Comments on: Blue Jellyfish numbers up http://www.bay-keeper.com/2009/11/blue-jellyfish-dead-on-beaches/ Say g'day to the Bay Wed, 01 Sep 2010 06:00:35 +0000 hourly 1 http://wordpress.org/?v=3.0.1 By: Nino http://www.bay-keeper.com/2009/11/blue-jellyfish-dead-on-beaches/comment-page-1/#comment-305 Nino Tue, 23 Feb 2010 11:32:19 +0000 http://www.bay-keeper.com/?p=799#comment-305 You've made some interesting suggestions Michael. But conventional wisdom is that if there's a drought on land it slows down production in the marine environment. Alongside the Werribee Treatment Plant, the Yarra is the major contributor of nutrient to the Bay; and it's the tidal movements at the Heads that flush the Bay, not river flows. Unless there's been a big increase in flows from Werribee, a drought will ordinarily mean less nutrient in the Bay. The 'whale in the bath-tub' has got to be the disposal of millions of tonnes of nutrient-rich Yarra sediments in the Bay, as has occurred over the past couple of years. You’ve made some interesting suggestions Michael. But conventional wisdom is that if there’s a drought on land it slows down production in the marine environment. Alongside the Werribee Treatment Plant, the Yarra is the major contributor of nutrient to the Bay; and it’s the tidal movements at the Heads that flush the Bay, not river flows. Unless there’s been a big increase in flows from Werribee, a drought will ordinarily mean less nutrient in the Bay. The ‘whale in the bath-tub’ has got to be the disposal of millions of tonnes of nutrient-rich Yarra sediments in the Bay, as has occurred over the past couple of years.

]]> By: Michael http://www.bay-keeper.com/2009/11/blue-jellyfish-dead-on-beaches/comment-page-1/#comment-304 Michael Tue, 23 Feb 2010 03:02:56 +0000 http://www.bay-keeper.com/?p=799#comment-304 One point to consider: The explosion in jellyfish seems to correspond with the years of drought. With so little water entering the bay from the rivers, the waste water flow from Werribie must be significant. This is rich in nutrients - hence a potential cause of algal/plankton bloom, providing jellyfish food. With the drought, little water is flushed out of the bay, allowing nutrient concentrations to keep increasing. Does anyone know of a correlation between jellyfish locations and currents from the Werribie outlet? Also: On ABC radio, a Tasmanian scientist was interviewed, & one of her statements was that trevally eat jellyfish. How are trevally numbers going? One point to consider:

The explosion in jellyfish seems to correspond with the years of drought. With so little water entering the bay from the rivers, the waste water flow from Werribie must be significant. This is rich in nutrients – hence a potential cause of algal/plankton bloom, providing jellyfish food. With the drought, little water is flushed out of the bay, allowing nutrient concentrations to keep increasing.

Does anyone know of a correlation between jellyfish locations and currents from the Werribie outlet?

Also: On ABC radio, a Tasmanian scientist was interviewed, & one of her statements was that trevally eat jellyfish. How are trevally numbers going?

]]> By: David http://www.bay-keeper.com/2009/11/blue-jellyfish-dead-on-beaches/comment-page-1/#comment-301 David Sat, 20 Feb 2010 03:35:51 +0000 http://www.bay-keeper.com/?p=799#comment-301 Would be great to have a system that tracks where the buggers are so we can avoid them. Would be great to have a system that tracks where the buggers are so we can avoid them.

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