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Marjorie&;S Freshwater Hardyhead

Craterocephalus marjoriae Whitley 1948

Diagnostic Description

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Distinguished from Craterocephalus marianae and Craterocephalus munroiand all other members of the genus by a combination of the following: head 3.0-3.4 (3.1); greatest body depth 3.6-4.7 (4.1); least body depth 8.8-11.0 00.0); origin of pectoral fin to anus 2.7-3.1 (2.9), all in SL. Dorsal process of premaxilla 1.1-1.70.4 in eye. Midlateral scale count 28-30 (29.1); transverse scale count 5.5-6.5 (6.0); vertebral count 30-32 (31.4). Position of anus in relation to tip of pelvic fin from 0.5 scales in front to 2 scales behind tip of pelvic fin. Differs osteologically from all other Craterocephalus species by a combination of the following: shape of anterior medial process of maxilla; lack of interdorsal pterygiophores (but shared with some other members of C. eyresii group); minute anterior process usually present on cleithrum; dorsal process of cleithrum also present; basisphenoid short and thick. Differs genetically from Craterocephalus marianae at the following loci: ADA, CK, FDP, GPI-l,MPI, PGM and from C. munroi at CK, FDP, GLDH, GPI-l, MPI, PGM. Unique at GPI-lf (Ref. 26703).
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Trophic Strategy

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Lives in clear flowing streams where it is common along the vegetated margin. Feeds mostly on aquatic insects and their larvae, microcrustaceans and algae.
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Drina Sta. Iglesia
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Biology

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Lives in clear flowing streams where it is common along the vegetated margin. Generally in shallow water over sandy or gravelly substrates. A shoal-forming species. Capable of multiple spawnings between September and January (with peak activity early in the season). It has reproduced in captivity (Ref. 44894). Feeds mostly on aquatic insects and their larvae, micro-crustaceans, algae and fish eggs (Ref. 44894).
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Craterocephalus marjoriae

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Craterocephalus marjoriae, commonly known as Marjorie's hardyhead or silverstreak hardyhead, is a species of fish in the family Atherinidae that is native to eastern Australia, namely central Queensland to northeastern New South Wales.[1] Here it inhabits clear flowing streams and it is common among the vegetation in their margins. It prefers shallow water over streambeds consisting of sand or gravel. It forms shoals. They spawn on multiple occasions between September and January, although this peaks earlier in the season.[2] They form pairs for spawning, the eggs being deposited on aquatic vegetation to which they adhere. The eggs are large measuring 1.15-1.25 mm in diameter and have adhesive filaments. The eggs hatch after around a week and the larvae measure about 5.7 mm standard length.[3] Their diet consist mostly of aquatic insects and their larvae, small crustaceans, algae and fish eggs.[2] This species was described by Gilbert P. Whitley in 1948 with the type locality given as Eidsvold on the Burnett River in Queensland.[4] Whitley may have named this species in honour of his sister Marjorie Frewer.[5]

References

  1. ^ Pusey, Brad; Kennard, Mark; Arthington, Angela, eds. (2004). Freshwater Fishes of North-Eastern Australia. Collingwood, Victoria: Csiro Publishing. pp. 171–79. ISBN 9780643098954.
  2. ^ a b Froese, Rainer and Pauly, Daniel, eds. (2019). "Craterocephalus marjoriae" in FishBase. April 2019 version.
  3. ^ Vanessa J. Thompson. "Craterocephalus marjoriae". Fishes of Australia. Museums Victoria. Retrieved 22 July 2019.
  4. ^ Eschmeyer, William N.; Fricke, Ron & van der Laan, Richard (eds.). "Craterocephalus marjoriae". Catalog of Fishes. California Academy of Sciences. Retrieved 22 July 2019.
  5. ^ Christopher Scharpf & Kenneth J. Lazara (1 January 2019). "Order ATHERINIFORMES: Families ATHERINOPSIDAE, ATHERINIDAE and ATHERIONIDAE". The ETYFish Project Fish Name Etymology Database. Christopher Scharpf and Kenneth J. Lazara. Retrieved 22 July 2019.

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Craterocephalus marjoriae: Brief Summary

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Craterocephalus marjoriae, commonly known as Marjorie's hardyhead or silverstreak hardyhead, is a species of fish in the family Atherinidae that is native to eastern Australia, namely central Queensland to northeastern New South Wales. Here it inhabits clear flowing streams and it is common among the vegetation in their margins. It prefers shallow water over streambeds consisting of sand or gravel. It forms shoals. They spawn on multiple occasions between September and January, although this peaks earlier in the season. They form pairs for spawning, the eggs being deposited on aquatic vegetation to which they adhere. The eggs are large measuring 1.15-1.25 mm in diameter and have adhesive filaments. The eggs hatch after around a week and the larvae measure about 5.7 mm standard length. Their diet consist mostly of aquatic insects and their larvae, small crustaceans, algae and fish eggs. This species was described by Gilbert P. Whitley in 1948 with the type locality given as Eidsvold on the Burnett River in Queensland. Whitley may have named this species in honour of his sister Marjorie Frewer.

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