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Providing evidence to improve practice

Action: Exclude fish with barriers Amphibian Conservation

Key messages

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  • One controlled study in Mexico found that excluding fish using a barrier increased weight gain of axolotls.


Supporting evidence from individual studies


A controlled study in 2009 of a canal within agricultural land in Xochimilco, Mexico (Valiente et al. 2010) found that filters to exclude competitive fish and improve water quality resulted in increased weight gain in axolotls Ambystoma mexicanum. Only four of 12 previously marked axolotls were recaptured; however, their weight had increased by 16%. Weight gain was greater than that of axolotls in control colonies over the same period. Farmers traditionally created canals linking lakes and wetlands. Working with farmers in 2009, one canal used as a refuge by axolotls was isolated from the main system using filters made of wood to exclude fish and improve water quality.


Referenced papers

Please cite as:

Smith, R.K., Meredith, H. & Sutherland, W.J. (2019) Amphibian Conservation. Pages 9-65 in: W.J. Sutherland, L.V. Dicks, N. Ockendon, S.O. Petrovan & R.K. Smith (eds) What Works in Conservation 2019. Open Book Publishers, Cambridge, UK.