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 Post subject: Knysna: INFO
Unread postPosted: Fri Dec 22, 2006 9:17 pm 
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Joined: Thu Dec 29, 2005 11:54 am
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We recently did a few dives in Knysna lagoon to have a look at the changes in bentic life after the august floods in the lagoon.
It was quite depressing to note that most of the marine species on the bottom had disappeared.
However , we have seen this phenomenon before, and the recovery was usually fairly rapid. This year things are taking a little longer to come back.
One very interesting appearance was a little scorpionfish, probably Pterois miles, that was found under the jetty at Thesen Island.The last time I saw a Scorpionfish on the South coast wasmore than twenty years ago in tsitsikamma.
The sea around here is also full of a very beautiful little purplish brown jellyfish this year. They also wash into the lagoon.
We will watch the bottom dwellers carefully and will report on any new arrivals.

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Unread postPosted: Wed Dec 27, 2006 12:10 pm 
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Location: Red sand, why do I keep thinking of red sand?
Was this due to the mud deposited, or the force of the water?

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Unread postPosted: Wed Dec 27, 2006 7:24 pm 
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Thanks for the interesting info seahorse. :)


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Unread postPosted: Mon Jan 08, 2007 2:50 pm 
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I agree with Reinette - a very interesting post, Seahorse.

When I think of the devastation caused by floods, I always think about what happens on land, and not on their underwater impact. So I found your post very thought-provoking.

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Only two things are infinite, the universe and human stupidity, and I'm not sure about the former. - Albert Einstein (1879-1955)


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 Post subject: Flood damage Knysna Lagoon.
Unread postPosted: Mon Jan 15, 2007 9:23 pm 
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There are several causes for the deaths after the floods.
One reason would be the suspended solids from the erosion during the storm.
Another possible cause could be changes in chemical composition of the water , but in all probability the most deaths were caused by prolonged immersion in fresh water.
Vast amounts of fresh water was trapped in the lagoon for days.
Marine animals can not tolerate fresh water for long. Most of the sessile animals were just subjected to fresh water for too long.

An interesting development at the moment, is the development of a layer of marine filamentous algae all over the bottom. It covers the layer of silt on the bottom as well as most of the remains of animals left behind.
We can already see some new colonizers developing in Featherbed bay. There are also lots of sponges starting to grow on any hard surface.

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 Post subject:
Unread postPosted: Tue Jan 16, 2007 5:52 pm 
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Thanks for the update, Seahorse! :thumbs_up:

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