LOGIN

RSS Facebook Twitter YouTube
GLOSSARY       

SEARCHGLOSSARY

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

PROFILESEARCH

Avatar

Please consider registering
guest

sp_LogInOut Log In sp_Registration Register

Register | Lost password?
Advanced Search

— Forum Scope —




— Match —





— Forum Options —





 

Minimum search word length is 4 characters - maximum search word length is 84 characters

sp_Feed Topic RSS sp_TopicIcon
Delta Del Llobregat
December 10, 2009
9:14 pm
Avatar
Matt
Málaga, Spain
Admin
Forum Posts: 8239
Member Since:
June 13, 2011
sp_UserOfflineSmall Offline

Finally a continuation of this earlier thread. Since then some progress has been made and, thanks to Roberto, it looks like we have the chance to attempt an introduction of the fish early next year. *puts on S.E.I. spokesman's badge* Now while we're aware of negative aspects to introducing fishes to new habitats, not least those that have been spawned in captivity, this a special case in some ways. Before going on to explain, I should stress that none of the places in the images below are accessible to the public and special permission is required from the local environmental department. *takes badge off* /tongue.gif" style="vertical-align:middle" emoid=":p" border="0" alt="tongue.gif" />

Basically, in an attempt to control mosquito breeding in temporarily-flooded zones around the Delta the local government has elected to dig a series of 7 small but permanent pools in the mossie breeding grounds. These will then be stocked with fishes that prey on mosquitoes and their larvae, and if we don't put Aphanius iberus there Gambusia will be used. The pools aren't even remotely connected to any other water body and no other fishes will be added so it at least offers us an opportunity to avoid the use of non-native species and see if the Aphanius become established.

On Sunday Roberto took Manuel, Juan Pablo, Enrique and I to see the first of these pools plus a couple of other sites he thinks might have potential for introduction of A. iberus, one of which I'd already seen last year. We also revisited Laguna del Remolar as Roberto had been unable to catch any Aphanius on his last couple of visits and we needed to verify it still exists there.

Here's the first completed pool, the plan is to throw in 2-300 fish early next year and see how they do via regular visits (Roberto, Enrique and myself will split most of these duties as Manuel and Juan Pablo are based miles away in Zaragoza).

[Image Can Not Be Found]

This is the area around the pool which becomes flooded at certain times of the year.

[Image Can Not Be Found]

[Image Can Not Be Found]

The water is fairly clear and the substrate is a heavy, clay-type soil. There's no aquatic vegetation but presumably there'll be plenty of algae during warmer months, and we spotted a few different types of aquatic invertebrate so there appears to at least be the potential to support life here.

[Image Can Not Be Found]

Attached files

[Image Can Not Be Found] [Image Can Not Be Found] [Image Can Not Be Found] [Image Can Not Be Found]

Cake or death?
December 10, 2009
9:39 pm
Avatar
Matt
Málaga, Spain
Admin
Forum Posts: 8239
Member Since:
June 13, 2011
sp_UserOfflineSmall Offline

Location 2 was near the beach and rather beautiful. The introduction of the fish here is still a fair way off as first they must prove successful at locality 1. There are no other fishes here as far as we could see.

[Image Can Not Be Found]

The water here was very clear indeed, basically as salty as sea water and the substrate mostly sandy. Most of the water you can see here is only temporary; the area to the right in the third image is the only permanently wet part.

[Image Can Not Be Found]

[Image Can Not Be Found]

[Image Can Not Be Found]

It was here also that Juan Pablo discovered we were eating in a Japanese restaurant later on. /laugh.gif" style="vertical-align:middle" emoid="Laugh" border="0" alt="laugh.gif" />

[Image Can Not Be Found]

Onto Laguna de Ca L'Arana where again the plan might be to introduce the fish much later on. There was far less water here than last time:

[Image Can Not Be Found]

This is how it looked in September 2008.

[Image Can Not Be Found]

The freshwater channel that previously drained into the lagoon is now dry so the Gambusia that lived there are gone. /thumbs_up.gif" style="vertical-align:middle" emoid=":thumbsup:" border="0" alt="thumbs_up.gif" />

[Image Can Not Be Found]

The marginal vegetation was very sparse and we couldn't find the Aponogeton species that grew here last year. Since that plant only grew directly in the outflow of the freshwater channel it's easy to understand why.

[Image Can Not Be Found]

The lagoon is situated between a landing strip of El Prat airport and the Mediterranean, a typical location for many of Spain's remaining coastal wetlands. /rolleyes.gif" style="vertical-align:middle" emoid=":rolleyes:" border="0" alt="rolleyes.gif" />

[Image Can Not Be Found]

[Image Can Not Be Found]

Taking water samples. The specific gravity here was 1.029!

[Image Can Not Be Found]

Since that was a bit of a shock Juan Pablo decided to test the seawater which measured 1.030 or 1.031 (can't remember exactly).

[Image Can Not Be Found]

Attached files

[Image Can Not Be Found] [Image Can Not Be Found] [Image Can Not Be Found] [Image Can Not Be Found] [Image Can Not Be Found] [Image Can Not Be Found] [Image Can Not Be Found] [Image Can Not Be Found] [Image Can Not Be Found] [Image Can Not Be Found] [Image Can Not Be Found] [Image Can Not Be Found] [Image Can Not Be Found]

Cake or death?
December 10, 2009
9:48 pm
Avatar
Matt
Málaga, Spain
Admin
Forum Posts: 8239
Member Since:
June 13, 2011
sp_UserOfflineSmall Offline

Our last mission was at Laguna del Remolar; it's been surrounded by an electric fence since our last visit to prevent horses from crapping in it. This is the one that had me on my a**e twice. /dry.gif" style="vertical-align:middle" emoid="<_ <" border="0" alt="dry.gif">

[Image Can Not Be Found]

The water level was lower here too, presumably a seasonal thing.

[Image Can Not Be Found]

The lagoon is split into two by a raised area, seen in the foreground here.
Location43.jpgImage Enlarger

...and as before no Aphanius were found in the larger, deeper part.
Location44.jpgImage Enlarger

Anyone know what this is for?
Thing-1.jpgImage Enlarger

Hard to believe this is the last remaining habitat of this population.
Location45.jpgImage Enlarger

Anyway while at first we couldn't find anything our persistence was rewarded and we ended up with 8 females and 4 males (plus thousands of Gambusia) which believe it or not represents the most productive collection day this year. Sorry no good pics of the fish; hopefully I'll be able to snag a better image from one of the others.
Location46.jpgImage Enlarger

Well that's it, will keep this updated as things move on and hopefully we'll get some interesting results. /smile.gif" style="vertical-align:middle" emoid=":)" border="0" alt="smile.gif" />

Attached files

[Image Can Not Be Found] [Image Can Not Be Found]

Cake or death?
December 11, 2009
9:14 am
Avatar
Mark Duffill
Community Helper
Forum Posts: 1012
Member Since:
August 12, 2008
sp_UserOfflineSmall Offline

Excellent stuff Matt, keep us updated /thumbs_up.gif" style="vertical-align:middle" emoid=":thumbsup:" border="0" alt="thumbs_up.gif" />

It certainly does look a lovely place, that contraption looks like some kind of trap, it would be interesting to see what is under the water - Fish trap /huh.gif" style="vertical-align:middle" emoid=":huh:" border="0" alt="huh.gif" />

My only other thought would be some sort of artificial platform used for terrapins or other animals that would need to come out of the water /wacko.gif" style="vertical-align:middle" emoid=":wacko:" border="0" alt="wacko.gif" /> certainly is a strange one

December 11, 2009
9:26 am
Avatar
mzapater
Member
Forum Posts: 70
Member Since:
July 30, 2008
sp_UserOfflineSmall Offline

Hi everybody,

The trap is intended to catch Pseudemys scripta. They stay on top to sunbathe, then the string is pulled and they fall into a net. Roberto told us that it´s proving quite succesful.

The P. scripta get to breed in Barcelona, even Roberto gets some new ones in his garden every year.

Thanks for letting everybody know about what we´re doing Matt, hope next year will be a good one for the project. And thanks a lot for your help!!

Just a little question, the "reintroduction" of the A. iberus into these new lagoons has also the goal to stablish this particular strain, which seems to have some genetic differences with the northern populations (Estartit and so on), and also the southerns (Delta del Ebro, etc.), so it may be worthwile raising the numbers of them since their state at the Remolar lagoon is so critical now.

Best regards,

Manuel...

December 11, 2009
10:38 am
Avatar
keith565
Veteran
Forum Posts: 761
Member Since:
February 8, 2008
sp_UserOfflineSmall Offline

i have to second MD's comments, well done guys. it's heartwarming to see folk put in so much effort to help save an endangered species.
i look forward with relish to see the next installment.

December 12, 2009
3:34 pm
Avatar
Plaamoo
Bellingham, Washington U.S.A.
Community Helper
Forum Posts: 1257
Member Since:
March 14, 2009
sp_UserOfflineSmall Offline

looks like a great project guys! Very interesting, wish I was there to help! Thanks for sharing Matt and best of luck with the fish!! look forward to updates.

December 14, 2009
3:22 pm
Avatar
coelacanth
Veteran
Forum Posts: 514
Member Since:
July 30, 2008
sp_UserOfflineSmall Offline

Have you got anyone who can do some proper invertebrate surveys? Would help in increasing the depth of knowledge on the various habitats, potential food items etc. etc.

Are decent airguns available in Spain? In the hands of a good shot, they are pretty effective at getting rid of nuisance animals, including Pseudemys.

December 14, 2009
7:55 pm
Avatar
Eyrie
Veteran
Forum Posts: 571
Member Since:
March 21, 2008
sp_UserOfflineSmall Offline

Very interesting to read about what you're doing, and best wishes.

Mature, sensible signature required for responsible position. Good prospects for the right candidate. Apply within.
December 15, 2009
2:05 pm
Avatar
Matt
Málaga, Spain
Admin
Forum Posts: 8239
Member Since:
June 13, 2011
sp_UserOfflineSmall Offline

QUOTE (coelacanth @ Dec 14 2009, 04:05 PM) < {POST_SNAPBACK}>
Have you got anyone who can do some proper inverebrate surveys? Would help in increasing the depth of knowledge on the various habitats, potential food items etc. etc.

One of my main worries is about food sources especially at the latter two locations so I think this would be really useful. Any suggestions Pete? I did some entomology modules and field studies at uni but am by no means experienced. Presumably it'd be best to sample at various times throughout the year?

QUOTE (coelacanth @ Dec 14 2009, 04:05 PM) < {POST_SNAPBACK}>
Are decent airguns available in Spain? In the hands of a good shot, they are pretty effective at getting rid of nuisance animals, including Pseudemys.

They are. Do you fancy a trip over? /tongue.gif" style="vertical-align:middle" emoid=":p" border="0" alt="tongue.gif" />

Thanks for all the comments guys, it's great to know people are interested in this. /smile.gif" style="vertical-align:middle" emoid=":)" border="0" alt="smile.gif" />

Cake or death?
December 16, 2009
12:58 pm
Avatar
coelacanth
Veteran
Forum Posts: 514
Member Since:
July 30, 2008
sp_UserOfflineSmall Offline

QUOTE (Matt @ Dec 15 2009, 01:48 PM) < {POST_SNAPBACK}>
One of my main worries is about food sources especially at the latter two locations so I think this would be really useful. Paul any suggestions? I did some entomology modules and field studies at uni but am by no means experienced. Presumably it'd be best to sample at various times throughout the year?

Yeah, you need to talk to a Uni about this, I'd have thought that they'd jump at the chance to have some students doing work on an existing project. In the UK it would usually cost to get someone in to do an ecological survey and to be honest I've found them to be variable in the quality of what they deliver. Not sure what the situation is over there (there might be EU money available for this, it's worth checking, alternatively talk to the local goverment people).
Where Gambusia are present, it'd be good to get students working on gut content analyses, that should provide some useful data.

Have you got this paper, BTW? Might be some useful information in there http://www.uv.es/see08/articul...../caiola%20...ologia_2001.pdf

December 16, 2009
2:25 pm
Avatar
Matt
Málaga, Spain
Admin
Forum Posts: 8239
Member Since:
June 13, 2011
sp_UserOfflineSmall Offline

Thanks some real food for thought there. The University of Girona have an aquatic ecology department and have done a few papers on Spanish species so will have a chat with Roberto; personally I think it's definitely worth contacting them after the holidays.

Cake or death?
April 22, 2010
2:48 pm
Avatar
Matt
Málaga, Spain
Admin
Forum Posts: 8239
Member Since:
June 13, 2011
sp_UserOfflineSmall Offline

Well the first 25 Aphanius will be released next Thursday (news piece dated 16/04). I'll be accompanying Roberto to record everything.

Cake or death?
April 24, 2010
8:50 am
Avatar
keith565
Veteran
Forum Posts: 761
Member Since:
February 8, 2008
sp_UserOfflineSmall Offline

wow, fantastic mate, fingers crossed everything goes ok.

April 30, 2010
1:17 pm
Avatar
Matt
Málaga, Spain
Admin
Forum Posts: 8239
Member Since:
June 13, 2011
sp_UserOfflineSmall Offline

Cheers Keith, it went very nicely indeed. /smile.gif" style="vertical-align:middle" emoid=":)" border="0" alt="smile.gif" /> Here's a few pics:

Attached files

[Image Can Not Be Found] [Image Can Not Be Found] [Image Can Not Be Found] [Image Can Not Be Found] [Image Can Not Be Found] [Image Can Not Be Found] [Image Can Not Be Found]

Cake or death?
April 30, 2010
5:14 pm
Avatar
Plaamoo
Bellingham, Washington U.S.A.
Community Helper
Forum Posts: 1257
Member Since:
March 14, 2009
sp_UserOfflineSmall Offline

Great venture Matt! Beautiful little fish, hope they take to their new home!

April 30, 2010
8:43 pm
Avatar
Matt
Málaga, Spain
Admin
Forum Posts: 8239
Member Since:
June 13, 2011
sp_UserOfflineSmall Offline

Not my venture Jim, I'm just a willing assistant and representative for the S.E.I. It is one of the few things in life that give me genuine satisfaction, though. /smile.gif" style="vertical-align:middle" emoid=":)" border="0" alt="smile.gif" />

Cake or death?
September 6, 2010
7:01 pm
Avatar
Matt
Málaga, Spain
Admin
Forum Posts: 8239
Member Since:
June 13, 2011
sp_UserOfflineSmall Offline

Update: earlier this year some artificial pools were set up behind the scenes at the park to breed Aphanius for reintroduction experiments. Yesterday we went to check on progress and see how one of the populations we released earlier in the summer is getting on.

Trachemys scripta elegans and T. scripta scripta which have been removed by park staff because the native turtle Mauremys leprosa inhabits the park:

[Image Can Not Be Found]

[Image Can Not Be Found]

One of the pools. Three adult pairs of A. iberus were released into each several months ago:

[Image Can Not Be Found]

Some other pools:

[Image Can Not Be Found]

Moorish Gecko, Tarentola mauritanica (I think):

[Image Can Not Be Found]

Roberto checks the only pool where no fish were found - we're still unsure why:

[Image Can Not Be Found]

Manuel and Juan Pablo checking the net:

[Image Can Not Be Found]

Bagging the fish for counting before returning them to the pool. Final count 109 males and 104 females which is brilliant, really:

[Image Can Not Be Found]

[Image Can Not Be Found]

A. iberus pair in the photo tank:

[Image Can Not Be Found]

Palaemonetes sp.?

[Image Can Not Be Found]

Loads and loads of lovely fish!

[Image Can Not Be Found]

Some kind of fly larva:

[Image Can Not Be Found]

The growth rate of the fish was crazy considering the adults were only introduced less than four months ago:

[Image Can Not Be Found]

Attached files

[Image Can Not Be Found] [Image Can Not Be Found] [Image Can Not Be Found] [Image Can Not Be Found] [Image Can Not Be Found] [Image Can Not Be Found] [Image Can Not Be Found] [Image Can Not Be Found] [Image Can Not Be Found] [Image Can Not Be Found] [Image Can Not Be Found] [Image Can Not Be Found] [Image Can Not Be Found] [Image Can Not Be Found]

Cake or death?
September 6, 2010
7:10 pm
Avatar
Matt
Málaga, Spain
Admin
Forum Posts: 8239
Member Since:
June 13, 2011
sp_UserOfflineSmall Offline

Lots of young specimens!

[Image Can Not Be Found]

[Image Can Not Be Found]

Counting...this went on for a while since we collected 298 males and 379 females from one pool! Amazing result from just three females!!!

[Image Can Not Be Found]

[Image Can Not Be Found]

BIG Egyptian Grasshopper, Anacridium aegyptium:

[Image Can Not Be Found]

Gammarid amphipods were swarming in the pools:

[Image Can Not Be Found]

This is Can Camins - one of two localities where captive-bred adult fish were released in June:

[Image Can Not Be Found]

Fry were spotted almost immediately in this marginal section and didn't appear to be Gambusia:

[Image Can Not Be Found]

Then we saw some larger fishes in deeper water so out came the net:

[Image Can Not Be Found]

Subadult male A. iberus which has to have been born and bred here because only adults were released. Groups of similarly-sized specimens could be seen all around the margins and we also caught a few females to check their health. Superb result!!! /biggrin.gif" style="vertical-align:middle" emoid=":D" border="0" alt="biggrin.gif" /> /biggrin.gif" style="vertical-align:middle" emoid=":D" border="0" alt="biggrin.gif" />

[Image Can Not Be Found]

Bad-ass dragonfly larva:

[Image Can Not Be Found]

Attached files

[Image Can Not Be Found] [Image Can Not Be Found] [Image Can Not Be Found] [Image Can Not Be Found] [Image Can Not Be Found] [Image Can Not Be Found] [Image Can Not Be Found] [Image Can Not Be Found] [Image Can Not Be Found] [Image Can Not Be Found] [Image Can Not Be Found]

Cake or death?
September 6, 2010
7:13 pm
Avatar
Bully
South Wales
Veteran
Forum Posts: 249
Member Since:
July 12, 2009
sp_UserOfflineSmall Offline

Great news! /smile.gif" style="vertical-align:middle" emoid=":)" border="0" alt="smile.gif" />

Was the shrimp also introduced or did it find it's way in?

Forum Timezone: Europe/Paris

Most Users Ever Online: 246

Currently Online:
1 Guest(s)

Currently Browsing this Page:
1 Guest(s)

Devices in use: Desktop (1)

Top Posters:

Stefan: 1567

Plaamoo: 1257

mikev: 1134

Malti: 1099

Mark Duffill: 1012

Member Stats:

Guest Posters: 0

Members: 30511

Moderators: 0

Admins: 2

Forum Stats:

Groups: 4

Forums: 10

Topics: 4603

Posts: 36641

Newest Members: dg, Jamieson22, FraziersAquarium, world renowned, granamyr

Administrators: dunc: 1323, Matt: 8239