1,721,978 research outputs found
Goldfish control in the Vasse River: summary of the 2008 programme
No full textThis report summarises the results of the 2008 round of the feral Goldfish control in the lower Vasse River and comparisons made with previous control efforts since 2004
Fish fauna of the Vasse River and the colonisation by feral goldfish (Carassius auratus)
No full textDuring December 2003 and March 2004 a total of 7895 fish from nine species were captured during a survey of the Vasse River, including two sites in the Vasse River Diversion Drain. Of the fish captured, four were native freshwater fishes that are endemic to the south-west, three were native estuarine species and two were introduced fishes. Two estuarine species dominated the native catches with the western hardyhead (Leptatherina wallacei) being captured at the most downstream sites and the Swan River goby (Pseudogobius olorum) being captured throughout the river aside from the upper-most headwater site. The endemic western pygmy perch (Edelia vittata) was also widely distributed in the river, however, it was captured in relatively low numbers aside from immediately downstream of the Diversion Drain at a site with more complex in-stream and riparian habitat. The western minnow (Galaxias occidentalis) and nightfish (Bostockia porosa) were only captured in relatively low numbers at two sites each in the lower Vasse River. This study also captured the rare mud minnow (Galaxiella munda) at the headwater site, which is the first record of this species in the Vasse River.
The Vasse River is generally heavily modified and two introduced feral species, the mosquitofish (Gambusia holbrooki) and goldfish (Carassius auratus) have become established and accounted for over 60% of all fish captures. These species were particularly dominant in more degraded reaches of the river, such as the Diversion Drain and the lower Vasse River. The goldfish were captured in the lower Vasse River, between the Diversion Drain and immediately below the Old Butter Factory slot-boards. This stretch of the river has essentially become a heavily silted, stagnant pool due to the restriction of flow from the Diversion Drain and the presence of slot-boards, which together prevent adequate flushing of the system and that is likely to have facilitated the establishment of the feral species, as well as exacerbating algal blooms.
It is suggested that the introduction of goldfish into the Vasse River is relatively recent and the dominance of juveniles born in October last year will result in a rapid increase in the population in the next few years. Growth rates of goldfish in the Vasse River far exceed those reported elsewhere with individuals attaining lengths of over 180 mm TL at the end of their first year, the age at which they also mature. Goldfish are known to be vectors for disease introduction, may prey on native fish and their eggs and larvae, reduce aquatic plant biomass and re-suspend nutrients further fuelling algal blooms. Furthermore, recent studies have demonstrated that significant growth of cyanobacteria is stimulated by the passage through goldfish intestines. Goldfish, which attained lengths of over 40 cm in the Vasse River, therefore have the potential to contribute to algal blooms.
It is recommended that flushing of the river could occur by removal of the slot-boards at the Old Butter Factory and diverting flows from the Diversion Drain back into the river, thus attempting to return environmental flows to a more natural regime. Riparian vegetation should also continue to occur in this stretch of the River with estuarine species able to tolerate the higher salinities expected to occur as the River returns to a more natural, estuarine system.
A goldfish eradication program should be implemented in the lower Vasse River. This program would also provide an excellent opportunity to gain further information on their biology and ecological impact in the system, particularly with regard to their role in algal blooms. An education program should also be implemented outlining the problems caused by releasing aquarium fish into wild aquatic systems
Overview of the feral Goldfish Control Programme in the Vasse River, Western Australia: 2004-2006
No full textThe establishment of introduced fishes outside their natural range is often facilitated by a wide tolerance to environmental regimes, maximisation of reproductive potential, high genetic diversity and tendency for good dispersal mechanisms (r-strategists) (Stauffer 1984). An expression of a broad diet (e.g. omnivory) and the ability to tolerate degraded habitats also enables exotic species to exist and flourish in foreign environments. Within Australia, examples of omnivorous species that are highly adaptable to an array of environmental conditions include some of the poeciliids, cichlids and cyprinids; groups that are all traditional aquarium species but are naturally absent from the country (see Morgan et al. 2004). While the ecological impacts of some members of these groups are well understood, there is little information with regard to one of the most widely introduced freshwater fishes of the world, i.e. Goldfish (Carassius auratus). Feral populations of Goldfish have been reported from almost every state of Australia (McKay 1984, Koehn and MacKenzie 2004) and indeed are now found throughout much of the world (e.g. Fuller et al. 1999, Skelton 2001). They are also established in almost every state of the United States and are thought to be the first foreign fish species introduced into that country (e.g. Fuller et al. 1999). Goldfish have been implicated with the introductions of parasites to South Africa and Australia (Fletcher and Whittington 1998, Mouton et al. 2001, Hassan, Morgan and Beatty unpublished data) and with the decline of a number of native fishes in the U.S. (Deacon et al. 1964, Moyle 1976).
Within Western Australia, Goldfish are generally restricted to the south-western corner in the vicinity of major population centres where they appear to be most successful in modified or degraded waters (see Figure 1 and Morgan et al. 2004). The only previous biological study (growth and feeding) of wild Goldfish populations in Australia was conducted by Mitchell (1979) who used scales to age fish from South Australia, while Izci (2001) determined growth rates and age and sex compositions for a wild population of Goldfish in Lake Eğirdir, Turkey. The main aim of this study was to implement an ongoing control programme for Goldfish in the Vasse River and thereby reduce the biomass of the species. Secondary aims were to examine the distributions, habitat associations, age compositions, growth rates and diets of Goldfish in this eutrophic waterbody and to develop an understanding of factors contributing to their success
Section XII, 2B, 40 - Native Vocabulary. Southwestern District. Compiled by Hon. F.R. Barlee, Geographe Bay & Vasse.
No full textNative vocabulary compiled by Hon. F R Barlee (Geographe Bay and Vasse
Section XII, 2B, 12a - Native Vocabulary. Southestern District. Ngilgee of Vasse.
No full textNative vocabulary compiled by Ngilgi f., of Vasse Magisterial District (Burrong wongi, spoken in Bunbury and Vasse districts
Section XII, 2B, 47 - Native Vocabulary. Southwestern District. Compiled by Bussell, Vasse.
No full textNative vocabulary compiled by Mr Bussell (Vasse). See Ngilgi's vocabulary. She was reared in the Bussell household and educated by Mrs Bussell in the schoolroom of the home with Mrs Bussell's nine children
Section XII, 2B, 31 - Native Vocabulary. Southwestern District. Bunbury, Busselton and along the coast. (All words in Nyilgee's vocabulary, Vasse)
No full textNative vocabulary from Leaflet no 5 Bunbury, Busselton and along the coast. (All words in Nyilgee's vocabulary, Vasse
Les apothicaires de Maubeuge
No full textVasse Jean. Les apothicaires de Maubeuge. In: Revue d'histoire de la pharmacie, 44ᵉ année, n°149, 1956. pp. 323-325
Poétesse... et vaccin
No full textVasse G. Poétesse... et vaccin. In: Revue d'histoire de la pharmacie, 47ᵉ année, n°163, 1959. p. 198
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