zondag 27 januari 2013

2013-01-27 09:26 hbos Ponton visit.


Weather : Clouded / SW wind 5 bft / Rain > 1 mm / 996.0 hpa
Divers : Martien, Paul, Axel,
Goal : General look around
Max depth : 17.8 mtr
Duration : 45 minutes
Air temp : 4.0 celsius
Water temp : 3,0 celsius minimum
Fish: > 1 Zander at 9 mtr, Copepods in watercolumn but less than last week. Shrimp on bottom.
Baseline visibility: estimated 7 mtr
Secchi visibility: estimated + 3 = 10 mtr
Plants: Elodea is virtually gone down to 7 mtr depth apart from a few single small plants. It is funny that at > 10 mtr  Elodea in unrooted (tumbleweed like) bushes remain constant in size and colour.

Comment: Mussels at North Side remain below 9 meters depth in a distinct border. 
We started the dive going traight forward through the beautiful boulders of clay. Shrimp are triggered by the divelights and dance up and down. By coinsidence we stumbled upon the hanging weights of the 
Northwest pontoon. It still has more old fishinglines which need to be removed. My fingers were very numb so I didn't bother to remove them this time. We followed the rope going exactly south to the anchorpoint of the yellow buoy. Going NW we slowly ascended to 9 meters and swam back to the entry point.
You could feel a very faint underwater current generated by the wind. 
At 4 minutes in the dive there is a coldspot at 13 mtr depth going from 2,4 celsius to 1,6 celsius for about 10 seconds. 

vrijdag 25 januari 2013

Read all about it!!! Hbos hits the newspaper


Our Project Baseline Haarlemmermeer appears in an article about the Catfish.
Full article is available in the newpaper of Haarlems dagblad issue of 25-01-2013.




zondag 20 januari 2013

2013-01-20 08:55 hbos Fish with damage.


Weather : Clouded / E wind 5 bft / Rain 0 mm / 997.0 hpa
Divers : Iva, Remko ,Axel,
Goal : Visibility and SETL check
Max depth : 9.5 mtr
Duration : 39 minutes
Air temp : -5.0 celsius
Water temp : 5,0 celsius minimum
Fish: > 1 Zander wounded near th eye and has common fishleach on it's eye and on it's head. 1 small perch on the pile. Two dead eals and a wounded Pike also with common fishleach on it.
Baseline visibility: 3 mtr depth -> 8 meters.
Secchi visibility: 3 meter depth -> 11 mtr
Plants: Elodea is virtually gone apart from a few single small plants.

Comment: Mussels at 3 meters and 6 meter begin to dislodge from measurement pile. See photos 
A lot of copepods are swimming in the watercolumn. 
Two copepods found feeding on dead shrimp at about 3,5 mtr depth.
Robin found a new rubber fishing-lure 
Fish seem to become a little weaker.

SETL H136 Start 27-09-12 (grows very small mussels on it which are now bigger than the ones I had found on H135.
SETL H106 Start 15-12-12 has some brown patches (diatoms) on it.





dinsdag 15 januari 2013

Nieuw!!! log je duik

Vanaf nu kun je je duik loggen en je bevindingen worden verwerkt in een spreadsheet.
Na ingave is je ingave direct zichtbaar in het logboek.
Jullie ingave wordt gebruikt om een beter beeld te krijgen van de plas.
Ga naar het tabblad Log je duik en lees wat voor informatie wij vragen.
Alvast bedankt voor jullie input!

zondag 6 januari 2013

2012-01-06 09:02 New years madness


Weather : Sunny / NW wind 3 bft / Rain 0 mm / 1029.0 hpa
Divers : John, Kacper ,Axel,
Goal : Follow bottom profile upto 20 mtr depth.
Max depth : 20.1 mtr
Duration : 57 minutes
Air temp : 10.0 celsius
Water temp : 6,6 celsius minimum
Fish: > 1 eal, 1 catfish, 1 pike at 18 mtr
Baseline visibility: 6 mtr depth -> 8 meters.
Secchi visibility: 6 meter depth -> 11 mtr
Plants: New shoots coming. Even at 18 mtr Elodea is growing a bit showing fresh new leaves.
Remarks > 30 divers. We were as early as possible to get into the water before the hurd of divers would make their new year dive. There were 4 divers before us. We followed the bottom profile until we reached 20 mtrs. I saw a glimps of the catfish but left it alone. In the bottom you can see where it embeds itself. We pushed on further and spotted more spots where catfish rest. On the way back visibility came near zero as a group of divers tried to find their way. A thick sandstorm like wall came towards us and we ascended a bit to avoid it. 
Actually I'm not bothered with that cloud of dust in the catfish area. At least they can enjoy some peace and quiet down there until the dust settles again. 
Left you see a depthprofile. Route and depth related to map is not measured, but it gives an idea.

dinsdag 1 januari 2013

SETL rapport H135 veel mosseltjes!!!


Bij deze het eerste rapport van SETL plaat welke op 16-12-2012 is opgehaald.
Rapport SETL plaat H135 

Zo op het eerste gezicht is de plaat kaal.....maar schijn bedriegt.