Distribution, relative abundance and size composition of the threatened serranid Epinephelus daemelii in New South Wales, Australia

2013 ◽  
Vol 83 (2) ◽  
pp. 378-395 ◽  
Author(s):  
D. Harasti ◽  
H. Malcolm
Keyword(s):  
Relative Abundance ◽  
New South ◽  
New South Wales ◽  
Size Composition ◽  
South Wales

scholarly journals Comparative Angler Catches of Australian Bass (Macquaria novemaculeata) in Three Major River Systems in New South Wales, Australia

2005 ◽  
Vol 18 (2) ◽  
Author(s):  
B. VAN DER WALT ◽  
R. A. FARAGHER ◽  
J. HARRIS
Keyword(s):  
Time Series Data ◽  
New South ◽  
New South Wales ◽  
River System ◽  
Size Composition ◽  
Series Data ◽  
Severe Drought ◽  
Catch Per Unit Effort ◽  
South Wales ◽  
Catch Rates

A joint program between New South Wales Fisheries and three fishing clubs was initiated in 1988 with the aim of collecting standardised catch and effort data during biannual fishing competitions on three major rivers in New South Wales. This paper examines the data to determine trends in the catch of the target species, Australian bass (Macquaria novemaculeata) and to evaluate whether the data can be used to assess Australian bass populations over time. Distinct trends in Australian bass mean length in each river system were evident but catch rates were more variable. Median catch per unit effort was similar (mostly between 0.5 and 1.5 Australian bass·h-1 ) in the Nepean and Williams Rivers although catch rates in the Manning River were nearly always zero. There was an increasing trend in the mean length of Australian bass in all three rivers, possibly representing a recovery in fish populations following severe drought from 1979 to 1983. Low or zero catch rates were continually recorded in the Manning River and size composition data indicated a lack of recruitment through most of the study period. The standardised format of the data collection program provided qualitative and reliable time series data allowing the determination of long-term trends in the population structure of Australian bass which can be used for monitoring and management purposes.

Distribution and Relative Abundance of Feral Goats in the Rangelands of Eastern Australia.

1993 ◽  
Vol 15 (2) ◽  
pp. 331 ◽  
Author(s):  
C Southwell ◽  
K Weaver ◽  
N Sheppard ◽  
P Morris
Keyword(s):  
Relative Abundance ◽  
New South ◽  
New South Wales ◽  
Aerial Survey ◽  
South Wales ◽  
Eastern Australia ◽  
Goat Population ◽  
Arid Rangelands ◽  
Feral Goat ◽  
Semi Arid

An aerial survey of 966,000 km2 of the arid/semi-arid rangelands of Queensland and New South Wales in the winter of 1992 indicated a minimum feral goat population of almost 1 million animals (density 0.97�0.12/km2). Observed density (f standard error) was higher in New South Wales (1.51�0.23/km2) than in Queensland (0.47�0.09/km2).

The New South Wales Trawlfishery: Review of Past Course and Examination of Present Condition

1955 ◽  
Vol 6 (2) ◽  
pp. 165 ◽  
Author(s):  
TW Houston
Keyword(s):  
New South ◽  
New South Wales ◽  
Size Composition ◽  
Fishing Effort ◽  
Present Condition ◽  
Catch Per Unit Effort ◽  
Nineteen Thirties ◽  
Unit Effort ◽  
South Wales ◽  
Post War

The past course of the New South Wales mixed trawlfishery is reviewed mainly on the basis of the available catch and fishing effort statistics. The size composition of tiger flathead landings from 1946-47 to 1953-54, and the age composition for certain post-war years, are analysed in conjunction with catch per unit effort data. The results suggest that 1943-44, 1944-45, 1947-48, and 1948-49 were relatively poor brood years, and 1945-46 and 1946-47 relatively good. The fluctuations in availability of tiger flathead (Neoplatycephalus macrodon (Ogilby) ) are accounted for after making certain valid assumptions. It is considered probable that the unexpectedly low catches of tiger flathead in the immediate post-war years were due to inefficiency of the few steam trawlers then working, and that Danish seiners were unable to exploit fully the available V+ and higher age-group fish. An examination of the present situation indicates that the New South Wales stock of tiger flathead is at a low level and is likely to reach even lower levels in the future if fishing intensity remains as high as in 1953-54. An improvement of the existing catch per unit effort would be expected if fishing intensity was reduced to the level of the middle nineteen-thirties (i.e. approx. 3500 trawler-tons) . Other regulative measures would need to be introduced to bring about an improvement in the annual catch of tiger flathead. These measures should aim at ensuring a more favourable weight-length relation.

An assessment of pedoturbation by two species of mound-building ants, Camponotus intrepidus (Kirby) and Iridomyrmex purpureus (F. Smith)

Soil Research ◽  
1985 ◽  
Vol 23 (1) ◽  
pp. 95 ◽  
Author(s):  
JA Cowan ◽  
GS Humphreys ◽  
PB Mitchell ◽  
CL Murphy
Keyword(s):  
Impact Energy ◽  
Organic Material ◽  
Size Structure ◽  
New South ◽  
New South Wales ◽  
Size Composition ◽  
Soil Mixing ◽  
South Wales ◽  
Erosion Protection ◽  
Raindrop Impact

Details of the size, structure and occurrence of Carnponotus intrepidus nests and the size, composition and source of the mound cover on Iridomyrmex purpureus nests are reported from several areas of eastern New South Wales. Both species are common, and construct large mounds of mixed topsoil and subsoil with surface covers, which appear to protect the mound from rainsplash erosion. Camponotus thatches the mound with charcoal, leaves and twigs; Iridomyrmex covers the mound in granules of inorganic or organic material that are sufficiently large to absorb most raindrop impact energy. This material is collected from the surface and carried 10-15 m to the nest. Rainsplash erosion protection is probably a factor contributing to nest longevity, which may be as much as 100 years for Iridomyrmex. It is concluded that, despite the impressive size of the nests and the selective use of materials, neither species is very significant in terms of soil mixing when compared with the smaller, more common ant Aphaenogaster longiceps.

Studies of the Ground-Dwelling Mammals of Eucalypt Forests in South-Eastern New South Wales: the Effect of Habitat Variables on Distribution and Abundance.

1995 ◽  
Vol 22 (3) ◽  
pp. 271 ◽  
Author(s):  
PC Catling ◽  
RJ Burt
Keyword(s):  
Relative Abundance ◽  
New South ◽  
New South Wales ◽  
Basal Area ◽  
Vegetation Communities ◽  
South Eastern ◽  
South Wales ◽  
Eucalypt Forests ◽  
Abundance And Distribution ◽  
Habitat Variables

The distribution and abundance was studied of ground-dwelling mammals in 13 areas within 500 000 ha of eucalypt (Eucalyptus spp.) forest in south-eastern New South Wales. Data are presented on the relative abundance and distribution of mammals in relation to the complexity of the habitat of the vegetation communities, basal area of the trees, and indices of nutrients in the foliage of the trees.

Effects of moon phase and soak time on catches of Jasus (Sagmariasus) verreauxi recruits on collectors

2003 ◽  
Vol 54 (7) ◽  
pp. 847 ◽  
Author(s):  
S. S. Montgomery ◽  
J. R. Craig
Keyword(s):  
Relative Abundance ◽  
Early Stage ◽  
New South ◽  
New South Wales ◽  
Moon Phase ◽  
The Moon ◽  
Lunar Periodicity ◽  
South Wales ◽  
Phases Of The Moon ◽  
Sagmariasus Verreauxi

The hypothesis tested in this study was that catches of recruits (sum of pueruli to early-stage juveniles of the same year class) of Jasus (Sagmariasus) verreauxi on seaweed-type collectors were affected by lunar periodicity and by the soak time of the collectors. Mean numbers of recruits did not differ between phases of the moon, but significantly more recruits were caught on collectors soaked for four weeks than on those soaked for three or two weeks, which in turn were greater than on those soaked for one week. On the basis of these results, it was recommended that collectors should be soaked for four weeks. This information was used in developing a uniform and optimal methodology for full surveys to monitor the relative abundance of recruits of J. verreauxi along the coast of New South Wales.

Distribution, population structure and biological aspects of Squalus spp. (Chondrichthyes:Squaliformes) from New South Wales and adjacent Australian waters

2005 ◽  
Vol 56 (4) ◽  
pp. 405 ◽  
Author(s):  
Ken J. Graham
Keyword(s):  
New South ◽  
New South Wales ◽  
Size Composition ◽  
Adult Size ◽  
Mixed Species ◽  
Trawl Fishery ◽  
South Wales ◽  
Female Data ◽  
Biological Aspects ◽  
Upper Slope

Four species of Squalus dogsharks, S. megalops, S. cf. mitsukurii, Squalus sp. B and Squalus sp. F inhabit shelf and upper-slope depths off New South Wales and adjacent Australian states. During fishery surveys between 1976 and 2001, distributional, size composition and reproductive data were collected for these species. Adult size classes dominated catches and, for S. megalops, heavily biased sex ratios were observed. Although no female data were available for the rarely caught Squalus sp. B, reproduction in the other three species was found to be continuous with no evidence of seasonality. Fecundity was 1–3 embryos for S. megalops, 1–5 for Squalus sp. F and 4–10 for S. cf. mitsukurii. All species are commercially exploited, contributing to the mixed species demersal trawl fishery off New South Wales. Stocks of some species are greatly depleted on the main trawling grounds, but the overall distributions of all species include large areas of lightly exploited habitat.

Life history of Mytilocypris henricae (Chapman) (Crustacea: Ostracoda) in Lake Bathurst, New South Wales

1985 ◽  
Vol 36 (6) ◽  
pp. 807 ◽  
Author(s):  
K Martens ◽  
P Deckker ◽  
TG Marples
Keyword(s):  
Life History ◽  
Larval Development ◽  
Relative Abundance ◽  
New South ◽  
New South Wales ◽  
Life Stages ◽  
Larval Stages ◽  
South Wales ◽  
Short Period ◽  
History Of

The life history of the halobiont ostracod M. henricae was studied over a 2.5-year period in Lake Bathurst, a slightly saline lake in New South Wales. Samples were collected monthly or bimonthly between March 1981 and May 1982 and weekly between August 1982 and June 1983. Relative abundance of all nine life stages (eight larval stages and one adult stage) in the samples was determined. Furthermore, in 10 selected monthly samples, sex-ratio, relative abundance of three female maturity stages and number of eggs in uteri of ovigerous females were monitored. Nearly all life stages were present throughout the year and M. henricae is thus a perennial form in Lake Bathurst. Relative abundance of life stages suggests that M. henricae produces three successive generations per year. The spring generation, hatched from eggs laid during winter, matures around November-December. Its larval development takes between 4 and 5 months. The summer generation matures after a larval development of 2.5 months; this short period is ascribed to more favourable temperatures. The autumn generation takes about 4 months to mature.

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