Embryonic, larval and juvenile development of the roughskin sculpin, Trachidermus fasciatus (Scorpaeniformes

Cottidae)

Naohiko Takeshita, Norio Onikura, Seiichi Matsui, Seirô Kimura

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

Embryonic, larval and juvenile development of the catadromous roughskin sculpin, Trachidermus fasciatus, were described using eggs spawned in an aquarium. The eggs, measuring 1.98-2.21 mm in diameter, were light reddish-yellow and had many oil globules, 0.05-0.18 mm in diameter. Hatching occurred 30 days after spawning at 2.3-11.3°C. The newly-hatched larvae, measuring 6.9-7.3 mm BL, had a single oil globule, 9-10+25-26=34-36 myomeres and 6 or 7 large stellate melanophores dorsally along the gut. The yolk was almost resorbed, number of pectoral-fin rays attained 16-17, and two parietal, one nuchal and four preopercular spines were formed, 5 days after hatching, at 8.2-8.4 mm BL. The oil globule disappeared, and one supracleithral spine was formed, 11 days after hatching, at 8.9-9.5 mm BL. Notochord flexion began 15 days after hatching, at 9.7-10.3 mm BL. A posttemporal spine was formed 20 days after hatching, at 10.7-10.9 mm BL. The first dorsal fin spines (VII-VIII), second dorsal fin and anal fin rays (18-19, 16-18, respectively) appeared 23 days after hatching, at 12.0-13.7 mm BL. The pelvic fin spine and rays (I, 4) were formed and black bands on the head and sides of the body began to develop 27 days after hatching, at 13.8-15.8 mm BL. Newly-hatched larvae swam just below the surface in the aquaria. Preflexion larvae (8.9-9.5 mm BL), in which the oil globule had disappeared, swam in the middle layer, while juveniles (13.8-15.8 mm BL) began swimming on the bottom of the aquaria. Swimming behavior observed in the aquaria suggested that the fish started to change to a demersal existence at the juvenile stage.

Original languageEnglish
Pages (from-to)257-266
Number of pages10
JournalIchthyological Research
Volume44
Issue number3
Publication statusPublished - Aug 15 1997

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Scorpaeniformes
Cottidae
hatching
spine (bones)
fins
aquarium
aquariums
oils
oil
larva
larvae
egg
aquarium fish
swimming behavior
Trachidermus fasciatus
spawning
digestive system
fish

All Science Journal Classification (ASJC) codes

  • Animal Science and Zoology

Cite this

Embryonic, larval and juvenile development of the roughskin sculpin, Trachidermus fasciatus (Scorpaeniformes : Cottidae). / Takeshita, Naohiko; Onikura, Norio; Matsui, Seiichi; Kimura, Seirô.

In: Ichthyological Research, Vol. 44, No. 3, 15.08.1997, p. 257-266.

Research output: Contribution to journalArticle

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