A few days ago I started underwater surveys about the spatiotemporal distribution of Trachinus draco on the North Aegean Sea. So I'm looking for bibliography about the species.
You can start from here:
http://icesjms.oxfordjournals.org/content/61/6/933.full
and follow the literature.
Ioannis Giovos: "What do you mean why???"
it was related to the reason
P.S. I mean: Your reason...
For a project im working on about the spatial and bathymetric distribution of the species
Euxaristo alexi.... auto to eixa.. epsaxna (an uparxei) kati pio sugkekrimeno
I think it's hard to find useful data since it's not a commercial species thus the incentive to study is quite low... I suppose you are going to be the first, at least in the North Aegean!! Good luck with your work!
Is true.... that there arent lots data due to the fact that is not commercial.. i don't know though if i will be the first one ... lets see .. thank you a lot
What kind of sampling you are planning ? Beach seines, Benthic trawls, Traps, diving ?
Here is a paper about Greater Weever living here in the North (Baltic Sea)
http://icesjms.oxfordjournals.org/content/61/6/933.full.pdf+html
After years of snorkelling in the Argolic gulf I finally spotted one last summer.
I m using the visual cencus on transcect method .... but im interested on every information about the species so.... thanks Philipp
A Google Scholar search gives you several papers about Greater Weever biology.
Try a search for "Trachinus draco ecology", "Trachinus draco biology"
The adress is http://scholar.google.com
Worth mentioning here is that it IS a commercial species, however not very important. The meat is very good and filets are sold at relatively high price, at least in Sweden.
For instance, I found:
Bagge 2004: The biology of the greater weever (Trachinus draco) in the commercial fishery of the Kattegat (ICES J Mar Sci)
Morte et al 1999: Feeding habits of Trachinus draco off the eastern coast of Spain (Western Mediterranean) (Vie et milieu)
And a lot of papers concerning fisheries, weight-length relations, abundance, habitat etc where this species is mentioned.
Hehe, sorry Alexis, I posted exactly the same paper as you..
Ioannis, visual cencus on transcect method means snorkeling along a fixed line ?
I imagine it is quite hard to visually spot them, because they are ambush feeders and buried most of the time. So it might be not a bad idea to conduct also a beach seine sampling along the same transect to have a comparison between visual and real abundances.
I found "my" Weever when snorkelling at night using a strong lamp. Their eyes reflect and they are easier to detect.
Good luck !
Hi philipp,
i m snorkelling cause the aim is to investigate the bathymetric distribution of the species so i m scuba diving. Also i never use distructive methods for sampling.
is not so hard to detect them by scuba diving especially when you are sliding just above the bottom.
Thank you a lot though!!!
Ioannis Giovos: "the aim is to investigate the bathymetric distribution of the species so i m scuba diving"
actually, it was obvious the method, due to the fact that You have mentioned / described it in a previous posting
I really don't know if the scuba diving is worthwhile to be considered for standardizing as research method... because on this logic (just as example) You can consider grand-slam ski tournaments as method for rapid assessment of birds from mountains with slopes steep enough to organize Winter Olympics...
Dear Zsolt: You are right, there are some downfalls when doing Scuba surveys. But there are standardized methods available which give you good & reproducible results. As Libej stated in 2003: "Today, the visual census technique has proved to be one of the most efficient methods to assess the abundance and diversity of coastal fish assemblages (Harmelin, 1987; Harmelin-Vivien & Francour, 1992; Francour, 1994)".
I am a huge supporter of Scuba surveys and do them myself when investigating spawning sites of atlantic herring. They are cost efficient, are non destructive and have high spatial resolution.
hello Ioannis Giovos, I have been searching for some papers about Trachinus draco. I have post all the article in this archive folder.
I wish you have a nice research !
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