Second trip to Morocco (August 2009)

First trip to Morocco was last year (here & here). During the second field trip two more sampling sites were added, a few more locations checked were troutless. Participants were Aleš, Saša, Johnnes & daughter. For more pictures click here.

ADDED: Just received a note from Aleš. This trip was actually the third expedition to Morocco. The first was already in June 2006, predating this blog. The participants at that time were Johannes with his daughter, Aleš with his wife and Said of the University Cadi Ayyad.

Softmouth trout from Vrljika

Several field trips and a lot of work was done near Imotski in Croatia. Softmouth trout was perhaps the most interesting fish from that area. Aleš has published a paper in Športski ribolov (Sport Fishing), presenting genetic results to the wider public. Special thanks to Daliborka Dušanić for translation to Croatian.

Another myth busted?

In the past year, BTRG has performed a comprehensive genetic analysis of dentex trout from the River Neretva. This time we applied an extended set of molecular markers and included for comparison several specimens of "real glavatica" (i.e., marmorated trout from the Neretva), which were badly missing in our preliminary study.

Contrary to our previous hypothesis, dentex trout turned out as genetically indistinct from marmorated trout of the Neretva. We assume that a phenotype characteristic of dentex trout had probably evolved as a consequence of specific local adaptation.

For more information, see the summary of already submitted manuscript below.

The dentex samples were provided by prof. Branko Glamuzina (University of Dubrovnik) and prof. Ivan Bogut (University of Osijek), and the "glavatica" samples by Naris Pojskić (Institute for Genetic Engineering and Biotechnology).

Summary

The Balkan Peninsula is home to the most diverse collection of salmonids in the world. Nevertheless, many taxonomic uncertainties remain unresolved despite over a century of studies. Conservation of Balkan salmonid biodiversity hinges in large part upon addressing such uncertainties and is therefore of paramount importance. A notable example is found in the enigmatic Salmo dentex, which has been described by various authors in discontinuous populations ranging from the Aoos river in Greece to the Krka river drainage in Croatia. Current reports suggest it has disappeared from much of its previous range. At present, several contradictory opinions predominate on the taxonomic status of S. dentex without any broad consensus. To help resolve this issue we performed a rigorous molecular genetic analysis using a robust array of mtDNA, microsatellite, and nuclear gene markers of so-called S. dentex of the lower Neretva river drainage alongside other co-inhabiting endemic salmonids (i.e. S. obtusirostris, S. marmoratus, S. trutta). Our results clearly showed three genetically distinct lineages of salmonids with S. dentex being phenotypically distinct yet genetically indistinct from S. marmoratus of the lower Neretva. Based on our results and previous molecular results on Montenegrin dentex, it is clear that S. dentex is not a monophyletic lineage and should not be considered a distinct species on a genetic basis. We hypothesize S. dentex to most likely be polyphyletic assemblage of fish sharing a similar life history and unified phenotype evolved as a consequence of specific local adaptation.

Introducing Klavdija

Klavdija Bogataj is an undergraduate student of animal science and is currently preparing her graduation thesis "Genetic analysis of autochthonous brown trout (Salmo trutta) in Slovenija and identification of genetically pure populations" (working title).

Her practical working experience as a part of animal science curriculum at the Angling Club of Tržič was followed by sampling expedition with the Fisheries Research Institute of Slovenia. After realising that sampled fish are studied by Aleš Snoj she asked him for a graduation thesis mentorship. At the end, Simona Sušnik became her mentor. Klavdija started to work in the laboratory in October 2008 both for her thesis and the autochthonous brown trout project. As the later is done under a scheme similar to summer work she will probably be one of the few people actually working in the lab during the summer.

Spring

Meteorological spring started on 1st of March, astronomical on 20th of March. At the Dept. of Animal Science, 2 events mark the begining of spring.

Introducing John

John Zablocki is a recent graduate in Chemistry and Spanish from the University of Montana. He came to Slovenia this September on a Fulbright grant for his project titled "Characterization and conservation of endangered Balkan trout". His first several months in Slovenia were spent working in the Marble Trout Restoration Program in Western Slovenia with the Tolmin Angling Association (Ribiška družina Tolmin). In January he moved from Tolmin to join our lab and is currently working on a project to possibly identify a remaining pure population of Marble trout that were thought to have gone extinct.

He is obsessed with trout, language, fly fishing, and conservation. He plans to continue working in the Balkans to help protect its unique and fragile salmonid biodiversity.

Vrljika field trip, March 09

In a frame of collaboration with prof. dr. Ivan Bogut from Osijek University, Mr. Ante Mikulić, a representative of Angling club Proložac and our old friend Dušan Jesenšek from RD Tolmin, BTRG organized another field trip to Imotsko polje, in the first place to sample minnows. We were again accompanied with a photographer Arne Hodalič and also with his friend Matej Mihailovski; they were mostly interested in taking photos of the Vrljika softmouth trout and Red Lake scenery.

It was also our intention to meet Manu Esteve and John Zablocki there, who were in the mean time trying hard to film spawning behaviour of the softmouth trout in the neighbouring Neretva River. Unfortunately, we somehow didn’t make it and we are now trying to organize this meeting in Slovenia, were Manu is currently making a stay waiting for Hucho spawning.