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I've had this guy for a little over a year and a half. he's about 2 years old now. almost 4". is he a rhom? he's pretty active and aggressive. here are some pix from beginning to now. thanks guys.
RHOM?
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thank you frank
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what have u been feeding him
he should be alot bigger than that
he should be alot bigger than that
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hmm...never seen a rhom with red fins
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he is in a 30gal and he always has guppies in his tank and he eats small goldfish and pellets. he is fed daily and he eats infront of me so i know he eats well. i feed all of my fish daily. i have to clean more often but i think its worth it. he was sold as a rhom by an lfs, but i will have to wait till he gets bigger. thanks all
The problem with juveniles rhombeus-group fishes, occasionally Pristobrycon can fool even experts in thinking what they are looking as S. rhombeus, which is my hesitation on being 'fairly' certain. The extra photos you've posted make me hesitate because a couple of them look "pristobrycon-like". The bars, spots and head shape put it in that area.
Allow it more time to grow out and keep a good catologue on its growth. I'd like to revisit your fish again when its grown more.
Allow it more time to grow out and keep a good catologue on its growth. I'd like to revisit your fish again when its grown more.
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will do frank
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Looks like that fish has a "Manueli-style" caudal fin - no dark terminal band and a prominent V at the base.
I thought Rhoms had more Nattereri-like tails, dark terminal band and base, without the distinct V-shape (I know, the comparisons are hardly scientific, if at all, but it's the easiest way to compare, imo.)
Could it be because of the size of the fish - 4" for a 2-year old Rhom doesn't seem much to me...
Or am I just way off?
I thought Rhoms had more Nattereri-like tails, dark terminal band and base, without the distinct V-shape (I know, the comparisons are hardly scientific, if at all, but it's the easiest way to compare, imo.)
Could it be because of the size of the fish - 4" for a 2-year old Rhom doesn't seem much to me...
Or am I just way off?
I'll answer it this way, some subadult Serrasalmus rhombeus have a dark "V" at the caudal and a faint band at the tail until past subadult. The compressus group, in particular S. altuvei can have a dark "V" at small sizes later grow out and have a dark band just like S. rhombeus. Pristobrycon can have both a dark "V" and a terminal band depending where they are in age. Its very interchangeable. That's why some compressus group fishes are mistaken for S. marginatus which predominately has a dark "V" throughout its life until maturity when the tail darkens nearly completely to just a hyaline edge (like S. maculatus). ON his photos, I'm thrown by the added photos of what appears to be a Pristobrycon.
One last thing, Antonio Machado when he revised the genus/species of S. eigenmanni made a remark that this species confused him because of the ontogeny, meaning the strong resemblence to a Serrasalmus species (rhomboid body, pointy snout) to later developing into a Pristobrycon appearance (small snout, laterally compress body).
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oh, now you come aroundhastatus said:
http://www.piranha-fury.com/pfury/index.ph...topic=29027&hl=
From last year
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is the fact he could hold it in his hand any evidence? I've never heard of a rhom being that docile but i'm just throwing ideas out there
The big problem (that I have) in PID is to much usage of variable photos. If the hobbyist would just select 2 good (clear) photos w/o angle that would help so much more. In the case of the above photos, the chronological order is off and hard to tell in what order of growth (and age) they appear. Certainly looks like 2 different species being shown which clouds the issue more. I don't disagree much of PiranhaMaster regarding placement of the fish as a Pristobrycon. The issue is not being right on the "guess" as much as being able to get a good image to resolve the ID issue. My impression at the young ages was S. rhombeus in the original thread. Subsequent photos (if it is the same fish) begin to show tell-tale signs of bars and spots, consistent with compressus-group member. Yet the snout as it begins to develop more (and body) begins to laterally compress suggesting a Pristobrycon. Is it S. eigenmanni? Don't know without having the actual collection point as many of these humeralis-type fish are extremely close in appearance. So even if we can agree the fish in question is a Pristobrycon, it still leaves the question which species. And only time will reveal that based on how well the photos are taken and displayed.
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alot of juvi rhoms have red finscompton ass steve said:
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