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Aphanius baeticus in Cádiz

Home Forums Field Trips & Conservation Aphanius baeticus in Cádiz

This topic contains 0 replies, has 1 voice, and was last updated by  Jemp 2 years, 9 months ago.

Viewing 6 posts - 1 through 6 (of 6 total)
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  • #303506

    Matt
    Keymaster

    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.

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     Same spot in 2011:

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

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

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    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 (?).

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    Same spot in 2011:

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    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:

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

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

    2011-2.jpg

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

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    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.

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

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    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.

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    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.

    #354016

    Plaamoo
    Participant

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

    #354018

    Matt
    Keymaster

    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

    #354039

    oaken
    Participant

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

    #354052

    Matt
    Keymaster

    Cheers Gustav, agreed!

    #354078

    Jemp
    Participant

    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.

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