The slender rainbow sardine (Dussumieria elopsoides) is a small, subtropical, salt water fish of the Indian Ocean and the South China Sea which was first described by Bleeker in 1849. Dussumieria hasselti and Dussumieria productissima are synonyms for this same fish. It is a round herring of the family Clupeidae.
Until the 1980s in the eastern Mediterranean slender rainbow sardines were frequently confused with the rainbow sardine (Dussumieria acuta). Wangratana (1980) demonstrated the differences between Dussumieria acuta and Dussumieria elopsoides, while Whitehead (1985) and Randall (1996) showed that Dussumieria elopsoides does occur in the Mediterranean.
The slender rainbow sardine is primarily differentiated from the rainbow sardine, because the slender rainbow sardines do not have tiny radiating striae on the posterior part of their scales. There is some indication that the slender rainbow sardine may tend to have more vertebra than the rainbow sardine.
The tail fin is heavily forked. The scales are very delicate and are easily detached. Like other sardines it has no lateral line, and no scales on the head.
The slender rainbow sardine is primarily differentiated from the rainbow sardine, because the slender rainbow sardines do not have tiny radiating striae on the posterior part of their scales. There is some indication that the slender rainbow sardine may tend to have more vertebra than the rainbow sardine.
The native range of the slender rainbow sardine is in the tropical and subtropical portions of the Indian Ocean and the South China Sea. It is found from East Asia in the northeast, through Southeast Asia to northern Australia in the south, and through South Asia to eastern Africa, the Persian Gulf, and the Red Sea in the west. It is also found off the coasts of islands deep in the Pacific, such as Tonga and the Solomon Islands. Dussumieria elopsoides entered the Mediterranean Sea via the Suez Canal in the middle of the last century. Recorded first off Israel in 1949, it is now quite common in the south-eastern Mediterranean from Egypt to Turkey.
The slender rainbow sardine swims in schools and while pelagic it is generally found near shores. It feeds on zooplankton, mainly crustacean and smaller fish. The slender rainbow sardine spawns mainly in spring. Its eggs, and when they hatch the larvae, drift passively until they metamorphose into free-swimming fish.
