Australian Aquatic Biological

Australian aquatic biodiversity research and consultancy

An expedition into the upper Clyde River system

 

Euastacus frehswater crayfish were abundant in the upper Clyde River

In October 2012 we conducted a survey of the upper Clyde River with the priority being to determine the freshwater crayfish species present within the upper catchment. It is currently unknown which freshwater crayfish species occur in this pristine and mostly inaccessible area. Our survey aimed at filling this knowledge gap and also record the other species present within the upland creeks and swamps.

The survey team. From the left: Rob McCormack; Hugh Jones; Paul Van der Werf; David Crass

The survey was a team effort with a group of us getting together to find and survey as many watercourses in the area as possible. The team consisted of;

David Crass – Southern Rivers Catchment Management Authority

Hugh Jones – Office of Environment and Heritage

Rob McCormack – Australian Aquatic Biological and Australian Crayfish Project volunteer

Paul Van der Werf – Earthan Group and Australian Crayfish Project volunteer

Hugh scooping and Paul photographing the catch in a tributary of the upper Clyde River

Hugh scooping and Paul photographing the catch in a tributary of the upper Clyde River

The area of interest is entirely within the Morton National Park and with the aid of Libby Shields and Rob Perry who are the local National Parks and Wildlife Service rangers for the area we gained access to the whole park which has a series of maintenance roads through it. It was very fortuitous that we could gain access as it would have taken us ages to cover the area on foot. Libby told us some of the roads were currently impassable but we had Hugh Jones at the wheel of his Toyota troop carrier and though some of the roads proved extreme they were all passable for Hugh and his V8 diesel troop carrier.

Hugh at the wheel of his car with Paul beside him. The roads were extreme.

Hugh at the wheel of his car with Paul beside him, I was hanging on in the back taking this photo and waiting for it to roll. The roads were extreme but Hugh got us out and back safely.

Unfortunately, they were far too extreme for both Pauls and my Great Walls so we left them discarded along the side of the track and loaded into Hugh’s beast for an exciting 4 wheel drive adventure. We came within millimetres of rolling the troopy in a pothole at one point but Hugh ground us up and out of what we described as a bomb crater. Much of the area we were surveying was part of the old bombing range and there were signs up everywhere warning of unexploded ordinance.

Paul and my Great Walls were no match for the rough roads and we were lucky to have Hugh’s Toyota for the extreme roads.

The upland streams in the area were relatively cold being 9-12⁰C and very low pH (4-5) without much biodiversity. The upper streams were without fish though they did occur at lower altitudes. We were unable to find any shrimp, crabs, snails or mussels but both macro invertebrates and tadpoles were common and freshwater crayfish were abundant in many of the larger streams. The area was pristine and a tribute to the NSW National Parks for the management and protection of the area. This survey is part of a series of the area and a report on our findings will be submitted to the Southern Rivers Catchment Management Authority and we are thankful to them for assisting with funding for our surveys.

Blue Mountains Tree Frogs (Litoria citropa) were common in the area

 

 

 

Aquatic Biodiversity Survey and Baseline Mapping of Freshwater Crayfish and Aquatic Species of the Gosford Local Government Area

As Part of the Australian Crayfish Project and a sub project 100056 we have been conducting aquatic biological surveys the whole of the Gosford LGA. This project is major sponsored by Australian Aquatic Biological and receives sponsorship from Gosford City Council under their Ecological Research Grants scheme 2010. The project reached fruition in May 2012 with a total of ten aquatic biological catchments reports being issued to Gosford City Council.

The biological surveys were undertaken as part of both the broad Australian Crayfish Project (ACP) and Australian Aquatic Biological Survey (AABS) and a targeted sub-project on the Gosford LGA, Project 100056, Australian Aquatic Biological 2010.

Gosford LGA Aquatic Survey Reports

Gosford LGA Aquatic Survey Reports

Surveys of the Gosford LGA are completed on a catchment/drainage basis and a total of ten catchment areas were independently surveyed.

1 Wamberal Lagoon

2 Terrigal Lagoon

3 Avoca Lagoon

4 Cockrone Lagoon and Surrounds

5 Green Point to Kilcare & Bouddi NP – Coastal Streams

6 Erina Creek

7 Narara Creek 100056-7 Completed 67, 77, 78, 86, 87.

8 Point Clare to Mullet Creek

9 Mooney Mooney Creek

10 Mangrove Creek to Wisemans Ferry

This was a two year project that discovered much new information The primary aim of Project No. 100056 is to determine what freshwater crayfish occur where in the Gosford LGA. Primarily freshwater crayfish are the priority and the Gosford LGA represents a significant area for crayfish distributions, yet little is known on the distributions of crayfish in this area. Prior to the start of this research project only two species have recorded distributions within the LGA (Euastacus australasiensis and Euastacus spinifer) yet the extent of their distribution are unknown. Additionally, the area includes a number of coastal lagoons, lakes and streams all with independent catchments draining directly to the Tasman Sea that have been isolated from each other for millions of years and many containing unrecorded crayfish species.

Euastacus australasiensis from Narara Creek, NSW

Euastacus australasiensis from Narara Creek, NSW

Euastacus spinifer from Kilcare, NSW

Euastacus spinifer from Kilcare, NSW

The project also records information on all the other aquatic fauna found in the LGA as well as information on landforms and vegetation. All this is in order to facilitate the better conservation and management of the aquatic ecosystems of the Gosford LGA.

Note: For environmental and hygiene reasons (transfer of pests, diseases and weeds, etc.) each of the catchments are treated as individual systems and are surveyed separately with equipment and personnel being sterilized between catchments. A copy of our Hygiene Protocol and Code of Practice is available online at www.aabio.com.au

Gramastacus sp. from Wamberal Lagoon, NSW

Gramastacus sp. from Wamberal Lagoon, NSW

We managed to map the distributions of four freshwater crayfish species that occur in the Gosford LGA. Euastacus australasiensis, Euastacus spinifer, Cherax destructor and Gramastacus sp.

Cherax destructor from Mooney Mooney Creek, NSW

Cherax destructor from Mooney Mooney Creek, NSW

The White Cloud Mountain Minnow Tanichthys albonubes

Australian Aquatic Biological P/L Report 100056-8 to Gosford City Council included a survey of Green Point Creek at Pearl Beach, NSW. The creek was surveyed at the crossing on Diamond Road.

Green Point Creek

Green Point Creek

Here the creek here was strongly flowing over a sandy stream bed. There were shallow areas and deeper holes. The banks had some rock retaining walls but were well shaded with ferns and palms, etc. The creek was extremely healthy with abundant aquatic species present. Some plague minnows Gambusia holbrooki were present, we observed a small long finned eel, several flat headed gudgeons, many striped gudgeons and common jollytails.

The striped gudgeon Gobiomorphus australis

The striped gudgeon Gobiomorphus australis

The common jollytail Galaxias maculatus

The common jollytail Galaxias maculatus

Further upstream at Tourmaline Avenue the creek was surveyed again, here the stream was again sandy based with deeper holes and looked in excellent condition. We surveyed the stream finding only dozens of striped gudgeons and surprisingly the White Cloud Mountain minnow Tanichthys albonubes. The White Cloud Mountain minnow is an exotic freshwater fish. It is a species that would normally be found in a fish tank so it is alarming that this exotic species is established in numbers within this stream. It is a robust species and a member of the carp family being a native of China. Their robust nature and bright colouration makes them popular as an aquarium species and they are not normally found in natural waterways of NSW.

The White Cloud Mountain minnow Tanichthys albonubes

The White Cloud Mountain minnow Tanichthys albonubes

I did some research on this species and found that, NSW DPI has known about this feral population since late 2002 and continues to monitor the situation. Unfortunately, one of the specimens collected was gravid so conditions were suitable for breeding which is a big worry. Discussions with residents in the area report Australian Bass and eels in the deeper holes and freshwater crayfish further upstream.

White Cloud Mountain minnows from Green Point Creek, Pearl Beach, NSW

White Cloud Mountain minnows from Green Point Creek, Pearl Beach, NSW

Discussions with the Australian Museum also record this species from Piles Creek at Somersby, NSW. We did a preliminary survey of this creek specifically targeting the White Cloud Mountain Minnow but were unable to find it. That does not mean it’s not there however, it does indicate that it’s not proliferating well and numbers are either very small or scattered, etc. Unfortunately, we did find invasive Cherax destructor proliferating in the stream so that was not so good news.

The yabby Cherax destructor from Piles Creek, Somersby NSW

The yabby Cherax destructor from Piles Creek, Somersby NSW

Taxonomy, distribution and ecology of the Setose Yabby, Cherax setosus

Jason and I have been researching the setose yabby for some time now. This is one of the four terrestrial type Cherax crayfish that occur in Australia and it is part of a series of research projects on these four species (Cherax rotundus, Cherax sp. nov., Cherax punctatus and Cherax setosus). All these species prefer terrestrial habitats and display heavy setation on the lateral propodal surface of the claws.

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Cherax depressus from the Great Sandy National Park, Queensland

Cherax sp

Cherax depressus

Freshwater crayfish are amazing animals that are not restricted to aquatic environments.  Paul and I were driving through the Great Sandy National Park, Queensland and we discovered burrows in the grassy verges. Now finding the burrow is one thing, finding the grayfish is another thing all together.

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