Westernport Bay: anatomy of an Australian estuary

1976 ◽  
Vol 10 (13) ◽  
pp. 1216-1221 ◽  
Author(s):  
Maurice A. Shapiro ◽  
A. Dunbavin. Butcher
Keyword(s):  
Australian Estuary

Life cycle of the western school prawn, Metapenaeus dalli Racek, in a Western Australian estuary

1986 ◽  
Vol 37 (1) ◽  
pp. 95 ◽  
Author(s):  
IC Potter ◽  
JW Penn ◽  
KS Brooker
Keyword(s):  
Life Cycle ◽  
Western Australia ◽  
Sexual Maturity ◽  
Second Year Of Life ◽  
Second Year ◽  
Australian Estuary ◽  
Western Australian

The absence of marine records for M. dalli below latitude 31�S., together with data on gonadal stages and spermatophore deposition on females of this species in the Swan estuary, provide very strong indications that the western school prawn typically breeds in estuarine environments in south-western Australia. The 0 + recruits, which first appeared in samples in February, remained in the estuary during the following months and by November had reached a size suitable for exploitation. At this time they were approaching sexual maturity and were starting to move from the shallows to the deeper waters of the estuary where they remained for their second year of life. In contrast to Australian Penaeus species, M. dalli mates during the intermoult period when the shell is hard rather than immediately after moulting.

Diets of piscivorous fishes in a tropical Australian estuary, with special reference to predation on penaeid prawns

1990 ◽  
Vol 105 (3) ◽  
pp. 363-374 ◽  
Author(s):  
J. P. Salini ◽  
S. J. M. Blaber ◽  
D. T. Brewer
Keyword(s):  
Special Reference ◽  
Australian Estuary

Influence of environmental variables on the fish fauna of the deeper waters of a large Australian estuary

1987 ◽  
Vol 94 (4) ◽  
pp. 631-641 ◽  
Author(s):  
N. R. Loneragan ◽  
I. C. Potter ◽  
R. C. J. Lenanton ◽  
N. Caputi
Keyword(s):  
Environmental Variables ◽  
Fish Fauna ◽  
Australian Estuary

scholarly journals DYNAMICS OF A LONGITUDINALLY STRATIFIED ESTUARY

1976 ◽  
Vol 1 (15) ◽  
pp. 177 ◽  
Author(s):  
Jorg Imberger
Keyword(s):  
Density Gradient ◽  
Fresh Water ◽  
Salinity Gradient ◽  
Vertical Mixing ◽  
Three Dimensional ◽  
First Order ◽  
Vertical Density ◽  
Stratified Estuary ◽  
Set Up ◽  
Australian Estuary

Introduction. A partially stratified estuary is defined as one which possesses a quite definite longitudinal salinity gradient from the mouth to the head of the estuary, but only a very weak vertical or transverse salinity structure. For an estuary to exhibit such characteristics it must possess a source of fresh water near the head of the estuary, sufficient vertical mixing to overcome the potential energy associated with such a fresh water inflow and be very much longer than its width to reduce transverse variations. If the estuary is very shallow (a few meters) then wind generated turbulence is often sufficient to eliminate most or all the vertical structure. Deeper, or very sheltered, estuaries require additional strong tidal shears to break up the vertical density gradients. However, in both cases the mixing is usually not sufficient to completely homogenize the estuary longitudinally and it is found that these estuaries display a near linear salinity gradient along the principle axis of the estuary throughout most of the spring and summer months. Such a density gradient drives a gravitational circulation within the estuary which leads to a net transport of salt from the sea mouth to the head of the estuary. Two dimensional theories (see for instance Rat tray and Mitsuda (1974)) have been established, but In general these greatly underestimate the longitudinal transport found in such estuaries and three dimensional circulation effects must be considered. Fischer (1972) was the first to recognise this fact and he carried out a first order analysis which pointed to a greatly increased longitudinal dispersion. However, Fischer (1972) carried out his analysis only to first order, not explaining how the transverse pressure field, set up by the first order velocity field convecting the longitudinal density gradient, is balanced. It is the purpose of this paper to give a rigorous foundation to Fischer's (1972) hypothesis that it is the transverse variations in velocity which yield the greatest contribution to any longitudinal transport of the density or any passive pollutant. Furthermore, the presented theory is applied to a local Western Australian estuary which is ideally suited for such a comparison complying strictly to the assumptions of the theory.

Abundance, distribution and age structure offish populations in a Western Australian estuary

2009 ◽  
Vol 200 (1) ◽  
pp. 21-50 ◽  
Author(s):  
I. C. Potter ◽  
N. R. Loneragan ◽  
R. C. J. Lenanton ◽  
P. J. Chrystal ◽  
C. J. Grant
Keyword(s):  
Age Structure ◽  
Abundance Distribution ◽  
Australian Estuary ◽  
Western Australian
Sign in / Sign up

Export Citation Format

Share Document