gymnothorax polyuranodon

[Fishysweet]

Awww they are so cute tank looks good bet they love all the hideing places

 

[UnstoppableJayD]

Masone.... any updates on info?

 

[masone]

pH ranges from 6.8 to 7.2
GH 1
KH 1
I was talking to Ebner on Friday night, he hasn't done the otoliths but he was at a conference the other week and met some other scientists have. I had a read of their paper, eels appear to be living in fresh and brackish only. The eels they used for the study were only fairly small though. Brendan has otoliths from much bigger specimens so will be interesting to see how his results compare.

 

[Charney]

pH ranges from 6.8 to 7.2
GH 1
KH 1
I was talking to Ebner on Friday night, he hasn't done the otoliths but he was at a conference the other week and met some other scientists have. I had a read of their paper, eels appear to be living in fresh and brackish only. The eels they used for the study were only fairly small though. Brendan has otoliths from much bigger specimens so will be interesting to see how his results compare.

Great. Thanks for posting that info

 

[Charney]

I was talking to Ebner on Friday night, he hasn't done the otoliths but he was at a conference the other week and met some other scientists have. I had a read of their paper, eels appear to be living in fresh and brackish only. The eels they used for the study were only fairly small though. Brendan has otoliths from much bigger specimens so will be interesting to see how his results compare.

So were any of the eels purely fw?

 

[UnstoppableJayD]

So were any of the eels purely fw?

he said that in earlier posts as well as implying they were found in both fresh and brackish but no salt in this quote.

 

[Charney]

he said that in earlier posts as well as implying they were found in both fresh and brackish but no salt in this quote.

I am aware of that, but that was not my question and we kind of already knew that. My question is on analyzing the otoliths where any purely freshwater without venturing into a brackish habitat?

 

[masone]

I will read it again tomor but I think it was concluded that the eels can utilise both environments. It was noted that all the eels from the study were captured in fresh. This also supports Brendan's first paper, very few eels were documented in brackish environments and the smallest eel was one of those. Given the life history of other eels and many fish that inhabit the same creeks as these I think it would be safe to say the eels at least spend the first stages if their lives in brackish water and move to fresh. They may still move between the two on occasion such as for spawning but from personal experience I have only ever seen them in fresh and have seen them move upstream in lower freshwater environments to get away from the salt wedge from high tides.

 

[Charney]

I will read it again tomor but I think it was concluded that the eels can utilise both environments. It was noted that all the eels from the study were captured in fresh. This also supports Brendan's first paper, very few eels were documented in brackish environments and the smallest eel was one of those. Given the life history of other eels and many fish that inhabit the same creeks as these I think it would be safe to say the eels at least spend the first stages if their lives in brackish water and move to fresh. They may still move between the two on occasion such as for spawning but from personal experience I have only ever seen them in fresh and have seen them move upstream in lower freshwater environments to get away from the salt wedge from high tides.

cool thanks

 

[CairnsLocal]

Nice looking eels. Thought you might like this pic taken in Chinamens Creek last year (saltwater). Two of these eels apparently breeding. I passed this and other pics to Brendan for his research.

cheers,

Steve