Role and efficacy of marine protected areas for the South African rock lobster, Jasus lalandii

2005 ◽  
Vol 56 (6) ◽  
pp. 913 ◽  
Author(s):  
Stephen Mayfield ◽  
George M. Branch ◽  
Andrew C. Cockcroft
Keyword(s):  
Protected Areas ◽  
South African ◽  
Harmful Algal Blooms ◽  
Algal Blooms ◽  
Egg Production ◽  
Marine Reserve ◽  
Rock Lobster ◽  
The South ◽  
Order Of Magnitude ◽  
St Helena

Protected areas for the South African rock lobster, Jasus lalandii, were sampled by using divers, traps and ringnets at sites within and adjacent to four protected areas (St Helena Bay, Saldanha Bay and Table Bay rock lobster sanctuaries and the Betty’s Bay marine reserve), over two years. Virtually no rock lobsters were found in St Helena Bay sanctuary, probably because of periodic harmful algal blooms. Abundance was greater in Saldanha Bay sanctuary than in adjacent fished areas, but only once in two years. Sizes were, however, larger in this sanctuary than the fished areas. By an order of magnitude, fewer and smaller rock lobsters were caught within the Table Bay sanctuary than in adjacent areas. Only at Betty’s Bay were rock lobster sizes and abundance consistently greater inside than outside the reserve. Fecundity was similar among sites, with females in protected areas contributing no more to egg production than would be expected by the proportional area occupied by protected areas. Rock lobsters do benefit from protection in Betty’s Bay reserve, but the west coast sanctuaries appear poorly located and seemingly contain large areas of unsuitable substrate. They clearly need relocation to be effective.

scholarly journals Spiders and Scorpions (Arachnida: Araneae, Scorpiones) of the Nylsvley Nature Reserve, South Africa

Koedoe ◽  
2009 ◽  
Vol 51 (1) ◽  
Author(s):  
Ansie S. Dippenaar-Schoeman ◽  
Annette Van den Berg ◽  
Lorenzo Prendini
Keyword(s):  
South Africa ◽  
Protected Areas ◽  
South African ◽  
National Survey ◽  
Nature Reserve ◽  
New Records ◽  
The South ◽  
Spider Species

Among other activities, the South African National Survey of Arachnida (SANSA) aims to survey the biodiversity of arachnids in protected areas of South Africa. The study presented here documents the diversity of spiders and scorpions collected from the Nylsvley Nature Reserve (NNR), South Africa over a 30-year period. The spider fauna of NNR contains 175 species (7.5% of the total recorded in South Africa), in 131 genera and 37 families. Thomisidae is the most diverse spider family in the reserve, with 33 species (18.9% of the total), followed by Salticidae, with 20 species (11.4%), and Araneidae, with 18 species (10.3%). The majority of species (125) are wandering spiders (71.4%), whereas 50 species (28.6%) build webs. Wandering grounddwelling spiders comprise 52 species, whereas 73 wandering species have been collected from the vegetation. A total of 158 species are new records for the reserve and Oxyopes tuberculatus Lessert, 1915 is newly recorded for South Africa. Six spider species may be new to science. The scorpion fauna of NNR comprises five species (5% of the total recorded in South Africa) in three genera and two families. Buthidae are more diverse in the reserve, with four species and two genera represented. The scorpion fauna of the reserve includes two fossorial and three epigeic species, representing five ecomorphotypes: semi-zpsammophilous, pelophilous, lithophilous, corticolous and lapidicolous. Five additional scorpion species may be recorded if the reserve is sampled more intensively using appropriate techniques.

Improving the catch efficiency of the West Coast rock lobster, Jasus lalandii

2000 ◽  
Vol 51 (6) ◽  
pp. 613 ◽  
Author(s):  
D. Loewenthal ◽  
S. Mayfield ◽  
G. M. Branch
Keyword(s):  
Weight Loss ◽  
South African ◽  
West Coast ◽  
Capture Rate ◽  
Catch Rate ◽  
Rock Lobster ◽  
The South ◽  
The West ◽  
The Relationship

The South African commercial rock-lobster industry employs an average soak time of 22 h for traps. Experiments were undertaken to test (1) the rate of bait loss with soak time and the effect that protection of the bait has on bait loss, (2) the relationship between catch rate (numbers per trap) and soak time for traps with either protected or unprotected bait, and (3) the effect of two bait types (whole maasbanker and hake heads) on the catch of rock lobsters. There were substantial losses of unprotected bait within 6 h; substantially less weight loss was observed from protected bait even after a 48-h soak time. The numbers of rock lobsters caught in traps with unprotected bait were low relative to the capture rate with protected bait. The highest capture rate occurred after 6 h for unprotected bait and 6–12 h for protected bait. There was no significant effect of bait type (maasbanker v. hake heads) on the number or size of rock lobsters. To optimize catch efficiency, the commercial industry should use protected bait and soak times as short as 6–12 h.

The South African Fisheries: A Preliminary Survey of Historical Sources

2001 ◽  
pp. 167-180
Author(s):  
Lance van Sittert
Keyword(s):  
South African ◽  
West Coast ◽  
Marine Resources ◽  
Historical Records ◽  
Preliminary Survey ◽  
Rock Lobster ◽  
The South ◽  
Historical Sources ◽  
The West

Lance van Sittert explores the historical records concerning the exploitation of marine resources along the West Coast of Africa, using them to provide evidence of the commerical importance of the West Coast over the East or South. The date demonstrates a boom-bust cycle along the West Coast, pertaining to whales, snoek, guano, rock lobster, hake, and pilchard.

scholarly journals South African National Survey of Arachnida (SANSA): Solifugae (sun-spiders) of the national parks and reserves of South Africa (Arachnida, Solifugae)

Koedoe ◽  
2006 ◽  
Vol 49 (2) ◽  
Author(s):  
A.S. Dippenaar-Schoeman ◽  
A.X. González Reyes
Keyword(s):  
South Africa ◽  
Protected Areas ◽  
South African ◽  
National Parks ◽  
National Survey ◽  
The South

As part of the South African National Survey of Arachnida (SANSA) inventories are underway to determine the diversity of the South African Arachnida fauna (Dippenaar- Schoeman & Craemer 2000). Several SANSA projects are in progress, including inventories of the arachnid faunas of protected areas. One such project is an inventory of the Solifugae (sun spiders) from protected areas. Meaningful conservation can not take place if the species involved are not known.

Nutrition

1929 ◽  
Vol 2 (1) ◽  
pp. 35-40
Keyword(s):  
South African ◽  
Egg Production ◽  
Fish Meal ◽  
Feeding Experiment ◽  
The South ◽  
Department Of Agriculture ◽  
Feeding Experiments ◽  
Meat Meal ◽  
Meal Feeding

Fish-meal and Meatmeal. The South African Poultry Magazine, Nov. '28. Department of Agriculture. Interesting feeding experiments with poultry.On the poultry section of the Potcheftroom School of Agriculture two exceptionally interesting and instructive experiments are being conducted. The values of meat-meal and fish-meal as foodstuffs for poultry are being determined. The meat-meal feeding experiment has been in progress since November, 1927, and the egg-production for the last five months is as follows:20 per cent, meat-meal fed, 295 eggs laid; 12½ per cent. meat-meal fed, 235 eggs laid; 5 per cent. meat-meal fed, 197 eggs laid; 0 p. cent. meat-meal fed, 175 eggs laid. During the period November, 1927, to August, 1928, the egg production was 1,144, 1,030, 936 and 954 respectively. It is, however, only during the winter months that the suitability of a foodstuff actually becomes apparent. The figures show clearly that meat-meal is an essential constituent of the ration during this period. Of course, all the fowls received sufficient quantities of the respective rations. This experiment, and the information obtained in other places, indicate that the best balanced ration is that which ontains about 12½ per cent, meat-meal.

Unprecedented toxic algal blooms impact on Tasmanian seafood industry

2016 ◽  
Vol 37 (3) ◽  
pp. 143 ◽  
Author(s):  
Gustaaf Hallegraeff ◽  
Christopher Bolch
Keyword(s):  
Harmful Algal Blooms ◽  
Algal Blooms ◽  
East Coast ◽  
Economic Losses ◽  
Human Society ◽  
Rock Lobster ◽  
Negative Effects ◽  
Risk Area ◽  
Seafood Industry ◽  
Hab Species

While most microscopic algae provide food for filter-feeding shellfish and larvae of crustaceans and finfish, other so-called Harmful Algal Blooms (HABs) can have negative effects, causing severe economic losses to aquaculture, fisheries and tourism. Of greatest concern to human society are blooms of toxic HAB species that cause illness and death of fish, seabirds and mammals via toxins transferred through the food web. Unprecedented Alexandrium (Dinophyceae) blooms along the East Coast of Tasmania in 2012 and 2015, a previously low biotoxin risk area, led to major impacts on the local oyster, mussel, scallop and rock lobster industries. Four human hospitalisations also occurred from eating wild shellfish.

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