Scientific Name:

Nemipterus randalli

Κοινό όνομα:

Randall's threadfin bream

Ταξινομική Ομάδα:

Ψάρια

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Πληροφορίες

Διαγνωστικά χαρακτηριστικά

The body is ellipsoid and slightly compressed. It is up to 30 cm in length, commonly 5–20 cm, although in the Mediterranean they seem smaller. The upper part of the body is pinkish, becoming silvery on the ventral surface. There are 3 or 4 pale yellow stripes along the sides, and a golden dot on the pectoral base. The dorsal fin is pale bluish, with the upper margin edged in red, with closely packed yellow markings on the lower three-quarters of the fin. The anal fin is pale bluish with a narrow yellow medial band. The eye is salmon pink. The tail fin has a red margin and is forked, with a characteristic long filament extending from the upper edge of the upper lobe, sometimes missing.

It has a single, continuous dorsal fin with 10 spines and 9 soft rays, and a slightly pointed anal fin (3 spines, 7 soft rays). The pectoral fin (15–17 soft rays) is long and pointed.

Αναγνώριση / Ενδιαίτημα

Randall's threadfin bream is a benthic species, occurring on open sandy and muddy sea beds down to depths of 20–200 m; in the Mediterranean it is mainly found at 30–80 m.

Περιγραφή παρόμοιου είδους

The long filament that extends from the upper edge of the upper lobe of the tail fin distinguishes this species from others. If this tail filament is broken, medium-sized Randall's threadfin breams look like some Sparidae species (Pagellus spp.). (Pagellus) species, however, have a first dorsal fin with 11–13 spines (compared with 10 spines in N. randalli), and molar teeth in the jaw.

Nemipterus randalli Similar Species (0010) EL — **Pagellus acarne**

Nemipterus randalli Similar Species (0020) EL — **Pagellus erythrinus**

Nemipterus randalli Similar Species (0030) EL — **Pagellus acarne**

Ιστορία και τρόπος εισαγωγής

Randall's threadfin bream is widespread in the western Indian Ocean, including the Red Sea and the East African Coast. In the Mediterranean it was first recorded off Israel in 2005, as Nemipterus japonicus; it has subsequently been recorded from Lebanon, Egypt, and from Mersin Bay to Antalya in Turkey. Nemipterus randalli appears to have an established population in the eastern Mediterranean that extends at least from Haifa Bay, Israel, to the Cevlik coast of Iskenderun Bay, Turkey.

Οικολογικές επιπτώσεις

Randall's threadfin bream feeds principally on small benthic invertebrates (polychaetes, crustaceans, cephalopods and molluscs) and small fishes. Its rapid spread and increasing abundance can reduce the biodiversity of benthic decapod crustaceans in particular, as well as native fish communities feeding on these species.

Οικονομικές επιπτώσεις

In the Western Indian Ocean, Randall’s threadfin bream is an important target species for local fisheries (small commercial trawlers). In the Mediterranean, it is caught in large numbers by trawling and to a lesser extent by trammel nets and long lines. It may well form the basis of an important future fishery in some Mediterranean areas.

Διαχειριστικά μέτρα

These include a) early eradication of new populations by MPA technicians through spear fishing, and b) maintenance of healthy and abundant assemblages of top predators to encourage natural control through predation.

Επιπλέον πληροφορίες

http://www.ciesm.org/atlas/Nemipterusrandalli.php

Bariche, M., 2012. Field identification guide to the living marine resources of the Eastern and Southern Mediterranean. FAO Species Identification Guide for Fishery Purposes. Rome, FAO. 610 pp.

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