My Silver Dollar Sp's
- Thread starter fishguy1978
- Start date
Many thanks!!!
Your fish are gorgeous!
Yes, I do think some of those females are altidorsalis, but not all. Your last picture, for instance, I think it is altidoralis, but am not certain; if it isn't, I don't know what species name (out of 14 possible) to use for her. Certainly a Metynnis, but which if not altidorsalis?
In the clip below, from one of your pictures, I think 2 females of 2 different species are shown-
The one of the left may be the same fish as in your last picture?
Note the shape of the dorsal fin on those 2 fish. To me, they look like two different species. The shape of the fin is different, and the black maculations n the large fish are not present on the smaller fish. The shape of the fish themselves is different, but sometimes that is due to development or individual differences; the dorsal fins, however... different in my mind.
Very, very, nice. Thanks!!!
Your fish are gorgeous!
Yes, I do think some of those females are altidorsalis, but not all. Your last picture, for instance, I think it is altidoralis, but am not certain; if it isn't, I don't know what species name (out of 14 possible) to use for her. Certainly a Metynnis, but which if not altidorsalis?
In the clip below, from one of your pictures, I think 2 females of 2 different species are shown-
The one of the left may be the same fish as in your last picture?
Note the shape of the dorsal fin on those 2 fish. To me, they look like two different species. The shape of the fin is different, and the black maculations n the large fish are not present on the smaller fish. The shape of the fish themselves is different, but sometimes that is due to development or individual differences; the dorsal fins, however... different in my mind.
Very, very, nice. Thanks!!!
F
FJB
, from our earliest conversation we determined that I do have at least 3 species:
1. M. Lippincotainus, or derpy faced spotted. 4 of these total
2. M. Argentus, dinner plate body with spotted dorsal. I think 3 of these
3. M. Hypsauchen: these are in the 120g. 6 of these.
Uncertain fish Id housed in the 220g.
There are 2 with no spotting or very faint spotting on the body and no spots on the dorsal. One has a black spot on the left side of its face. Posts #81 and #82
There are 2 that have a red blush to the area just below the gill plates. Similar looking to a RBP. Post #77
Post #83 I believe is M. Argentus
1. M. Lippincotainus, or derpy faced spotted. 4 of these total
2. M. Argentus, dinner plate body with spotted dorsal. I think 3 of these
3. M. Hypsauchen: these are in the 120g. 6 of these.
Uncertain fish Id housed in the 220g.
There are 2 with no spotting or very faint spotting on the body and no spots on the dorsal. One has a black spot on the left side of its face. Posts #81 and #82
There are 2 that have a red blush to the area just below the gill plates. Similar looking to a RBP. Post #77
Post #83 I believe is M. Argentus
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You have a very nice group.
It is not easy to tell apart the various species, except for the extremes (i.e., say lippincotianus versus hypsauchen). And then on top of that there are the synonymies. The name "M. argenteus" has been applied to a number of SD forms, both in the popular and in the scientific literature. Upon examination of the type material of M. argenteus (work by the recognized expert on Metynnis, Dr. R. Ota) , it has been shown that this is a junior synonym of M. altidorsalis. But there are fish that have been referred to 'argenteus. that are not one nor the other. It isn't easy, particularly when not knowing where they come from, which is by far the almost universal case of the aquarium hobby world of silver dollars.
Again, very nice fish and they look very healthy! Thanks.
It is not easy to tell apart the various species, except for the extremes (i.e., say lippincotianus versus hypsauchen). And then on top of that there are the synonymies. The name "M. argenteus" has been applied to a number of SD forms, both in the popular and in the scientific literature. Upon examination of the type material of M. argenteus (work by the recognized expert on Metynnis, Dr. R. Ota) , it has been shown that this is a junior synonym of M. altidorsalis. But there are fish that have been referred to 'argenteus. that are not one nor the other. It isn't easy, particularly when not knowing where they come from, which is by far the almost universal case of the aquarium hobby world of silver dollars.
Again, very nice fish and they look very healthy! Thanks.
I love keeping fish and this really makes me laugh. We try to be "serious" fish keepers and try to determine the Latin names for the species we keep. Along comes the hobby indiscriminately throwing names at fish that look similar mudding up the waters. Laughing at the frustrations aside this is very interesting. I will have to google Dr. Ota.
Beautiful!
Mines have also been quite horny in the last days. I think it is the low atmospheric pressure associated with the storms since Sunday.
Below, one of my male Metynnis maculatus. This fish is 22 years old.
Despite much similarity with your male M. altidorsalis, the shape of the las rays of the anal fin, is a dead giveaway of two different Metynnis species. In addition, M. altidorsalis is not a 'spotted silver dollar' in the strict sense, whereas M. maculatus is. On the other hand, the spots on maculatus are much smaller than in M. lippincotianus, despite the age of the fish compared.
Thanks for sharing. Cool stuff and beautiful fish!
Mines have also been quite horny in the last days. I think it is the low atmospheric pressure associated with the storms since Sunday.
Below, one of my male Metynnis maculatus. This fish is 22 years old.
Despite much similarity with your male M. altidorsalis, the shape of the las rays of the anal fin, is a dead giveaway of two different Metynnis species. In addition, M. altidorsalis is not a 'spotted silver dollar' in the strict sense, whereas M. maculatus is. On the other hand, the spots on maculatus are much smaller than in M. lippincotianus, despite the age of the fish compared.
Thanks for sharing. Cool stuff and beautiful fish!
