Iso natalensis   Regan,  1919 (Fish)
Organism information awaits expert curation
Class: Actinopterygii

Image copyrights: SFSA

Size: 8.5 cm.

Color: Translucent in life, almost invisible in water. Whole side of body silvery, with virtually no dark pigmentation. Preserved specimens yellow brown, with silvery originating abruptly under pectoral and continuing to hypural, than tapering suddenly at caudal and widening out to form an irregular blotch. Belly, opercle and eye silvery, upper surface of head dark. Caudal fin dusky, other fins clear.

Body highly compressed, very deep at vertical through origin of pectoral fins, than tapering rapidly toward caudal peduncle. Head small and truncated posteriorly, very fine papillae, scarcely visible even under high magnification, present on upper surface of head, below the eyes and on lower jaw, teeth in jaws small, but well developed and curving backward into mouth, those on premaxilla extending outward onto free surface but diminishing in size; teeth also present on vomer and palatines (roof of mouth); mouth strongly oblique; premaxilla extending backward beyond vertical through anterior margin of orbit, its median process short (about as wide as long) and immobile, lateral process absent; dentary bone sloping upward and backward, its free surface more or less convex; gill rakers moderately long and well developed, longer than diameter of pupil, 10 to 12 on lower limb of first gill arch. Anus well behind tips of pelvic fins. First dorsal fin with 3 to 6 spines, second dorsal with 1 spine and 12 to 17 rays; anal fin with 1 spine and 21 to 28 rays; pectoral fins with 12 to 14 rays. Vertebral count 42 or 43. Body scales small, absent on predorsal and abdominal regions; midlateral scale count difficult, as scales very deciduous; reported as low as 60 and as high as 74 in literature.

Synonym (s)
Iso flosindicus Herre 1944

Common Name (s)
• Surf sardine (English)
Economic Importance and Threats
Importance:  Ecosystem balance
(Unlikely to be of any commercial importance but may be of great importance in food chain of larger surf fishes; also used as bait.)

Habitat:  Pelagic, Coastal


• East Coast INDIA
• Gujarat INDIA
• South Coast INDIA

Literature Source(s)
  • Society for the Management of European Biodiversity Data (2009) World Register of Marine Species (WoRMS) Available at -
  • Fischer, W and Bianchi, G (Eds.) (1984) FAO species identification sheets for fishery purposes. Western Indian Ocean (Fishing Area 51) FAO, Rome 3 Available at -
  • Froese, R and Pauly, D (2000) Fishbase 2000: Concepts, design and data sources ICLARM 344 pp Available at -

Page last updated on:2010-04-26

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