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Glasseye Snapper

Member Since 11 Oct 2005
Offline Last Active Yesterday, 04:20 PM

Posts I've Made

In Topic: Damselfish on reef crest

25 March 2015 - 04:11 PM

Hi Mark,


I don't have a firm answer but it reminds me of Stegasted obreptus (Western Gregory), which has similar shape, dark edges on scales, yellow edging on start of dorsal, and a blue edging on the ventral fins. It has a prominent black spot below the yellow edging of the dorsal and it does not have the pale coloration towards the back. It is found shallow, 2-10m, but I don't think it is found as far East as Fiji so perhaps yours is a closely related sister species.


I am looking forward to find out the answer.



In Topic: Geotagging and depth in pictures' EXIF data

18 March 2015 - 04:42 PM

I plan to do this for my next dive trip using the reefnet sensus ultra to log depth and temperature. It does not log a wall-clock time but once you synchronize it with the first image of a dive, which I take upon start of descent, then you can extract the depth for each subsequent image. There is no software for this as far as I know but I plan to write it myself. I haven't decided on whether to write it into exif or in a separate "annotation file" as I also plan to register the species names for all fish in the images and habitat information.



In Topic: Red Sea "Rhinoceros" blenny

09 March 2015 - 02:01 PM

As one who struggles to memorize names, I prefer descriptive nomenclature. But nothing will happen until someone catches a few of them for morphological and DNA analysis. I think that would involve using some kind of chemical sedative to get them out of their tubes. Not sure if I'm up for that and it would probably need special export paperwork. Better to find some areas where they can be reliably found and then leave it up to the scientists.



In Topic: Red Sea "Rhinoceros" blenny

06 March 2015 - 02:54 PM

Thanks Alex.


This is almost certainly a new species and my gut feeling was also that it is a blenny rather than a goby. But the single horn/cirrus is very unusual for either family. To me, and also Chris, it in particular resembles Caribbean tube blennies. But according to fish base and the experts not a single member of the tube-blennies (Chaenopsidae family) is known from the Pacific. So if this ends up being such a blenny it will be a big surprise. I expect to be in either Safaga or Marsa Shagra in May and now have a good idea in what types of habitat to look for them.


Cheers,  Bart

In Topic: Red Sea "Rhinoceros" blenny

05 March 2015 - 05:14 PM

By chance, I was just talking about this fish today with Sergey Bogorodski, an expert in Red Sea fish who is keen on finding out more about this fish (they will release a new Red Sea fish diversity book which I hope will be as good as the Reef Fishes of the East Indies trifecta). I will let him know about this second sighting. Alex can you say anything more about the dive site. The one I found was in the Marsa Alam area, Marsa Shagra, in about 2m depth. Its tube hole was in a dead limestone block facing the sandy chute leading from the beach out through the reef. I will be back in the Red Sea this May and would love to see and study it better.