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
Aphanius baeticus in Cádiz
January 19, 2015
8:54 pm
Avatar
Matt
Málaga, Spain
Admin
Forum Posts: 8239
Member Since:
June 13, 2011
sp_UserOfflineSmall Offline

We popped down to Cádiz for a visit just before xmas and on the way stopped at a couple of localities where Stefan and I had collected A. baeticus in 2011. I was particularly interested to see the difference between the habitats in summer (previous visit was in August) and winter. They consist of a series of small streams which all drain an interesting outcrop containing significant salt deposits, meaning some of them are hypersaline whereas others contain more-or-less freshwater.

There had been a lot of rain the preceding few days; water levels were high and it was extremely muddy underfoot. At the first place only a single, miserable-looking Gambusia holbrooki was collected and we quickly moved on.

001.jpgImage Enlarger

 Same spot in 2011:

2011-1.jpgImage Enlarger

Couldn't even get down to the water at the second place due to mud:

muddy.jpgImage Enlarger

Same place in 2011, taken standing at the top right of the previous pic:

not-muddy.jpgImage Enlarger

So, no fish so far but not entirely unexpected given the time of year and weather. The next locality, which is the most saline of the streams and thus the only one not to contain Gambusia, also contained far more water than in 2011 and appeared to have been modified by machinery (?).

003.jpgImage Enlarger

Same spot in 2011:

lesswatrer.jpgImage Enlarger

In 2011 it was too hot to walk much, but this time I followed the channel downstream until it basically disappeared after a couple of hundred metres. No fish were observed on this side of the road bridge:

004.jpgImage Enlarger

 005.jpgImage Enlarger

 On the other side of the bridge there were again signs of artificial modification:

006.jpgImage Enlarger

007.jpgImage Enlarger

Same two spots in 2011, when the fish were all concentrated in small pools under and adjacent to the road bridge:

2011-2.jpgImage Enlarger

 2011-3.jpgImage Enlarger

 This time, the fish could be found in deeper sections with submerged vegetation, like this one:

008.jpgImage Enlarger

Walked upstream for a few hundred metres, until I stopped seeing fish and the going got too wet underfoot. It seems that the stream floods during wet periods and forms a nice temporary, saline marshland.

009.jpgImage Enlarger

 010.jpgImage Enlarger

 011.jpgImage Enlarger

 012.jpgImage Enlarger

 013.jpgImage Enlarger

 Conehead mantis - Empusa pennata. Also some nice birds on this stream, and no other people!

mantid.jpgImage Enlarger

Moved back to the stretch near the road where I had first seen fish and netted a few for pics. They are very easy to catch here.

015.jpgImage Enlarger

016.jpgImage Enlarger

 017.jpgImage Enlarger

 018.jpgImage Enlarger

 019.jpgImage Enlarger

In summation, the habitats looked more-or-less as expected, but signs of modification near the road are not positive. The three streams are artificially united into a single concrete canal around a kilometer further downstream, and as far as I can tell this contains no native fishes. This means the Aphanius are probably restricted to reaches of around 2-3 km in the case of the first two habitats, which are heavily infested with Gambusia, and perhaps a few hundred metres in the third.

Cake or death?
January 19, 2015
11:13 pm
Avatar
Plaamoo
Bellingham, Washington U.S.A.
Community Helper
Forum Posts: 1257
Member Since:
March 14, 2009
sp_UserOfflineSmall Offline

Thanks Matt. Doesn't sound good. Great to have you back!

January 20, 2015
12:14 am
Avatar
Matt
Málaga, Spain
Admin
Forum Posts: 8239
Member Since:
June 13, 2011
sp_UserOfflineSmall Offline

Hehe cheers Jim, never really went away! The saddest thing here might be that A. baeticus is protected under national and international law therefore it's highly illegal to possess it, yet genuine protection of 8 of its 9 remaining habitats, which are also extremely precious for birds and amphibians in particular, is nonexistent.Laugh

Cake or death?
January 24, 2015
7:53 pm
Avatar
oaken
Veteran
Forum Posts: 629
Member Since:
September 15, 2008
sp_UserOfflineSmall Offline

Great report Matt! Good to see they're still there at least.

January 27, 2015
11:02 am
Avatar
Matt
Málaga, Spain
Admin
Forum Posts: 8239
Member Since:
June 13, 2011
sp_UserOfflineSmall Offline

Cheers Gustav, agreed!

Cake or death?
January 31, 2015
11:57 am
Avatar
Jemp
New Member
Forum Posts: 2
Member Since:
January 31, 2015
sp_UserOfflineSmall Offline

Hola buen reportaje, a mi entendre Es importante Proteger del tanto el pez Como SUS hábitat, heno idea Una Importante que quiero compartir y no se como lo veras. Solo pueden Reproducir y reintroducir los Organismos Oficiales Que se dedican a su conservacion Pero si dejaran controladamente claro, Que los amantes de los peces pudieran colaborar en Reproducir y mantener en acuarios, balsas ...  seria mas rapida su recuperacion.

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: 30520

Moderators: 0

Admins: 2

Forum Stats:

Groups: 4

Forums: 10

Topics: 4603

Posts: 36641

Newest Members: datfish, wong123, Kevin20359, troides, noos

Administrators: dunc: 1323, Matt: 8239