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- Video conference notes 30 April - Migrations
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Mandy provided an overview of the species decline where historical abundance in the southern hemisphere was estimated at 70, but by the 's fewer than remained. The South West Australia population is approximately 2, and recovering at the maximum biological rate. In Victoria it is considered Critically Endangered due to the low numbers and low rate of recovery in the South East Australian population which is estimated to be less than individuals. Mandy spoke about the Department of Environment, Land, Water and Planning incidental sightings database which commenced in to present.
This database now contains important information regarding sightings, locations, dates and breeding. Many said many of the seasonal whale sighting along the Victorian coast are mainly migratory whales. The catalogue now has about images which comprises whales. Within that only about 12 whales use the Logans Beach area for calving.
The photo identification has enabled seasonal tracking of movements between Victoria, New South Wales and Tasmania. Some of the regular Southern Right Whales to calve at Logans Beach are identified by their unique callosities and given names by observers. Mandy said genetics work which commenced in the early 's showed evidence of significant differentiation between South Africa, South America, Australia WA and NZ Patenaude et al Further analysis of genetic and stable isotope data was collected to Carroll et al in prep. The main threats for this species now that commercial whaling is banned is collision with vessels, entanglements, illegal whale watching and potential impacts from seismic surveys.
Unusual sighting of mating activity photographed off Port Fairy. Southern Right Whale.
Video conference notes 30 April - Migrations
Southern Right Whale - south east Australia monitoring project. Jason spoke about tracking studies in the Glenelg River estuary, in south west Victoria. The Mulloway is a large fish about 1. Recent research has found the population structure is different between eastern and western South Australia Ferguson in press.
There is recruitment in Murray mouth area but no evidence of breeding within the vicinity of Glenelg River estuary. Jason said his research is focusing on the patterns, timing of movement and habitat use between estuary and the surrounding Southern Ocean and where they go when they leave the estuary.
Changes in water flows and salinity are studied to see how these might influence the movement of Mulloway. Jason explained a system of 19 receivers to detect acoustic tags of fish swimming past were set up in the Glenelg River from the estuary mouth to 67 km upstream. Two fish were tagged in February Daily discharge records were obtained from a gauging station at Dartmoor 70 kilometres upstream — top of estuarine influence.
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Analysis of flow information found as the flows increased the average distance to the mouth decreased which indicates the Mulloway have a preference for more saline conditions. This graph represents the preferred location of Mulloway in the river the highest number of detections being in the lower section of the river ,. Jason found the Mulloway are quite a mobile species.
Fish moved up to 50 km over a three day period in either direction upstream or downstream irrespective of time of day. He also found fish often schooled up moved together. Most fish tend to leave the estuary for the sea in December to January with a preference for high flow events. Some tagged fish came back between September to November which is believed to be the time when new fish enter estuary.
It was found that Mulloway leaving the Glenelg Estuary and travelling to the Murray Mouth were all estimated to be 5 — 7 years old which is the age they reach maturity. It is known that the Glenelg system does not have any recruitment of juveniles but there is known recruitment to Coorong Murray mouth in late summer suggesting that the fish from the Glenelg system are leaving to possibly breed in the Murray mouth area.
Jason noted the huge angling pressure on Mulloway in the Glenelg River and the implications for management in South Australia and Victoria.
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As the Mulloway are so interlinked between the two areas he felt there needs to be greater cooperation between states to protect the species Size ranges, flows, protection of breeding population, etc. The Glenelg system needs to be open during early summer for adults to exit to breed. Environmental flows may be required in the Murray River to support spawning and the Glenelg River to allow migration especially if climate change occurs as predicted.
Jason spoke about further genetic studies required to determine where the Barwon, Maribyrnong and Yarra populations fit in. Are they part of the South Australian population or a separate subpopulation? Jason provided a brief overview of research conducted by Dr Wayne Koster. He said research has shown Australian Grayling migrate down from a freshwater environment to an estuary environment to breed.
Breeding takes place in April - May and coincides with increased flows or flush of the system. Once spawning has taken place the adult fish move back up the system leaving eggs and larvae in the estuary where they can be swept out to sea remaining for 6 months before returning into the river system. Chart showing the movement of Grayling downstream to spawn which coincides with a flush of the system in April - May.
Flows are an important cue for movement to trigger spawning which may need environmental water for the cue. Jason provided an overview of research related to Macquarie Perch, flows, migration and spawning conducted by Dr Wayne Koster and Zeb Tonkin. The spawning cue coincides with a high flow event in December.
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