LOGIN

RSS Facebook Twitter YouTube
GLOSSARY       

SEARCHGLOSSARY

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

PROFILESEARCH

Avatar

Please consider registering
guest

sp_LogInOut Log In sp_Registration Register

Register | Lost password?
Advanced Search

— Forum Scope —




— Match —





— Forum Options —





 

Minimum search word length is 4 characters - maximum search word length is 84 characters

sp_Feed Topic RSS sp_TopicIcon
Nannostomus - adipose fin
March 13, 2014
11:40 pm
Avatar
Graham Ramsay
Blairgowrie - UK
Veteran
Forum Posts: 301
Member Since:
July 24, 2010
sp_UserOfflineSmall Offline

Acording to the weitzman paper the adipose fin is absent in N. minimus whilst in N. marilynae it is always present. In the N. minimus I have most have an adipose fin and a few don't. (You can make out the adipose in the pictures of mine in the profile for N. miminus including the fry). I ordered some marilynae (definitately not minmus said the store, they are different from the minimus we had before) and a friend picked them up and has them in his tanks just now. They appear to all have an adipose and look suspiciously like my existing N. minimus. So what I guess I'm saying is that the presence, or not, of an adipose fin is not a diagnostic feature for N. minimus assuming all these fish are indeed N. minimus.

 

Capture.JPGImage Enlarger

March 14, 2014
2:00 am
Avatar
Byron Hosking
Veteran
Forum Posts: 151
Member Since:
November 3, 2008
sp_UserOfflineSmall Offline

Your last sentence may be the answer, on two fronts.  Could this species be N. digrammus?  Looks similar to me, but photos are not always easy in identification.

There are some photos supposedly of N. minimus here

http://apisto.sites.no/fish.as.....gruppeId=5

though I've no idea as to the reliability of the species ID.

In the species N. eques the adipose may or may not be present, according to Weitzman.  I have this species, and the adipose fin is so tiny I can barely see it but it is present at least on some of my fish.  I also have the similar N. unifasciatus which is supposed to have an adipose, but mine do not, unless here again it is so miniscule I just can't see it.  It would seem that there is some variation within certain species in this genus.

Weitzman and Cobb (1975) is not a recent work.  Weitzman (Stanley and I believe his wife Marilyn) supplied the data on these species for the 2003 Checklist...does anyone have access?  I did once, but now can't seem to get it online.  It is pages 241-251.  This might have something more recent?

 

Byron.

Byron Hosking, BMus, MA Vancouver, BC Canada
March 15, 2014
10:13 am
Avatar
Matt
Málaga, Spain
Admin
Forum Posts: 8239
Member Since:
June 13, 2011
sp_UserOfflineSmall Offline

Graham, is presence or absence of the fin variable in the fry or only the adults?

Weitzman gets his information regarding N. eques from the o.d. by Steindachner. I'd always assumed that presence or absence of an anal fin in Nannostomus was relative to population, i.e., some have it, some don't, but if there's variation within populations could it be that the group is in the process of losing the fin? It appears to be a variable trait throughout Lebiasinidae.

 

Cake or death?
March 18, 2014
11:54 pm
Avatar
Graham Ramsay
Blairgowrie - UK
Veteran
Forum Posts: 301
Member Since:
July 24, 2010
sp_UserOfflineSmall Offline

From what I can see, and it's difficult to make out, some have, most have not.

 

Nannostomus_minimus_6weeks.jpgImage Enlarger

Nannostomus_minimus_6weeks_2.jpgImage Enlarger

March 31, 2014
10:45 am
Avatar
Matt
Málaga, Spain
Admin
Forum Posts: 8239
Member Since:
June 13, 2011
sp_UserOfflineSmall Offline

That's really interesting. Wonder if it's natural or a result of population-mixing.

Cake or death?
May 5, 2014
12:37 am
Avatar
deepinpeat
New Member
Forum Posts: 5
Member Since:
May 4, 2014
sp_UserOfflineSmall Offline

Did anyone consider this could be a mutation caused by some endogenous factor or such mutation already fixed in an aquarium population? Where did the breeders come from + if they were wild cought are you sure they come form the some population? Some populations species may also be able to crossbreed. I know a guy offering N.mortenthalleri x N.beckfordi hybrids. Def interresting stuff here, glad to find such a forum. 

 

Pavel

Forum Timezone: Europe/Paris

Most Users Ever Online: 246

Currently Online:
1 Guest(s)

Currently Browsing this Page:
1 Guest(s)

Devices in use: Desktop (1)

Top Posters:

Stefan: 1567

Plaamoo: 1253

mikev: 1134

Malti: 1099

Mark Duffill: 1012

Member Stats:

Guest Posters: 0

Members: 30292

Moderators: 0

Admins: 2

Forum Stats:

Groups: 4

Forums: 10

Topics: 4596

Posts: 36616

Newest Members: fitzkneemd, mike76, Harvey, adennett, Brawny

Administrators: dunc: 1323, Matt: 8239