Search results
Results From The WOW.Com Content Network
Life Cycle of a Lobster. Female Cornish Lobsters with eggs attached are protected from harvest, but although a female lobster can carry as many as twenty thousand eggs under her carapace, only one ...
On this European lobster, the right claw (on the left side of the image) is the crusher and the left claw is the cutter.. Homarus gammarus is a large crustacean, with a body length up to 60 centimetres (24 in) and weighing up to 5–6 kilograms (11–13 lb), although the lobsters caught in lobster pots are usually 23–38 cm (9–15 in) long and weigh 0.7–2.2 kg (1.5–4.9 lb). [3]
They are then attached to the female's pleopods (swimmerets) using an adhesive, where they are cared for until they are ready to hatch. [41] The female cleans the eggs regularly and fans them with water to keep them oxygenated. [42]
In females, the first one or two pairs are missing, while the remaining pairs are uniramous, and have long setae, to which the eggs can be attached. [2] In males, the first two pairs are formed into gonopods , and are used to transfer the spermatophore to the female during mating; the first pair is often missing.
In many crustaceans, the fertilised eggs are released into the water column, while others have developed a number of mechanisms for holding on to the eggs until they are ready to hatch. Most decapods carry the eggs attached to the pleopods , while peracarids , notostracans , anostracans , and many isopods form a brood pouch from the carapace ...
European lobster or common lobster: may grow to a length of 60 cm (24 in) and a mass of 6 kilograms (13 lb), and bears a conspicuous pair of claws. [8] In life, the lobsters are most of the time blue, only becoming "lobster red" on cooking. [9] Homarus gammarus is a highly esteemed food, and is widely caught using lobster pots, [8]
A fertilised egg hatches into a nauplius: a one-eyed larva comprising a head and a telson with three pairs of limbs, lacking a thorax or abdomen. This undergoes six moults, passing through five instars, before transforming into the cyprid stage.
The adult female consists of three parts, the cephalothorax, a thorax bearing two large lateral expansions or wings, and the abdomen which is responsible for carrying two oval egg-sacs. The female Nicothoe astaci abdomen tip measures 1.2–1.3 millimetres (0.047–0.051 in), and each wing measures 4 mm (0.16 in) long.