رنكة أطلسية

Slender fish with a round belly. Scutes without prominent keel; 12 to 16 post-pelvic scutes (Ref. 188). No median notch in upper jaw; operculum without radiating bony striae; the posterior border of its gill opening is evenly rounded. It is blue to greenish-blue dorsally, becoming silvery ventrally. No distinctive dark spots on the body or fins (Ref. 188).

Anisakis Disease. Parasitic infestations (protozoa, worms, etc.)

Internal Fungal Infection (Ichthyophonus sp.). Fungal diseases

The herring matures between 2-9 years (Refs. 35388, 82767, 89571). Herring populations are known to use traditional spawning grounds, many of which are along shallow coastal areas (15-40 m depth) or on offshore banks down to 200 m (Refs. 6684, 89572). Spawning usually occurs on gravel or rock bottoms, with the exception of Baltic populations which show a preference for shallow (less than 10 m depth) seaweed beds (Refs. 89520, 89572). Each population spawns only once a year over a relatively short time period (Ref. 89573). At least one population is spawning in any one month of the year, each having a different spawning time and place. The herring is a demersal spawner that releases a ribbon of sticky eggs that sink to the sea bed (Ref. 89574) and adhere to the substrate. The eggs released by a spawning population may be several layers thick which may deprive eggs in the bottom layers of oxygen, causing egg mortality (Ref. 89563). Although higher fecundities were reported earlier (e.g. Ref. 74523), fecundity now ranges from 10,000-60,000 eggs (Ref. 89571). Hatching may take up to 3 weeks, depending on temperature (Ref. 89571). Larvae are pelagic and drift with the current. Note: it is impossible to summarize briefly the wide range of spawning strategies of Atlantic herring; the best reviews are those of Svetovidov (Refs. 4608, 4609) for the Eastern Atlantic Ocean and Hildebrand (Ref. 4607) for the Western Atlantic Ocean.

Oceanodromous. Migrating within oceans typically between spawning and different feeding areas, as tunas do. Migrations should be cyclical and predictable and cover more than 100 km.

Dorsal spines (total): 0; Dorsal soft rays (total): 13 - 21; Analspines: 0; Analsoft rays: 12 - 23; Vertebrae: 51 - 60

Visual size-selective plankton feeder (Ref. 89567) Has the ability to switch between particulate- and filter-feeding (Ref. 4809). Adult feed on planktonic crustaceans, mollusc larvae, arrow worms, ctenophores, small fish (incl. eggs and larvae) (Ref. 188). Preyed upon by fish, birds, and marine mammals (Ref. 89563). Parasites found are protozoans, myxosporidians, trematodes, cestodes, nematodes and copepods (Refs. 5951, 37032). Herring biomass has shown inverse correlation with the biomass of sprat, a competitor for planktonic food (Refs. 82765; 82766).

Herring schools move between spawning and wintering grounds in coastal areas and feeding grounds in open water by following migration patterns learned from earlier year classes (Ref. 88171). Juveniles (up to 2 years) shoal close inshore, while adults are found more offshore (Ref. 6683). Adults spend the day in deeper water, but rise to shallower water at night (Ref. 89562). Light is an important factor in controlling their vertical distribution. A facultative zooplanktivorous filter-feeder, i.e., it can switch to filter-feeding if the food density and particle size are appropriate (Ref. 28664). Feed mainly on copepods finding food by visual sense. Herring schools often attract predators such as fish, birds, and marine mammals (Ref. 89563). Schooling, silvery sides, excellent hearing (capable of detecting frequencies between 30-4,000 Hz , Refs. 89391, 89564, 89566), and very fast escape response act as anti-predator devices (Ref. 28664). The most important races in the East Atlantic are the winter-spawning Norwegian and Icelandic herring, the autumn spawning Icelandic and North Sea herring and the Baltic Sea herring. Utilized fresh, dried or salted, smoked, canned and frozen; can be fried, broiled, microwaved and baked (Ref. 9988).

fisheries: highly commercial; gamefish: yes; price category: low; price reliability: reliable: based on ex-vessel price for this species