Ecological effects of trawling fisheries on the eastern Australian continental shelf: a modelling study

2013 ◽  
Vol 64 (11) ◽  
pp. 1068 ◽  
Author(s):  
Marie Savina ◽  
Robyn E Forrest ◽  
Elizabeth A Fulton ◽  
Scott A Condie

The New South Wales Offshore Trawl Fishery began to expand in 1976, following a large exploratory trawl survey carried out on the fishing grounds of the upper continental slope. This survey was repeated 20 years later with the same vessel and using similar protocols. Comparison of the survey results suggested that the overall fish biomass in the survey area had substantially decreased after 20 years. We have implemented an ecosystem model using the Atlantis framework to (1) emulate the evolution of the shelf ecosystems from 1976 to 1996 and (2) explore the effects of alternative fishing pressures on those ecosystems. We have been able to emulate the observed decline of most of the commercial groups of fish species in the Offshore Trawl Fishery, including sharks, and our results confirmed that fishing pressure was the most important cause of these observed changes. Fourteen fishing scenarios highlight the competing nature of some of the ecosystem-based sustainable fishing objectives.

1996 ◽  
Vol 47 (2) ◽  
pp. 331 ◽  
Author(s):  
AG Miskiewicz ◽  
BD Bruce ◽  
P Dixon

The distribution of tailor (Pomatomus saltatrix) larvae is described on the basis of the results of four plankton surveys undertaken in northern and central New South Wales (NSW) coastal waters. These comprised a single survey during May 1989 along the northern NSW coast and multiple surveys in January, March and May 1983 between Sydney and Brisbane. Pomatomus saltatrix larvae occurred throughout the survey period, with the highest abundances on the northern NSW coast. Most larvae were caught in mid and outer continental shelf waters at water temperatures of ≥22�C. The only known spawning locality for P. saltatrix is in the vicinity of Fraser Island in southern Queensland from August to October. The occurrence of larvae along the NSW coast from January to May indicates that the spawning season of P. saltatrix is more extensive than previously reported and that spawning occurs along the east coast of Australia in localities other than Fraser Island. Further surveys of larvae in southern Queensland and northern NSW waters, especially from August to December, are required to determine if P. saltatrix has one extended or two discrete spawning seasons along the eastern coast of Australia.


1983 ◽  
Vol 34 (2) ◽  
pp. 253 ◽  
Author(s):  
DC Smith

Catch curves were analysed to estimate the annual total mortality of jackass morwong landed at the port of Eden between July 1976 and June 1979. The annual total mortality of females was lower in 1978-1979 than in the previous 2 years, reflecting the expansion of the trawl fishery in New South Wales to include previously unexploited deepwater grounds. Males were fully recruited to the commercially exploited population at an earlier age than females. It is suggested that the increased mortality in older males is due to an increase in natural mortality.


Zootaxa ◽  
2007 ◽  
Vol 1441 (1) ◽  
pp. 1-19
Author(s):  
DAVID T. DRUMM

Two new species of kalliapseudid tanaidacea from Australia, Kalliapseudes longisetosus and Kalliapseudes messingi, are described from marine waters off Sydney, New South Wales and the Northwest continental shelf, respectively. Kalliapseudes longisetosus is distinguished from the other congeners by the presence of a single, very long simple seta on the anterior corners of the pereonites (about as long as the first pereonite) and several very long simple setae on the basis of the second and third pereopods (about as long as the basis). This new species is the second member of the genus to be reported from New South Wales. Kalliapseudes messingi is distinguished by having two small setae medially on the dactylus of pereopods 4 and 5, by the female having a tuft of sensory setae subterminally on the dactylus of pereopod 6, and by having three plumose setae on both the cheliped and pereopod 1 exopodite and is the first member of the genus to be reported from the Northwest continental shelf of Australia. Both species have a needle-like tip on the dactylus of the second and third pereopods. A table giving the distribution data for the species of Kalliapseudes and a key to the genera and species of Kalliapseudidae now known from Australia are presented.


2020 ◽  
Vol 32 (3) ◽  
pp. 636-655
Author(s):  
Lif Lund Jacobsen

In 1914, the New South Wales (NSW) Government decided to alter its fisheries policy, with the development of an offshore trawling industry supplanting support for inshore fishing as its key development objective. Accordingly, between 1915 and 1923 the NSW Government operated a commercial trawling industry designed to fish previously unexploited fish stocks on the state’s continental shelf. The State Trawling Industry (STI) was designed to meet a mix of social and economic policy goals, with the NSW Government controlling all parts of the production line from catching to selling produce. This article examines the business structure of the enterprise to reveal the reasons for its economic failure. It argues that government entrepreneurship created a new consumer market and unintentionally paved the way for the rise of a modern private trawling industry.


Author(s):  
Hannah Briony Thorne ◽  
Belinda Goodwin ◽  
Erika Langham ◽  
Matthew Rockloff ◽  
Judy Rose

The aim of the current study was to examine the different EGM environmental preferences of recreational compared to problem gamblers in Australia. Semi-structured interviews were conducted with 59 EGM gamblers recruited from EGM venues in Queensland and New South Wales, Australia. Interview data were organised using a thematic analysis into 42 major environmental features that gamblers identified as being of importance in choosing where and what to play. The frequency with which certain environmental characteristics were mentioned was analysed quantitatively, along with demographic information and PGSI status. Results showed that the most common reason for selecting the gambling platform was social, and in-venue gambling was largely but not exclusively preferred for this reason. The most frequently mentioned reason for selecting the provider was based on being close to home and enjoying the service at the venue. Finally, games were frequently selected based on features such as free spins, minimum bet sizes, graphics and in-game sounds. The survey results identified that persons experiencing gambling problems more frequently mentioned the availability of a number of game choices and the perceived potential for winning as important aspects in choosing an EGM environment. This study provides some preliminary evidence on what features of the EGM environment are important to players, and most conducive to safer gambling environments. The findings from this study will inform policy initiatives for player protection through the development of safer EGM gambling environments.L’objectif de la présente étude était d’examiner les différentes préférences quant à l’environnement d’un site d’appareils de loterie vidéo entre les joueurs qui font un usage récréatif de ces appareils et les joueurs à problèmes en Australie. Des entrevues semi-dirigées ont été menées auprès de 59 utilisateurs d’appareils de loterie vidéo recrutés dans divers lieux où de tels appareils sont accessibles dans le Queensland et en Nouvelle-Galles-du-Sud (Australie). Une analyse thématique des données des entrevues a permis d’organiser les données en 42 grandes caractéristiques environnementales ayant de l’importance pour les joueurs dans le choix d’un jeu et de l’endroit où jouer. La fréquence dans laquelle certaines caractéristiques environnementales ont été mentionnées a fait l’objet d’une analyse quantitative, de même que les données démographiques et l’indice de gravité du jeu problématique des joueurs. Les résultats indiquent que les raisons les plus communes pour le choix d’une plateforme de jeux étaient d’ordre social, et que, par conséquent, la préférence était en grande partie, mais non exclusivement, accordée aux espaces de jeu situés dans des lieux publics. La raison la plus fréquemment mentionnée pour le choix d’un lieu de jeu était la courte distance de la résidence et les services offerts par l’établissement. Enfin, le choix des jeux reposait généralement sur des caractéristiques comme l’offre de parties gratuites, le montant minimal des mises et les effets visuels et sonores du jeu. Les résultats de l’enquête indiquent que les personnes aux prises avec des problèmes de jeu mentionnaient plus fréquemment, parmi les caractéristiques importantes pour le choix d’un site d’appareils de loterie vidéo, l’éventail des jeux offerts et la perception d’une plus grande possibilité de gagner. Cette étude fournit de manière préliminaire des données probantes sur les caractéristiques environnementales des sites d’appareils de loterie vidéo qui sont importantes pour les joueurs et sur celles qui sont les plus propices à la création d’environnements de jeu sécuritaires. Les conclusions de l’étude éclaireront l’élaboration d’initiatives stratégiques visant à protéger les joueurs par l’établissement de sites d’appareils de loterie vidéo sécuritaires. 


1984 ◽  
Vol 35 (6) ◽  
pp. 611 ◽  
Author(s):  
XH Fang ◽  
FM Boland ◽  
GR Cresswell

A triangular current-meter mooring array and concurrent research vessel observations were used to observe high-frequency current variations for 9 days in April 1981 on the continental shelf off Sydney, N.S.W. Internal waves propagated onshore at 0.6 m s-1 with an energy flux of the order of 103 J m-1 s-1. One soliton-like event was recorded and it also propagated onshore at 0.6 m s-1.


Sign in / Sign up

Export Citation Format

Share Document