.25-8.25 = 8.00-9.50

Interpreting fin count meristics.
Spines are in Roman numerals and soft rays are in Arabic numerals. Spines and rays that are continuous in one fin are separated by a comma. Fin sections are separated by semicolons.

Detailed descriptions of fin count and other meristics are in:
Gomon. M.F., Bray, D.J. & Kuiter, R.H. (eds) (2008) Fishes of Australia's Southern Coast. Sydney : Reed New Holland 928 pp.

Order level detail.
Mostly long, slender fishes with a small mouth at the end of a long tubular snout, although some species are deep-bodied. All are partially or completely encased in bony rings or dermal plates. Most are cryptically-coloured and often have dermal appendages providing further camouflage.

Family level detail.
A large and diverse group of pipefishes, seahorses, seadragons and pipehorses. All have semi-flexible bodies encased in bony rings and a tiny mouth at the end of a tubular snout. They lack fin spines and pelvic fins, and other the fins may be reduced or absent. Syngnathids have a unique reproductive mode. The sexes are separate and females deposit their eggs into special abdominal brood pouches or onto modified exposed regions under the trunk or tail of their male partner. The males incubate and nourish the developing embryos until they hatch. These extraordinary cryptic fishes are extremely well-camouflaged and often ornamentation such as filaments and other appendages on their bodies to closely resemble their surroundings.

Taxonomy

Phylum:
Chordata
Subphylum:
Craniata
Superclass:
Gnathostomata
Class:
Actinopterygii
Order:
Syngnathiformes
Suborder:
Syngnathoidei
Family:
Syngnathidae
Genus:
Hypselognathus
Species:
rostratus

General Description

Body long, slender; snout elongate, deep, compressed; body rings slightly elevated making the body surfaces slightly rough; tail not prehensile. Mostly brownish, plain or pale, mottled and blotched, sometimes with diffuse pale bars on the back. To 32 cm.

Biology

Juveniles are pelagic, remaining near the surface until more than 10 cm in length. In Port Phillip Bay, Victoria, they are commonly seen in association with large jellyfish when oceanic waters run into the Bay. Pregnant males have not been collected.

Habitat

Seagrass beds and adjacent sand flats in shallow coastal bays and estuaries, in depths of 0-10 m.

Soft substrates

Seagrass meadows

Distribution guide

South-eastern Australia.

Species Group

Fishes › Seahorses, pipefish and allies

Depth

Shallow (1-30 m)

Water Column

On or near sea floor

Max Size

32 cm

Commercial Species

No

Global Dispersal

Native to Australia

Identify

Conservation Status

  • DSE Advisory List : Not listed
  • EPBC Act 1999 : Not listed
  • IUCN Red List : Not listed
  • Fisheries Act 1995 : Protected Aquatic Biota

Author

article author Bray, D.J.

Di Bray is a Senior Collection Manager of ichthyology at Museum Victoria.

Author

article author Gomon, M.F.

Dr. Martin Gomon is a Senior Curator of ichthyology at Museum Victoria.

citation

Cite this page as:
Bray, D.J. & Gomon, M.F., 2011, Knifesnout Pipefish, Hypselognathus rostratus, in Taxonomic Toolkit for marine life of Port Phillip Bay, Museum Victoria, accessed 20 Apr 2024, http://136.154.202.208:8098/species/6307

Text: creative commons cc by licence