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Alosa algeriensis Regan, 1916

Description

Dorsal spines (total): 0; Dorsal soft rays (total): 18 - 22; Anal spines: 0; Anal soft rays: 20 - 25; Vertebrae: 53 - 57. Diagnosis: This species is distinguished from other species of Alosa entering freshwater in the Mediterranean basin by: dorsal profile convex; 40-60 thin gill rakers in individuals larger than 200 mm standard length, with 25 to 38 on its lower part; and no teeth on palatine (Ref. 10538, 59043).

Common Names

  • North African shad , English , Algeria
  • Alžeeria aloosa , Estonian , Estonia
  • Sábalo rifeño , Spanish , Morocco

    • Taxonomic Hierarchy

    Kingdom: Animalia

    Phylum: Chordata

    Class: Teleostei

    Order: Clupeiformes

    Family: Alosidae

    Genus: Alosa

    Species: Alosa algeriensis Regan, 1916

    Climate Zone

  • Subtropical

    • Location

  • Africa: along North African coasts of Mediterranean Sea from the Rif Peninsula in Morocco to northern Tunisia (Ref. 10538), also entering permanent rivers in Algeria and Tunisia (Ref. 10538, 59043). A landlocked population exists in Lake Ichkeul, Tunisia (Ref. 59043). In Europe, it is restricted to western Sardinia, Italy (Ref. 59043).

    • Biology

    This species undertakes anadromous breeding migrations from the sea, where it spends most of its life, into the freshwater sections of rivers; it can also live permanently in brackish water (Ref. 10538). Males migrate upriver at 3-4 years, females at 4-5 years; it starts entering rivers when temperatures reach 14-18°C, mainly in May, and spawning commences when temperature rises above 20°C in May and June (Ref. 59043). The spawners return downstream immediately after spawning, but many die after spawning; most juveniles migrate to river mouth in first summer and remain at sea until they mature (Ref. 10538, 59043). Spawning occurs close to estuaries in fresh and brackish water (Ref. 59043). In the marine and brackish water habitats, this shad consumes small fishes, such as species of Engraulis, Sardina, and Sardinella, and small benthic crustaceans, mainly isopods and amphipods (Ref. 10538).

    Habitat

    freshwater