gymnothroax polyurandon

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SawickiB

SawickiB

Jack Dempsey
MFK Member
Feb 22, 2014
400
7
33
FL, United States
Cant find any write ups on these guys, im getting 2 very soon from wes at rare fish, and id like to know as much as possible about them thanks! Ill make sure to get some photos to!
 
Thank you wes! This is my 15" eel, i was a bit worried about him at first, seemed a bit stressed but i think its calming down.










This is the 12" eel


 
I plan on keeping in all FW, but im talking to someone about keeping it in brackish or not.
 
Thanks, i think they were just a bit stressed because they seem to be doing much better now. :D
 
I am quite envious! I stumbled upon these eels recently and fell in love! One article I read compared strontium and calcium levels to determine that they can spend their lives in freshwater and be just fine...and suggests that this particular eel is not a marine eel at all and should therefore not require brackish water. At least, that's what I understand.
Here is the quoted abstract for your reading:
"Freshwater eels of the Anguillidae are diadromous because they migrate between ocean and freshwater environments, but other anguilliform fishes are generally considered to be strictly marine species. A few marine eels of the Muraenidae and Ophichthidae have occasionally been found in freshwater or estuaries, indicating that anguillids are not the only anguilliform eels that can use freshwater in some parts of the world. The moray eel Gymnothorax polyuranodon is one species that is known to be present in freshwater in the Indo-Pacific, but its life history is unknown. One way to evaluate what types of habitats are used by fishes is to determine the ratio of strontium (Sr) to calcium (Ca) in their otoliths, because this can show if they have used freshwater or saltwater environments. To evaluate the patterns of freshwater use by this unusual species of marine eel, the otolith Sr/Ca ratios of fourG. polyuranodon (275–344 mm) caught in a freshwater stream of Fiji were analyzed. The consistently low Sr/Ca values (0–4) indicated upstream movement after settlement and freshwater or estuarine residence of all four individuals. These eels did not appear to have entered freshwater just for a short time period, which is consistent with other reports that this species is present in estuarine and freshwater habitats. This suggests that G. polyuranodon may be a catadromous species of marine eel. The similarities and differences between the life histories of anguillid eels and the few marine eels that have evolved the ability to invade freshwater habitats is discussed in relation to the evolutionary origin of diadromy in anguilliform fishes that originated in the marine environment."
 
SawickiB said:
I plan on keeping in all FW, but im talking to someone about keeping it in brackish or not.
Click to expand...

Same here, although I am not checking my salt param, i do add a little salt to my setup with Fiji gold. Also got whiptails n altums so my addings cant be that bad since I see no effects on tank mates atm.
Nice pick up!



Grizzlor said:
I am quite envious! I stumbled upon these eels recently and fell in love! One article I read compared strontium and calcium levels to determine that they can spend their lives in freshwater and be just fine...and suggests that this particular eel is not a marine eel at all and should therefore not require brackish water. At least, that's what I understand.
Here is the quoted abstract for your reading:
"Freshwater eels of the Anguillidae are diadromous because they migrate between ocean and freshwater environments, but other anguilliform fishes are generally considered to be strictly marine species. A few marine eels of the Muraenidae and Ophichthidae have occasionally been found in freshwater or estuaries, indicating that anguillids are not the only anguilliform eels that can use freshwater in some parts of the world. The moray eel Gymnothorax polyuranodon is one species that is known to be present in freshwater in the Indo-Pacific, but its life history is unknown. One way to evaluate what types of habitats are used by fishes is to determine the ratio of strontium (Sr) to calcium (Ca) in their otoliths, because this can show if they have used freshwater or saltwater environments. To evaluate the patterns of freshwater use by this unusual species of marine eel, the otolith Sr/Ca ratios of fourG. polyuranodon (275–344 mm) caught in a freshwater stream of Fiji were analyzed. The consistently low Sr/Ca values (0–4) indicated upstream movement after settlement and freshwater or estuarine residence of all four individuals. These eels did not appear to have entered freshwater just for a short time period, which is consistent with other reports that this species is present in estuarine and freshwater habitats. This suggests that G. polyuranodon may be a catadromous species of marine eel. The similarities and differences between the life histories of anguillid eels and the few marine eels that have evolved the ability to invade freshwater habitats is discussed in relation to the evolutionary origin of diadromy in anguilliform fishes that originated in the marine environment."
Click to expand...

Nice info



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Grizzlor said:
I am quite envious! I stumbled upon these eels recently and fell in love! One article I read compared strontium and calcium levels to determine that they can spend their lives in freshwater and be just fine...and suggests that this particular eel is not a marine eel at all and should therefore not require brackish water. At least, that's what I understand.
Here is the quoted abstract for your reading:
"Freshwater eels of the Anguillidae are diadromous because they migrate between ocean and freshwater environments, but other anguilliform fishes are generally considered to be strictly marine species. A few marine eels of the Muraenidae and Ophichthidae have occasionally been found in freshwater or estuaries, indicating that anguillids are not the only anguilliform eels that can use freshwater in some parts of the world. The moray eel Gymnothorax polyuranodon is one species that is known to be present in freshwater in the Indo-Pacific, but its life history is unknown. One way to evaluate what types of habitats are used by fishes is to determine the ratio of strontium (Sr) to calcium (Ca) in their otoliths, because this can show if they have used freshwater or saltwater environments. To evaluate the patterns of freshwater use by this unusual species of marine eel, the otolith Sr/Ca ratios of fourG. polyuranodon (275–344 mm) caught in a freshwater stream of Fiji were analyzed. The consistently low Sr/Ca values (0–4) indicated upstream movement after settlement and freshwater or estuarine residence of all four individuals. These eels did not appear to have entered freshwater just for a short time period, which is consistent with other reports that this species is present in estuarine and freshwater habitats. This suggests that G. polyuranodon may be a catadromous species of marine eel. The similarities and differences between the life histories of anguillid eels and the few marine eels that have evolved the ability to invade freshwater habitats is discussed in relation to the evolutionary origin of diadromy in anguilliform fishes that originated in the marine environment."
Click to expand...

can you tell me the title and what journal that is from? I would like to get the full article. Thanks
 
Thanks guys for the info, ill add some salt, it will be a few days before my fiji gold comes in though.
 
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