By Ray Ingle (auth.)
Fishermen, marine aquarists, biologists learning beach and coastal waters, and people interested by buying and selling shellfish or even restaurateurs are conscious of the nice range of crustaceans inhabiting the seas round the British Isles, Northern Europe and the Mediterranean. Crayfishes, Lobsters and Crabs of Europe will permit the reader to spot forty two crustacean species of industrial value present in those areas in the course of coastal explorations, fishing journeys, displayed in public aquaria or on hand in eating places, together with chosen freshwater crayfishes, deep-sea species and a few imported species.
The e-book additionally comprises sections at the gross inner and exterior constitution of those Crustacea, their lifestyles histories, category and nomenclature. The ebook is of curiosity to scholars of marine biology and researchers in fisheries science.
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Additional info for Crayfishes, Lobsters and Crabs of Europe: An Illustrated Guide to common and traded species
A. Dorsal aspect ofwhole crayfish. B. A. leptodactylus salinus, left cheliped. C. First and second pleopods of male from right side of body and from ventral aspect. For explanation of annotations see opposite page. 40 Freshwater crayfishes FURTHER READING Anon. A guide to identifying Freshwater Crayfish in Britain and Ireland. National Rivers Authority (Infonnation leaflet). F. (1990) Crayfish culture. Laboratory Leaflet 62. Ministry ofAgriculture Fisheries and Food. Directorate of Fisheries Research.
The majority of females spawn in early autumn and incubate their eggs for approximately eight months. Each hatches as a minute spiny larvae [zoea] (fig. 2, A) that moult through at least three planktonic stages before developing into a lobster-shaped [megalopa] fonn (fig. 2, B) that adopts a benthic life style on the sea bed. At the following moult it is transfonned into a juvenile lobsterling. Fig. 2 Development ofa nephropid lobster. A. Planktonic first stage larva [zoea], total length 7 mm. B.
For explanation of annotations see opposite page. 36 Freshwater crayfishes Astacus astacus astacus (Linnaeus,1758) Fig. 5, PI. 2. COMMON SYNONYMS: Astacus fluviati/is; Potamobius fluviati/is; Astacus (Astacus) astacus. Astacus nobi/is~ DERIVATION: astakos (Gr)-a kind oflobster or crayfish. VERNACULAR NAMES: Noble Crayfish (UK)~ Ferskvannskreps (Nw)~ Edelkrebs (Gr)~ Ecrevisse a Pieds Rouges (Fr); Gambaro (It); Tatli su Istakozu (Tr). DISTINCTIVE FEATURES: rostrum (rs, fig. A) not distinctly converging distally, apex long, median ridge (mr, fig.