Northern Pacific Seastar Cull – Sunday 15 April – meet at Mullins Court Carpark at 9am. Please register at Contact Us.
What a combo!
On 17 December 2011 – You get to count fish at 10 am and then help remove NP seastars at 12.00.
Also a BBQ in between. Please see below and be sure to ‘contact us’ to register. This is so we can let you know if it is cancelled on the day.
Jawbone Marine Sanctuary Conservation Activity
On Saturday, 17 December, the Jawbone Marine Sanctuary Marine Care Inc. (JMSC) group, with Parks Victoria and Reef Watch, will hold two activities:
Great Victorian Fish Count – 10:00 am:
The Great Victorian Fish Count is an annual survey ofVictoria’s unique and colourful marine reef fish populations. If you dive or snorkel, you can count fish.
By counting fish at the same time every year, we can collect data that will provide long-term information on:
- Species lists at specific Victorian subtidal sites.
- Species suites and their associated environments.
- Species abundance.
- Changes in species distributions over time.
- Extensions of species ranges.
All survey materials will be provided, and you will be
instructed on how to take part in the survey.
North Pacific Seastar removal – 12:00 pm:
The Northern Pacific Seastar (Asterias amurensis) is an introduced pest (see notes on other side) that is a voracious predator and may have a significant impact on the ecology of Jawbone Marine Sanctuary.
Its removal has been authorised by the Department of Primary Industries (DPI) through permit NP192*. This permit allows JMSC and Parks Victoria to run projects in the Jawbone Marine Sanctuary that are aimed at controlling some of the introduced species, including Asterias.
*Please note that it is illegal to remove anything from a protected marine area without correct authorization.
If you want to take part in these activities and learn more about the Great Victorian Fish Count and this introduced species you will need to:
- Contact David Speller on 0417 149 952 to confirm your attendance
- Bring your own snorkeling or dive equipment on the 17th December
- NOTE: BBQ and some refreshments will be supplied
If you are interested in joining or finding out more about the Jawbone Marine Sanctuary Care group, visit our website: www.jawbone.org.au
The Northern Pacific Seastar
The Northern Pacific Seastar (Asterias amurensis) is an introduced marine pest that is currently found in two locations inAustralia: the Derwent Estuary inTasmania (1992) and Port Phillip Bay (1998) inVictoria.
It’s considered a serious pest inAustraliabecause of its impact on native marine ecosystems and marine industries such as shellfish farming.
Northern Pacific Seastars are known to have a negative impact on native marine organisms, mainly because they are voracious predators that eat a wide range of native animals.
In Tasmania’s Derwent estuary for example, they have become the dominant invertebrate predator and have been directly implicated in the decline of the endangered spotted handfish (Brachionichthys hirsutus). It’s suspected that the seastars prey on handfish egg masses, and/or on the sea squirts (ascidians) that handfish use to spawn on.
The Northern Pacific Seastar has the potential to rapidly establish large populations in new areas. For example, recent estimates indicate the population had reached 12 million two years after they were first detected inPort Phillip Bay. Tens of thousands of seastars have been removed in eradication attempts, but with little impact on overall population numbers. Even inJapanwhere the seastars are native, some populations show ‘boom and bust’ cycles, reaching plague proportions for two to three years followed by rapid declines.
What can be done about this introduced pest?
Because the seastars are highly productive (females release up to 20 million eggs each),100 percent of the population must be removed for an eradication attempt to be effective. If just a few individuals are left the population will successfully breed.
The Northern Pacific Seastar is now established inPort Phillip Bay. The seastars are present as adults and larvae inPort Phillip Baywaters at various times of the year.
Current technology is unable to eradicate this species from the Bay without causing severe side effects to the environment. Therefore the current priority is to stop this marine pest from spreading to new areas alongVictoria’s coastline.
What can be done at Jawbone Marine Sanctuary?
Jawbone Marine Sanctuary has been set aside as a marine protected area because it contains a range of ecosystems that are unique in Port Phillip and that were protected for over 100 years when the Merritt rifle range was active.
While the Northern Pacific Seastar is unlikely to be eradicated, with ongoing attention and removal of the Seastar we may be able to protect sensitive areas from this predator’s impact, and prevent it from becoming a dominant predator.
Note: The Northern Pacific Seastar is often confused with the native 11-armed Seastar, an important local species. This confusion is one of the reasons the Northern Pacific Seastar can only be removed under permit and with proper supervision. More detailed information about the 11-armed Seastar and other seastar species will be provided to all who take part in this activity.