Reproduction of the turban shell Turbo torquatus Gmelin 1791 (Mollusca : Gastropoda), in New South Wales, Australia

2002 ◽  
Vol 53 (1) ◽  
pp. 85 ◽  
Author(s):  
D. W. Ward ◽  
A. R. Davis
Keyword(s):  
Reproductive Cycle ◽  
Developmental Stages ◽  
New South ◽  
Gonadosomatic Index ◽  
New South Wales ◽  
Gonad Development ◽  
Gonadal Development ◽  
Small Scale ◽  
Frequency Distributions ◽  
South Wales

The Sydney turban shell Turbo torquatus is the focus of a small-scale commercial fishery in New South Wales. Effective management requires knowledge of the reproductive biology, yet this is lacking for NSW waters. The reproductive cycle was investigated at three localities on the southern New South Wales coast. Samples of T. torquatus were collected monthly at Wollongong, Ulladulla and Eden from February 1996 until August or December 1997. The reproductive cycle was investigated by three methods: monthly determination of a gonadosomatic index, estimation of oocyte size-frequency distributions and classification of female gonads into developmental stages following histological sectioning. Males and females within a population underwent synchronous gonad development and spawning. Spawning events were often protracted over a period of several months with females in various stages of gonadal development. Two spawning events occurred each year, with a spawning event in autumn–winter and another in spring–summer. These events were asynchronous among the three localities, and partial spawning appeared to be a common occurrence. Owing to variation in the timing of spawning between populations separated by a distance as small as 15 km, seasonal closures to protect spawning stocks are unlikely to be effective.

The annual reproductive cycle of the sea urchin Centrostephanus rodgersii in New South Wales

2020 ◽  
pp. 734-734
Author(s):  
C. K. King ◽  
O. Høegh-Guldberg ◽  
M. Byrne
Keyword(s):  
Sea Urchin ◽  
Reproductive Cycle ◽  
New South ◽  
New South Wales ◽  
Annual Reproductive Cycle ◽  
South Wales

Feasibility analysis of a small-scale rainwater harvesting system for drinking water production at Werrington, New South Wales, Australia

2020 ◽  
Vol 270 ◽  
pp. 122437 ◽  
Author(s):  
Mohammad A. Alim ◽  
Ataur Rahman ◽  
Zhong Tao ◽  
Bijan Samali ◽  
Muhammad M. Khan ◽  
...  
Keyword(s):  
Drinking Water ◽  
Rainwater Harvesting ◽  
New South ◽  
New South Wales ◽  
Feasibility Analysis ◽  
Small Scale ◽  
Water Production ◽  
South Wales ◽  
Drinking Water Production

Small-scale patterns of distribution and size-structure of the intertidal littorinid Littorina unifasciata (Gastropoda: Littorinidae) in New South Wales

1994 ◽  
Vol 45 (4) ◽  
pp. 635 ◽  
Author(s):  
MG Chapman
Keyword(s):  
Size Structure ◽  
New South ◽  
Spatial Scales ◽  
New South Wales ◽  
Small Scale ◽  
Rock Surface ◽  
Strongly Correlated ◽  
Patterns Of Distribution ◽  
South Wales ◽  
Potential Factors

Within-shore and among-shore patterns of distribution, abundance and size structure of Littorina unifasciata Gray were identified on a number of shores in New South Wales. There was significant patchiness in distribution, abundance and size of L. unifasciata among patches of shore only a few metres apart, at different heights on the shore and from shore to shore. On a particular shore, the sizes of snails were strongly correlated with densities. In contrast, differences in densities at different heights from one shore to another were not correlated with mean size of snails. Density and size were each strongly correlated with the height on the shore at which snails were found. At any one height, differences in densities and size were also correlated with the distribution of particular microhabitat variables, such as the slope of the rock surface, the presence of pits and shallow pools and the presence of barnacles. Densities were also negatively correlated with densities of the large microalgae-grazing limpet Cellana tramoserica but were independent of other littorinids. A number of alternative models have been proposed to account for these patterns of distribution, abundance and size. Although processes that might account for these patterns were not investigated here, quantification of such patterns at a number of spatial scales is necessary before potential factors that might affect small-scale spatial variation in densities and sizes of L. unifasciata can be identified and investigated.

Variation in algal assemblages on wave-exposed rocky shores in New South Wales

1998 ◽  
Vol 49 (3) ◽  
pp. 241 ◽  
Author(s):  
A. J. Underwood ◽  
M. G. Chapman
Keyword(s):  
Large Scale ◽  
New South ◽  
New South Wales ◽  
Temporal Patterns ◽  
Explanatory Models ◽  
Small Scale ◽  
Rocky Shores ◽  
Spatial And Temporal Patterns ◽  
South Wales ◽  
Algal Assemblages

Data were collected in New South Wales from replicate sites on five wave-exposed shores separated by hundreds of kilometres at three-monthly intervals for four years, to examine large and small spatial and temporal patterns in low-shore algal assemblages. These data were used to test hypotheses from the models that algal assemblages show large-scale, predictable changes in structure or, alternatively, that variation from time to time is small-scale and differs from shore to shore or site to site on a shore. There was considerable variation at all scales examined — among replicate quadrats within sites, between sites on a shore and among shores. Similarly, assemblages differed from one sampling period to the next and changes in the assemblages over time periods of three months were as great as from year to year. These changes were interactive, with no two sites or shores showing similar temporal patterns. Thus, understanding diversity along a coast-line requires detailed understanding of local processes. Without adequate spatial and temporal replication in sampling designs and without explanatory models, the large and complex variability in intertidal assemblages at different scales cannot be documented and understood.

Environmental influences on histological changes in the reproductive cycle of four New South Wales sea urchins

Aquaculture ◽  
1978 ◽  
Vol 15 (1) ◽  
pp. 1-17 ◽  
Author(s):  
C. O'Connor ◽  
G. Riley ◽  
S. Lefebvre ◽  
D. Bloom
Keyword(s):  
Reproductive Cycle ◽  
Sea Urchins ◽  
New South ◽  
New South Wales ◽  
Environmental Influences ◽  
Histological Changes ◽  
South Wales

Reproductive cycle of two populations of Ophionereis schayeri (Ophiuroidea) in New South Wales

1995 ◽  
Vol 124 (1) ◽  
pp. 85-97 ◽  
Author(s):  
P. Selvakumaraswamy ◽  
M. Byrne
Keyword(s):  
Reproductive Cycle ◽  
New South ◽  
New South Wales ◽  
South Wales ◽  
Two Populations

Reproductive cycle of the fork-tailed catfish Arius graeffei Kner & Steindachner (Pisces : Ariidae) from the Clarence River, New South Wales

1985 ◽  
Vol 36 (1) ◽  
pp. 23 ◽  
Author(s):  
MA Rimmer
Keyword(s):  
Sex Ratio ◽  
Adult Female ◽  
Reproductive Cycle ◽  
Ovarian Development ◽  
New South ◽  
New South Wales ◽  
Dorsal Surface ◽  
Fish Length ◽  
Adult Males ◽  
South Wales

A. graeffei breeds annually from early November to early December when water temperatures reach 26°C and daylength averages 13.7 h. The bulk of ovarian development is restricted to the 2 months before spawning; the rate of oocyte development varies substantially between individuals. Diameters of mature oocytes range from 11.0 to 13.7 mm (mean 12.2 mm). Fecundity ranges from 40 to 122 and is linearly related to fish length and weight. The sex ratio of the population studied was 0.82 with a preponderance of males. The pelvic fins of adult female A. graeffei are longer and more rounded than those of adult males, and have a hook-like thickening (clasper) on the dorsal surface which develops seasonally in association with the reproductive cycle. Although marine populations of A. Graeffei appear to undertake extensive anadromous migrations associated with breeding, no such movements were observed in the fluviatile population studied.

'not Passing Through': Aboriginal Stakeholders in the Rangelands.

1994 ◽  
Vol 16 (2) ◽  
pp. 198
Author(s):  
N Williams ◽  
R Johnston
Keyword(s):  
Aboriginal People ◽  
New South ◽  
New South Wales ◽  
Small Scale ◽  
Ecological Knowledge ◽  
Multiple Use ◽  
South Wales ◽  
Multiple Use Management ◽  
And Control ◽  
North Western

Comparison of Aboriginal interests in rangelands in western New South Wales with those in north- western Northern Temtory and the Kimberley of Western Australia reveals little difference in their history, aspirations for land acquisition, or plans for multiple use management. Throughout Australia, Aboriginal people who are traditional owners of rangelands continue to live on or near the land they regard as traditionally theirs. This is true of the more closely settled rangelands as well as remote regions. In all the rangeland areas Aboriginal people now wish (and following the Mabo decision may more realistically expect to gain) some form of freehold title to at least some of their land. Aboriginal people whose traditional lands are located in western New South Wales have access to very little of their land but have maintained their connection to it. They have aspirations of obtaining access to and control over portions of it, with plans to manage it under a multiple use regime that would include small-scale sustainable pastoralism and agriculture, while living in dispersed family groups on the land. Aboriginal people's desire to retain access to their traditional land for non-economic reasons (spiritual, social, historical) is paramount. Should the Commonwealth Land Fund legislation be enacted, cultural imperatives as well as economic viability will need to be taken into account in the purchase of land. Planning for future management should incorporate traditional ecological knowledge and should involve Aboriginal traditional owners and their organisations, such as land councils and resource agencies, in local and regional planning.

Radiotherapy utilization in New South Wales from 1996 to 1998: Comment

2000 ◽  
Vol 44 (4) ◽  
pp. 483-484 ◽  
Author(s):  
JH Kearsley
Keyword(s):  
New South ◽  
New South Wales ◽  
South Wales
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