Die Weskuskreef (Jasus lalandii) kom slegs aan die wes- en suidkus van Suid-Afrika voor. Dit staan ook bekend as die Kaapse Kreef. Sy kleur is oranje tot bruin en hy word 30 cm lank. Dit is 'n gesogte dis en kreefduik word streng gereguleer.
Die Weskuskreef (Jasus lalandii) kom slegs aan die wes- en suidkus van Suid-Afrika voor. Dit staan ook bekend as die Kaapse Kreef. Sy kleur is oranje tot bruin en hy word 30 cm lank. Dit is 'n gesogte dis en kreefduik word streng gereguleer.
Jasus lalandii, the Cape rock lobster or West Coast rock lobster, is a species of spiny lobster found off the coast of Southern Africa. It is not known whom the specific epithet lalandii commemorates, although it may the French naturalist and taxonomer Pierre Antoine Delalande.[2]
Jasus lalandii occurs in shallow waters from Cape Cross, Namibia to Algoa Bay, South Africa, straddling the Cape of Good Hope. It may be found as deep as 46 metres (150 ft) and is usually found on rocky bottoms.[3]
It is called crayfish (Afrikaans: kreef) and is often braaied, particularly in the coastal areas along its range, however overfishing has depleted stocks.[4]
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Larval forms
Orange to red-brown, with long antennae extending from the front of the head. Tail fan orange, blue and green. Thorax spiny. Eyes black and stalked.[5]
Generally found on rocky reefs, where it prefers the shelter of crevices. Often seen in groups with antennae protruding from the shelter. Swims backward in emergencies using the tail, but generally crawls around on the reef.
Its predators include seals, sharks and large fish. It is susceptible to low oxygen levels in the water which may cause mass strandings.[5]
Jasus lalandii is a generalist predator and scavenger of mussels, sea urchins, abalone, barnacles, among other thing.[6] When both abalone and sea urchins are available, rock lobsters preferentially feed on abalone. Which could be due to the higher calorific value of the sea urchins.[6] In its choice for sea snails it selects prey below the critical size as attacking these prey is likely to involve the least risk.[7] Small prey sea snails are opened by cracking the whole shell, while larger individuals are cracked sequentially by chipping parts of the shell until the muscular foot can be extracted.[7] This indicates that overall J. lalandii optimizes the energetic returns from feeding while minimizing the risk involved.
Jasus lalandii may grow up to a total length of 46 centimetres (18 in), with a carapace length of 18 cm (7.1 in). It is widely caught for its meat, with over 6,500 t being caught annually in lobster pots and hoop nets.[3] In order to prevent overfishing, individual fishing quotas are allocated by the Republic of South Africa to fishermen and companies, totalling 1,700 t.[8] There is also a closed season from 1 June to 15 November, a size limit of 80 mm (carapace length) and a ban on catching ovigerous females (females which are brooding their eggs).[9]
Media related to Jasus lalandii at Wikimedia CommonsJasus lalandii, the Cape rock lobster or West Coast rock lobster, is a species of spiny lobster found off the coast of Southern Africa. It is not known whom the specific epithet lalandii commemorates, although it may the French naturalist and taxonomer Pierre Antoine Delalande.
Jasus lalandii is een tienpotigensoort uit de familie van de Palinuridae.[2] De wetenschappelijke naam van de soort is voor het eerst geldig gepubliceerd in 1837 door H. Milne Edwards.
Bronnen, noten en/of referenties
Jasus lalandii (còn được gọi là tôm hùm đá Mũi Hảo Vọng hay tôm hùm đá West Coast) là một loài tôm hùm gai được tìm thấy ngoài khơi bờ biển Nam Phi. Người ta không biết nhà văn cụ thể lalandii tưởng niệm ai, mặc dù đó có thể là nhà thiên văn học người Pháp Jérôme Lalande.[2]
J. lalandii phân bố ở vùng nước nông từ Cape Cross, Namibia đến vịnh Algoa, Nam Phi, đi theo Mũi Hảo Vọng. Chúng có thể được tìm thấy sâu tới 46 mét (150 ft) và thường được tìm thấy trên đáy đá. [3]
Jasus lalandii (còn được gọi là tôm hùm đá Mũi Hảo Vọng hay tôm hùm đá West Coast) là một loài tôm hùm gai được tìm thấy ngoài khơi bờ biển Nam Phi. Người ta không biết nhà văn cụ thể lalandii tưởng niệm ai, mặc dù đó có thể là nhà thiên văn học người Pháp Jérôme Lalande.
