Jasus Lalandii
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Jasus Lalandii

Jasus lalandii
JasusLalandii.JPG
Scientific classification
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J. lalandii
Binomial name
Jasus lalandii
Synonyms

Jasus lalandii (also called 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 be the French astronomer Jérôme Lalande.[2]

Distribution

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]

Description

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.[4]

Ecology

A group of rock lobsters on a reef

Generally found on rocky reefs, where it prefers the shelter of crevices. Often seen in groups with antennae protruding from the shelter. Swims backwards in emergencies using the tail, but generally crawls around on the reef.


It's predators include seals, sharks and large fish. Susceptible to low oxygen levels in the water which may cause mass strandings [4].

Feeding

Jasus lalandii is a generalist predator and scavenger of mussels, sea urchins, abalone, barnacles, among other thing [5]. 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 [5]. In it's choice for sea snails it selects prey below the critical size as attacking these prey is likely to involve the least risk [6]. 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 [6]. This indicates that overall J. lalandii optimizes the energetic returns from feeding while minimizing the risk involved.

Fishery

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.[7] 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).[8]

See also

References

  1. ^ Cockcroft, A.; Butler, M.; MacDiarmid, A. & Wahle, R. (2011). "Jasus lalandii". IUCN Red List of Threatened Species. 2011: e.T170072A6725661. doi:10.2305/IUCN.UK.2011-1.RLTS.T170072A6725661.en.
  2. ^ Hans G. Hanssen. "Biographical Etymology of Marine Organism Names". Tjärnö Marine Biological Laboratory, Göteborg University & Stockholm University. Retrieved 2007.
  3. ^ a b Lipke Holthuis (1991). "Jasus lalandii (Cape rock lobster)". Marine Lobsters of the World. Food and Agriculture Organization. pp. 99-100. ISBN 92-5-103027-8.
  4. ^ a b Jones, Georgina. A field guide to the marine animals of the Cape Peninsula. SURG, Cape Town, 2008. ISBN 978-0-620-41639-9
  5. ^ a b Van Zyl, R. F.; Mayfield, S.; Branch, G. M. (June 2003). "Aquarium experiments comparing the feeding behaviour of rock lobster Jasus lalandii on abalone and sea urchins on the west coast of South Africa". African Journal of Marine Science. 25 (1): 377-382. doi:10.2989/18142320309504024.
  6. ^ a b van Zyl, R.F.; Mayfield, S.; Pulfrich, A.; Griffiths, C.L. (1998). "Predation by West Coast rock lobsters (Jasus lalandii) on two species of winkle (Oxystele sinensis and Turbo cidaris)". South African Journal of Zoology. 33 (4): 203-209. doi:10.1080/02541858.1998.11448473.
  7. ^ "Information on fisheries management in the Republic of South Africa". Food and Agriculture Organization. Retrieved 2007.
  8. ^ "Regulations for fishing of West Coast rock lobster (Jasus lalandii)". South African Department of Environmental Affairs and Tourism. Archived from the original on August 19, 2007. Retrieved 2007.

  This article uses material from the Wikipedia page available here. It is released under the Creative Commons Attribution-Share-Alike License 3.0.

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