A surface plankton sampler for the larval stages of the western rock lobster.

1975 ◽  
Vol 26 (2) ◽  
pp. 275 ◽  
Author(s):  
BF Phillips ◽  
DW Rimmer
Keyword(s):  
Western Australia ◽  
Surface Waters ◽  
West Coast ◽  
Rock Lobster ◽  
The West ◽  
Small Boat ◽  
Larval Stages ◽  
Plankton Sampler

A net capable of catching the larval stages, including the puerulus of Panulirus longipes* (MilneEdwards) in the surface plankton is described. The sampler has a square 0.25 m2 mouth, an overall filtering length of 140 cm and a 10 cm diameter PVC cod-end bucket. Towed from a short boom from the side of a small boat or from a longer boom out from the side of a larger vessel, the sampler has a bridle attached to two opposite corners and a weight at the bottom corner so that in operation it presents a relatively unobstructed diamond shaped opening to the water. A total of 112 puerulus stage larvae were caught with this sampler (fitted with a 2.5 mm mesh net) during five nights of sampling within the reef at Seven Mile Beach. The greatest number of larvae were found to be present in the surface plankton prior to midnight. Modified versions of this sampler with either 2.5 mm or 1.0 mm mesh net have been successfully used to sample puerulus and phyllosoma stages of western rock lobster larvae in the surface waters off the west coast of Western Australia.

Breeding biology and movements of Australian sea-lions, Neophoca cinerea, off the west coasst of Western Australia

1992 ◽  
Vol 19 (4) ◽  
pp. 405 ◽  
Author(s):  
NJ Gales ◽  
AJ Cheal ◽  
GJ Pobar ◽  
P Williamson
Keyword(s):  
Breeding Season ◽  
Western Australia ◽  
West Coast ◽  
Metropolitan Region ◽  
Breeding Cycle ◽  
Sea Lion ◽  
The West ◽  
Breeding Sites ◽  
Sea Lions ◽  
Neophoca Cinerea

The Australian sea-lion, Neophoca cinerea, has a 17-18-month breeding cycle on islands off the west coast of Western Australia. Buller, North Fisherman and Beagle Is are the main pupping sites, with several very small colonies (n> 3) at the Abrolhos Is. The 4-5-month pupping seasons are synchronised at North Fisherman and Beagle Is, but the sea-lions from Buller I. breed one month later and those from the Abrolhos Is two months earlier. Pup production and pup mortality were highly variable between seasons over which observations were recorded: 129 pups were born at the main breeding sites in early 1988, the mortality in the first five months was 7.1%, whereas 181 pups were born in late 1989 of which 24.3% died. Pups remain in the vicinity of their natal islands for the first 4-5 months of life before leaving, perhaps on foraging trips, with their mothers. Most return to their natal island, although others haulout on islands up to 27 km away. Some male N. cinerea congregate in bachelor colonies on islands adjacent to the Perth metropolitan region during the non-breeding season and migrate up to 280 km north each breeding season. The status of the isolated, west-coast N. cinerea population is unknown. The current high level of human pressure on sea-lion terrestrial habitats and their food resources indicate a need for further monitoring of this species.

Jasus lalandii 'walkouts' or mass strandings in South Africa during the 1990s: an overview

2001 ◽  
Vol 52 (8) ◽  
pp. 1085 ◽  
Author(s):  
Andrew C. Cockcroft
Keyword(s):  
South Africa ◽  
West Coast ◽  
The Other ◽  
Fishing Industry ◽  
Low Oxygen ◽  
Rock Lobster ◽  
The West ◽  
Hypoxic Conditions ◽  
Oxygen Conditions ◽  
Mass Mortalities

Faunal mass mortalities are a sporadic, but not uncommon, feature of the West and South coasts of South Africa. Five mass mortalities of West Coast rock lobsterJasus lalandii, including three of the most severe ever recorded in South Africa, occurred in the 1990s and resulted in the stranding of about 2263 tonnes of lobster. The bulk (97%) of the loss occurred in the last three years of the decade. The five events occurred within an 80 km stretch of coastline that straddled two fishing zones and resulted from hypoxic conditions associated with highbiomass dinoflagellate blooms. In each case, the quantity of lobsters stranded was directly related to the extent or duration of low-oxygen conditions. Small females constituted the bulk of the lobster stranded in most events. The lobster fisheries in the affected fishing zones suffered severe impacts. Recovery in one zone appears to be extremely slow, whereas the other zone is more resilient. Not only would a continuation of the trend of increasing frequency and severity of lobster strandings devastate the rock-lobster fishing industry and the employment prospects of small fishing communities, but it could also seriously affect the ecology of the region.

New phallodrilines (Annelida: Clitellata: Tubificidae) from Western Australian groundwater

Zootaxa ◽  
2006 ◽  
Vol 1304 (1) ◽  
pp. 31 ◽  
Author(s):  
ADRIAN M. PINDER ◽  
S. M. EBERHARD ◽  
WILLIAM F. HUMPHREYS
Keyword(s):  
Southern Hemisphere ◽  
Western Australia ◽  
West Coast ◽  
The State ◽  
Karst Aquifers ◽  
The West ◽  
Western Australian

Four species of phallodriline tubificids (Clitellata: Tubificidae) from karst aquifers and caves along the west coast of the state of Western Australia are the first records of this subfamily from nonmarine waters in the southern hemisphere. Aktedrilus parvithecatus (Erséus 1978) and Pectinodrilus ningaloo n. sp. occur in anchialine groundwater of Cape Range, along with other taxa of marine affinity. Aktedrilus leeuwinensis n. sp. and Aktedrilus podeilema n. sp. occur in caves of the Leeuwin-Naturaliste Ridge and Perth Basin respectively and are the first taxa of marine lineage to have been collected from these systems.

Mitochondrial DNA variation of the west-coast rock lobster, Jasus lalandii: marked genetic diversity differences among sampling sites

2007 ◽  
Vol 58 (12) ◽  
pp. 1130 ◽  
Author(s):  
Conrad A. Matthee ◽  
Andrew C. Cockcroft ◽  
Keshni Gopal ◽  
Sophie von der Heyden
Keyword(s):  
Genetic Diversity ◽  
West Coast ◽  
Haplotype Network ◽  
Phylogeographic Structure ◽  
Rrna Gene ◽  
Rock Lobster ◽  
The West ◽  
Mt Dna ◽  
Dna Variation ◽  
Intensive Exploitation

Jasus lalandii (Milne-Edwards 1837), the west-coast rock lobster, occurs in the shallow, cool–temperate waters along the south and west coasts of southern Africa. This species has a long history of intensive exploitation, which has had a significant impact on population numbers in the past. To enhance our current understanding of lobster population structuring, genetic data from the mitochondrial (mt) DNA 16S rRNA gene was generated for 235 adult individuals collected at eight sampling sites. Most individuals (59.6%) share a common haplotype and 35 unique haplotypes were dispersed throughout the range. In total, 97.2% of the variation was found among individuals within sampling sites and 2.8% was among sites. Pairwise ΦST analyses revealed shallow, yet significant structure between Hout Bay individuals and some other sampling sites. The J. lalandii haplotype network indicates a starlike structure with no geographic signal; however, genetic diversity sharply decreases towards the edges of the species distribution. The general lack of phylogeographic structure among J. lalandii populations probably results from the absence of strong barriers to larval dispersal. Based on our mtDNA data there is no justification for the recognition of separate fishing stocks, but the high genetic diversities of populations at Hout Bay and Cape Hangklip, the latter currently outside of marine protected areas, makes these populations critical to conservation efforts.

scholarly journals Mitigation of incidental mortality of Australian sea lions in the west coast rock lobster fishery

2008 ◽  
Vol 5 ◽  
pp. 335-344 ◽  
Author(s):  
R Campbell ◽  
D Holley ◽  
D Christianopolous ◽  
N Caputi ◽  
NG Gales
Keyword(s):  
West Coast ◽  
Rock Lobster ◽  
The West ◽  
Sea Lions ◽  
Lobster Fishery ◽  
Incidental Mortality

A taxonomic revision of Pseudochitinopoma Zibrowius, 1969 (Annelida, Serpulidae) with description of two new species

Zootaxa ◽  
2012 ◽  
Vol 3507 (1) ◽  
pp. 57
Author(s):  
ELENA K. KUPRIYANOVA ◽  
HARRY A. TEN HOVE ◽  
EJIROH NISHI
Keyword(s):  
New Species ◽  
North America ◽  
Red Sea ◽  
Western Australia ◽  
West Coast ◽  
Taxonomic Revision ◽  
The West ◽  
Reproductive Patterns ◽  
Two New Species ◽  
Phylogenetic Affinities

This study is a revision of the poorly known genus Pseudochitinopoma Zibrowius, 1969 (Annelida, Serpulidae), erected for Hyalopomatopsis occidentalis Bush, 1905 from the West Coast of North America. Subsequently, an unnamed Pseudochitinopoma sp. nov. from the Seychelles (ten Hove 1994) (described herein as P. amirantensis sp. nov.) and P. pavimentata Nishi, 1999 were added to the genus. Ficopomatus capensis Day, 1961 is herein referred to Pseudochitinopoma, based on examination of the type material. Finally, Pseudochitinopoma beneliahuae sp. nov. was described from Western Australia and the Red Sea. Reproductive patterns and phylogenetic affinities of Pseudochitinopoma spp. are discussed.

An aerial survey for sperm whales off the coast of Western Australia 1963-1965.

1968 ◽  
Vol 19 (1) ◽  
pp. 31 ◽  
Author(s):  
JL Bannister
Keyword(s):  
Continental Slope ◽  
Western Australia ◽  
West Coast ◽  
Aerial Survey ◽  
South Coast ◽  
Sperm Whales ◽  
The South ◽  
The West ◽  
Offshore Area ◽  
Direction Of Movement

Objectives, methods, and results of a two-year aerial survey for sperm whales off the coast of Western Australia, 1963-65, are described. Data from commercial whaling operations have been included where appropriate. Sperm whales were found well off the west coast, but only in a narrow strip along the continental slope off the south coast. On both coasts, the main direction of movement was parallel to the coastline and towards Cape Leeuwin. Unexpectedly, whales off the west coast were heading mainly southwards throughout the year. Densities in the offshore area north of Perth were significantly higher than along the continental slope in the same region but similar to those along the continental slope from Perth to Cape Leeuwin. The situation was reversed on the south coast with whales being found, in high densities, only along the continental slope. Off the west coast, there were marked decreases in abundance in winter, with peaks in spring-early summer and autumn; no change in direction of movement could be related to the peaks. Average numbers calculated as present in the survey area at one time were: west coast, c. 1000 whales; south coast, c. 200 whales. South coast data indicate the passage of about 40 whales in one 24 hr period, very similar to results from whaling company aerial spotter data off Albany. The hypothesis of two separate populations of sperm whales off Western Australia is discussed and thought to be unlikely. A small amount of data on baleen whale sightings is recorded.

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.

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