Distribution and growth of juvenile mulloway, Argyrosomus hololepidotus (Pisces: Sciaenidae), in the Hawkesbury River, south-eastern Australia

1993 ◽  
Vol 44 (3) ◽  
pp. 401 ◽  
Author(s):  
CA Gray ◽  
VC McDonall
Keyword(s):  
Fresh Water ◽  
Relative Abundance ◽  
Salinity Gradient ◽  
Late Summer ◽  
River Otter ◽  
South Eastern ◽  
Total Length ◽  
Eastern Australia ◽  
South Eastern Australia

The distribution, recruitment, relative abundance and growth of juvenile mulloway, Argyrosomus hololepidotus Lacepede, was investigated in the Hawkesbury River. Otter trawling was used monthly between July 1986 and March 1988 at 12 sites along a salinity gradient over 85 km of the estuary. The greatest numbers of juveniles were caught at sites in the mid section of the estuary (20-40 km from the mouth) where salinities were greatly reduced. No A. hololepidotus were caught at sites that were permanently fresh water and few were caught at the marine-dominated sites closest to the mouth of the estuary. The greatest numbers of juveniles were caught between March and September (autumn-winter) and the fewest between October and January (spring-summer). Juveniles with an estimated age of 2-6 months were caught between February and July (late summer-winter) each year at a size of 30-150 mm total length. Juveniles increased in length by 80-100 mm between March and October.

Biology of angel sharks (Squatina sp.) and sawsharks (Pristiophorus sp.) caught in south-eastern Australian trawl fisheries and the New South Wales shark-meshing (bather-protection) program

2017 ◽  
Vol 68 (2) ◽  
pp. 207 ◽  
Author(s):  
V. Raoult ◽  
V. Peddemors ◽  
J. E. Williamson
Keyword(s):  
New South ◽  
Growth Curves ◽  
Commercial Fishing ◽  
South Eastern ◽  
Total Length ◽  
South Wales ◽  
Large Numbers ◽  
Eastern Australia ◽  
Trawl Fisheries ◽  
South Eastern Australia

Two species of angel shark (Squatina australis, S. albipunctata) and two species of sawshark (Pristiophorus nudipinnis, P. cirratus) are frequently caught in south-eastern Australia. Little is known of the biology of these elasmobranchs, despite being caught as secondary target species in large numbers. The present study collected morphometric and reproductive data from sharks caught in shark-control nets, commercial fishing trawlers and research trawlers in south-eastern Australia. All four species had female-biased sexual size dimorphism, but growth curves between sexes did not differ. Male S. australis individuals were fully mature at ~800-mm total length, male P. nudipinnis at ~900mm, and male P. cirratus at ~800mm. Anterior pectoral margins could be used to determine total length in all species. No morphometric measurement could reliably separate Squatina spp. or Pristiophorus spp., although S. albipunctata over 1000-mm total length had larger eyes than did S. australis.

Meiofauna associated with mangroves in the Hunter River estuary and Fullerton Cove, south-eastern Australia

1985 ◽  
Vol 36 (1) ◽  
pp. 41 ◽  
Author(s):  
M Hodda ◽  
WL Nicholas
Keyword(s):  
Relative Abundance ◽  
River Estuary ◽  
Species Distributions ◽  
Total Density ◽  
Nematode Density ◽  
South Eastern ◽  
Algal Food ◽  
Factors Influencing ◽  
Eastern Australia ◽  
South Eastern Australia

The meiofauna from 14 sampling sites around the Hunter River estuary is described, and the factors influencing total density and relative abundance of nematodes and copepods and some species distributions are discussed. Elevation above low tide mark influenced nematode density, and salinity influenced copepod density and relative abundance. Both nematodes and copepods were most dense near the mud surface, and algal food and the depth of the reducing layer appear to be partially responsible for major differences in the density of these two taxa at different sites. Pollution also influenced the total density of both nematodes and copepods and also the relative abundance of oligochaetes: these relationships are discussed in the light of other, contradictory, reports.

Survey of freshwater red algae (Rhodophyta) of south-eastern Australia

1984 ◽  
Vol 35 (2) ◽  
pp. 213 ◽  
Author(s):  
TJ Entwisle ◽  
GT Kraft
Keyword(s):  
Fresh Water ◽  
Red Algae ◽  
Algal Flora ◽  
South Eastern ◽  
Marine Habitats ◽  
Eastern Australia ◽  
Red Algal ◽  
Freshwater Habitats ◽  
Australian Freshwater ◽  
South Eastern Australia

A survey of rivers and other freshwater habitats in south-eastern Australia has resulted in the description and illustration of 14 species and two forms of red algae. With the exception of the two species of Nothocladus, all the taxa appear to be widespread in warm to cool temperate regions of the world. Three of the species [Chroodactylon ornatum (C.Ag.) Basson, Caloglossa leprieurii (Mont.) J.Ag. and Bostrychia scorpioides (Gmel.) Montagne] occur in brackish and marine habitats, as well as in fresh water. Two species [Hildenbrandia rivularis (Liebm.) J.Ag. and Audouinella hermannii Roth] are members of fundamentally marine genera that have one or a few distinct freshwater representatives. The remaining taxa belong to the genus Compsopogon (Compsopogonaceae, Erythropeltidales) and the family Batrachospermaceae (Nemaliales), which have no marine representatives and probably evolved in fresh water. This latter group consists of Compsopogon coeruleus (Balb.) Montagne, Batrachosperrnum atrum (Huds.) Harvey, B. ectocarpum Sirodot, B. Helminthoideum (Sirod.) Mori (two forms), B. keratophytum Bory, B. virgato-decaisneanum Sirodot, Sirodotia suecica Kylin (two forms), Nothocladus nodosus Skuja and N. lindaueri Skuja. The survey has added six new records to the Australian freshwater red algal flora. Nothocladus nodosus Skuja and N. tasmanicus Skuja are synonymized; N. lindaueri Skuja, previously recorded only from New Zealand, was found to be widely distributed in Victoria. Taxonomic characters in the genus Batrachospermum from Australia, the largest and most difficult group of species encountered, are reviewed.

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