We've got a couple so far this year in the Willamette river, full freshwater. Well over 50 miles from the ocean. Smaller specimens though. Just wondering if anyone has kept them in freshwater long term?
Anyone ever keep starry flounder?
- Thread starter Modest_Man
- Start date
I believe they require a higher salinity as they get older.
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Yeah, obviously. I've cared for some larger ones in a 4k cold water saltwater tank. Just can't find much out about how they do in fresh, what salinity they require and what size they need full marine.
Here's another species we caught today that was new to me - an invasive amur goby.
Here's another species we caught today that was new to me - an invasive amur goby.
From research, it appears that brackish salinity is a minimum requirement. It appears as if they only pass through rivers from the current of the ocean to carry them to an estuary. That being said, I think that if they are raised from very small in full freshwater that they would be fine.
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I had a nice reply typed up and Firefox crashed. Here's the gist.
http://onlinelibrary.wiley.com.ezpr....edu/doi/10.1111/j.1095-8649.2007.01424.x/pdf
In particular in starry flounder, survival rates in FW increased dramatically within 4 days from 20 to 24 DAH of the settlement metamorphosis phase, and the high survival rate continued in the juvenile and immature stages. These results suggest that the period from 20 to 24 DAH is the critical phase of completing settlement during the low salinity toler- ance which rapidly develops. In starry flounder and hybrids, the relationships between M and LS were not different in FW and in SW over 10 days after transfer. This result indicated that the growth in FW and SW did not differ markedly after transfer, so the FW environment is suggested not to be maladaptive to starry flounder and hybrids after their settlement. Starry flounder and hybrids might be able to fully adapt to FW in the juvenile and immature stages, although only limited data were available. Stone flounder also did not indicate a difference in the immature period, but this was thought to be because of short time period of only 3 days. Additionally, immature starry flounder did not show any mortality in FW, whereas immature stone flounder all died. These results suggest that substantial differences occur between starry flounder and stone flounder; starry flounder develop their low salinity tolerance during the settlement phase similar to other flatfishes but only starry flounder can adapt to FW soon after settlement, and this trait was also inherited by the hybrids.
Since the time of its discovery Platichthys stellatus has been recognized as a euryhaline organism. Pallas, in his descriptions, mentioned that it occurs often around the mouths of previous hit rivers next hit, streams, and small brooks flowing into the ocean, and in bays and the more clam recesses of the sea. Later work has provided ample proof of its occurence in strictly fresh previous hit river next hit waters many miles from the sea as well as in the truly oceanic waters off the open coast. Gunter (1942) reports that the starry flounder has been taken 75 miles upstream in the Columbia previous hit River next hit. Such extensive penetration inland may be somewhat unusual but that the occupation of the fresh-water habitat is by no means abnormal is clearly shown by recent results obtained incidentally by the United States Fish and Wild-life Service, while studying the movements of young, seaward-migrating chinook salmon and striped bass. During the course of that investigation in 1947 fyke nets were fished just below the surface of the water one-half mile below the Antioch Bridge in the San Joaquin previous hit River next hit and six miles downstream from Rio Vista in the Sacramento previous hit River next hit. Although the collecting nets were not designed or set for the capture of bottom fishes, they took, in addition to the salmon and striped bass, 80 starry flounder in the San Joaquin previous hit River next hit. At Antioch the salinity varied from about 0.06 to 9.0 parts per thousand during the period from April through September, in which the flounder were caught; a variation from fresh water to brackish water having a salinity about one-quarter that of the ocean. At Rio Vista the salinity varied from 0.02 to 0.5 parts per thousand and the Sacramento previous hit River next hit water could be considered nothing but fresh during the entire period of the experiment. Nevertheless 193 starry flounder were caught at the latter station. It should be noted that all the flounder taken in these two previous hit rivers next hit ranged from 19 to 101 mm. in length. No large fish were taken, but in all probability this is not due to any difference in tolerance to fresh water between the various age groups but to the tendency of larger fish to frequent greater depths than occur in the previous hit rivers next hit and the possibility of larger fish avoiding the fyke nets.
http://content.cdlib.org/view?docId....depth=1&toc.id=&brand=calisphere&query=river
http://onlinelibrary.wiley.com.ezpr....edu/doi/10.1111/j.1095-8649.2007.01424.x/pdf
In particular in starry flounder, survival rates in FW increased dramatically within 4 days from 20 to 24 DAH of the settlement metamorphosis phase, and the high survival rate continued in the juvenile and immature stages. These results suggest that the period from 20 to 24 DAH is the critical phase of completing settlement during the low salinity toler- ance which rapidly develops. In starry flounder and hybrids, the relationships between M and LS were not different in FW and in SW over 10 days after transfer. This result indicated that the growth in FW and SW did not differ markedly after transfer, so the FW environment is suggested not to be maladaptive to starry flounder and hybrids after their settlement. Starry flounder and hybrids might be able to fully adapt to FW in the juvenile and immature stages, although only limited data were available. Stone flounder also did not indicate a difference in the immature period, but this was thought to be because of short time period of only 3 days. Additionally, immature starry flounder did not show any mortality in FW, whereas immature stone flounder all died. These results suggest that substantial differences occur between starry flounder and stone flounder; starry flounder develop their low salinity tolerance during the settlement phase similar to other flatfishes but only starry flounder can adapt to FW soon after settlement, and this trait was also inherited by the hybrids.
Since the time of its discovery Platichthys stellatus has been recognized as a euryhaline organism. Pallas, in his descriptions, mentioned that it occurs often around the mouths of previous hit rivers next hit, streams, and small brooks flowing into the ocean, and in bays and the more clam recesses of the sea. Later work has provided ample proof of its occurence in strictly fresh previous hit river next hit waters many miles from the sea as well as in the truly oceanic waters off the open coast. Gunter (1942) reports that the starry flounder has been taken 75 miles upstream in the Columbia previous hit River next hit. Such extensive penetration inland may be somewhat unusual but that the occupation of the fresh-water habitat is by no means abnormal is clearly shown by recent results obtained incidentally by the United States Fish and Wild-life Service, while studying the movements of young, seaward-migrating chinook salmon and striped bass. During the course of that investigation in 1947 fyke nets were fished just below the surface of the water one-half mile below the Antioch Bridge in the San Joaquin previous hit River next hit and six miles downstream from Rio Vista in the Sacramento previous hit River next hit. Although the collecting nets were not designed or set for the capture of bottom fishes, they took, in addition to the salmon and striped bass, 80 starry flounder in the San Joaquin previous hit River next hit. At Antioch the salinity varied from about 0.06 to 9.0 parts per thousand during the period from April through September, in which the flounder were caught; a variation from fresh water to brackish water having a salinity about one-quarter that of the ocean. At Rio Vista the salinity varied from 0.02 to 0.5 parts per thousand and the Sacramento previous hit River next hit water could be considered nothing but fresh during the entire period of the experiment. Nevertheless 193 starry flounder were caught at the latter station. It should be noted that all the flounder taken in these two previous hit rivers next hit ranged from 19 to 101 mm. in length. No large fish were taken, but in all probability this is not due to any difference in tolerance to fresh water between the various age groups but to the tendency of larger fish to frequent greater depths than occur in the previous hit rivers next hit and the possibility of larger fish avoiding the fyke nets.
http://content.cdlib.org/view?docId....depth=1&toc.id=&brand=calisphere&query=river
I've done some reading about Starry Flounder and am too convinced they can live in freshwater their entire lives if slowly acclimated to low to no salinity levels.
There have been studies with Bull Sharks being able to adjust their salinity levels internally, if researchers were to cut open a Starry Flounder I believe they too would have a similar internal organ structure.
But who knows, that's my .02
There have been studies with Bull Sharks being able to adjust their salinity levels internally, if researchers were to cut open a Starry Flounder I believe they too would have a similar internal organ structure.
But who knows, that's my .02