Thalassoma janseni   (Bleeker,  1856) (Fish)
Organism information awaits expert curation
Taxonomy
Kingdom:Animalia
Phylum:Chordata
Class: Actinopterygii
Order:Perciformes
Family:Labridae

Image copyrights: The Nature Conservation and Aquatic Sciences Service

Description
Size: 18.6 cm.

Color: In preserved specimens the head is dark brown or bluish grey above, creamy white below, the demarcation between the colors rather sharp and situated in a line from posterior border of eye to opercular flap. The dark color of the upper part of the head is continued to below second dorsal spine, the membrane between first and second dorsal spine also dark, much darker and forming a black blotch in young specimens. Inferiorly the dark color ends on the level with that of the head, forming one large saddle over head and anterior part of body. It is however intersected by a light area, bordering the hind border of the gill opening. This saddle followed by five similar saddles, diminishing in breadth posteriorly, the last very faint on caudal peduncle. The inter spaces smaller than the saddles and of the same creamy white color as the underside of the body. In young specimens the saddles are continued on the basal part of the dorsal, which is otherwise creamy white with a narrow white outer border. In older specimens the dark color spreads upwards to this border. The second to fifth saddles fuse more in old specimens, and descend also to the ventral side, where they spread on the anal, the posterior part of which and also the tip of the anterior part being often dark. In other specimens the anal is creamy white as in the young, with only a smaller or larger dark patch at the extremity of the fin. In still other specimens (the variety b of Bleeker) all the bands fuse, the upper part of head and body are bark, with some light spots on and below dorsal, as rests of the light inter spaces. In the posterior part of the body the color descends on the base of the anal, which fin is also dark posteriorly. Pectorals hyaline, often dusky in their anterior and superior part. Ventrals whitish. Caudal dusky, in young specimens with a dark spot in the middle of its base, spreading and less distinct in older specimens, where the outer rays are dark.

Height 3.3-3.9, 4.2-4.7 in length with caudal. head 3-3.6, 3.7-4.5 in length with caudal. Height of head 1.2 in its length. Eye 4.3-6, 1.5-2.1 in snout and 1.1-1.5 in convex inter orbital space. Mouth nearly horizontal. Corner of mouth not reaching to below anterior nostril. Lips thick, plated. Teeth moderate, in a single crowded series in both jaws. Two moderate canines in upper and lower jaw. Head naked, with exception of a small patch of about 4 scales, arranged in 2 rows, immediately above opercle. About 6 scales before dorsal. Dorsal spines short and slender, the first scarcely as long as diameter of eye, the last almost half diameter of eye longer. Membranes between the spines not or scarcely incised. Soft dorsal higher than spinous part, pointed behind. Origin of anal below last dorsal spine. First anal spine minute, hidden in the skin or absent. Last anal spine longest, slightly longer than last dorsal spine. Soft anal similar to soft dorsal. Base of dorsal and anal with a low scaly sheath. Pectorals half diameter of snout shorter than head. Ventrals with the first ray more or less produced, equal to post orbital part of head. Caudal semi-lunar, the outer rays prolonged into long filaments in adult specimens.


Remarks: Values in above description denote proportions.


Synonym (s)
Julis (Julis) Jansenii Bleeker, 1856
Julis janseni Bleeker, 1862
Julis jansenii Gunther, 1909
Julis jansenii Day, 1877
Thalassoma janseni Snyder, 1912
Julis (Janseni var. b) M. Weber, 1913
Thaiassoma jansenii Fowler, 1928
Thalassoma jansenii Fowler and Bean, 1928
Julis jansenii Day, 1878
Thalassoma jansenii de Beaufort, 1940

Common Name (s)
• Galihikkae
• Nhola
Economic Importance and Threats

Ecology

Biogeography


• Lakshadweep, Minicoy Atoll (Lat: 8) (Long: 71) INDIA
• Andaman and Nicobar Islands, Andamans INDIA
• Lakshadweep, Agatti INDIA
• Lakshadweep, Amini INDIA
• Lakshadweep, Andrott INDIA
• Lakshadweep, Kadamatt INDIA
• Lakshadweep, Kalpeni INDIA
• Lakshadweep, Kavaratti INDIA
• Lakshadweep, Minicoy INDIA
• Lakshadweep INDIA
• INDIA
• SRI LANKA
• Lakshadweep, Agatti INDIA (Record: 11/1993-01/1997)
• Andaman and Nicobar Islands INDIA

Literature Source(s)
  • Wafar, MVM (2003) Checklists of reef fauna Available at - http://www.reefindia.org/
  • Pillai, CSG; Gopakumar, G and Mohan, M (1991) Ichthyofauna of the intertidal reef flats of Minicoy atoll, Lakshadweep An analysis of its structure, relative abundance and food Journal of the Marine Biological Association of India The marine Biological Association of India 34 74-83 Available at - NIO, RC Kochi
  • Society for the Management of European Biodiversity Data (2009) World Register of Marine Species (WoRMS) Available at - http://www.marinespecies.org
  • Beaufort, LF (1940) The fishes of the Indo-Australian Archipelago A. J. Reprints agency, Karol Bagh, New Delhi 8 508 pp Available at - NIO, Goa
  • Jones, S and Kumaran, M (1980) Fishes of the Laccadive Archipelago The Nature Conservation and Aquatic Sciences Service, Trivandrum, Kerala 760 pp Available at - NIO, Goa
  • Murty, VS (2002) Marine ornamental fish resources of Lakshadweep CMFRI Special Publication CMFRI 72 1-134 Available at - http://eprints.cmfri.org.in/3536/1/Special_Publication_No_72.pdf
  • Ghosh, S; Ganeshamurthy, R; Balamurugan, J and Kumar, TTA (2011) Reef fishing- An off season amusement at Lakshadweep Fishing chimes 31(1) 128-130 Available at - NIO, Goa
  • Talwar, PK (1990) Fishes of Andaman and Nicobar Islands: A synoptic survey Journal of the Andaman Science Association Andaman Science Association, Port Blair 6(2) 71-102 Available at - NIO,Goa

Page last updated on:2011-08-09

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