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
A couple of rhino questions for Jutta...
February 27, 2013
2:37 am
Avatar
mikev
NYC
Community Helper
Forum Posts: 1134
Member Since:
January 11, 2011
sp_UserOfflineSmall Offline

i hope you don't mind the bother... I'm toying with the idea of another rhino tank, and it seems that the availability includes these species;

Rhinogobius henchuenensis
Rhinogobius candidianus
Rhinogobius foromosanus

Recommendations?
(I looked them up on your site ... all look interesting enough, actually, this is why your opinion for the best one is being sought....of course chances of breeding is a big factor).

And also: i'm still getting nowhere with rubros... they are only eating, not interested in anything else. At least they are much prettier now.... I'm wondering if reconfiguring them may help? The group is 4m/2f (I did sex them right... the smallest male was masquerading as a female).. perhaps getting two more girls and splitting them 2m/2f per tank would help?

Thank you!

February 27, 2013
6:39 pm
Avatar
Matt
Málaga, Spain
Admin
Forum Posts: 8239
Member Since:
June 13, 2011
sp_UserOfflineSmall Offline

While you're at it Mike, what do you guys think this is?

Rhinogobius-Hristo-1-1.jpgImage Enlarger

Cake or death?
February 27, 2013
8:37 pm
Avatar
Plaamoo
Bellingham, Washington U.S.A.
Community Helper
Forum Posts: 1253
Member Since:
March 15, 2009
sp_UserOfflineSmall Offline

Hristov posted a better pic of it on facebook today. It showed what looked like breeding colors, nice!

February 28, 2013
10:58 pm
Avatar
Matt
Málaga, Spain
Admin
Forum Posts: 8239
Member Since:
June 13, 2011
sp_UserOfflineSmall Offline

These Jim? Think the fish posted above might be female and this one her boyfriend? Currently identified elsewhere as R. cf. nandujiangensis. Apologies for the semi-hijack Mike, can split this if you prefer.

Rhinogobius-cf-nanjungianensis-HH.jpgImage Enlarger

Rhinogobius-cf-nanjungianensis-HH-2.jpgImage Enlarger

 

Cake or death?
March 1, 2013
12:46 am
Avatar
Ferrika
Brunswick / Germany
Veteran
Forum Posts: 319
Member Since:
April 28, 2011
sp_UserOfflineSmall Offline

Hi Mike,
All three types have their own charm.
R. formosanus are the most colorful of the three, the greatest good with 12-15cm. They are very peaceful, but the larvae need when raising saltwater and Brachionus. Which are very small. My currently do not have tails anymore because I've taken too early from the salt.

R. candidianus are very charming, but a little more aggressive, within species as well as across species. The larvae are easy to pull great because although floating free, but very large and eat immediately Artemia.

R. henchuenensis are my favorites. Slightly smaller than R. candidianus (8 cm), relatively peaceful get very rare and easy to grow, because the larvae hatch also quite big and eat the same Artemia. A beautiful species.

 

Regarding your R. rubromaculatus, I'm pretty clueless. I've never seen that they not reproduce want, the opposite. I e.g. currently about 30 animals in a 100 x 50 aquarium, but the increase nevertheless. Could it be that your animals come from a breed that has been made infertile with medications?

Of course you can try your luck with two additional females, but I fear more, because something else is wrong.

 

@Matt

Matt, your question I already answered on FB (or rather, Hristos question Wink)

greets Jutta
March 1, 2013
8:32 am
Avatar
Matt
Málaga, Spain
Admin
Forum Posts: 8239
Member Since:
June 13, 2011
sp_UserOfflineSmall Offline

Aha so the id was from you. Ok perfect. :)

Cake or death?
March 1, 2013
2:49 pm
Avatar
mikev
NYC
Community Helper
Forum Posts: 1134
Member Since:
January 11, 2011
sp_UserOfflineSmall Offline

Thank you very much, Jutta,

It sounds like R. henchuenensis is the best choice. What do you mean by "get very rare", however?

As for my R. rubromaculatus: it is not the fertility, they simply are uninterested in spawning... in fact, the males are not interested in females, or even in impressing each other. The most I see is that once in a while a male goes into the cave, but would not stay there longer than a few minutes. :(
Most likely I'm doing something wrong... maybe too hot at 75F? or maybe the cave is wrong (but then the males still should react to each other)... or live food?

March 1, 2013
3:54 pm
Avatar
Ferrika
Brunswick / Germany
Veteran
Forum Posts: 319
Member Since:
April 28, 2011
sp_UserOfflineSmall Offline

24 ° C is actually a good average and not too warm. What do you feed them like that? Bloodworms? White mosquito larvae? Black? Tubifex? Artemia? It should preferably be a mixture of everything, live or frozen.

The rubromaculatus don't care for water values. They multiply really everywhere, whether soft or hard.

Incidentally, it is this: if the males are infertile, they care not for the females.

What you could try again: just let them a little hungry and, the water somewhat filthy. About two weeks no water change and to feed every three days. (In the time you have as much howling at other aquarists that the stupid critters not spawn and loudly complain that you will give them away to beginners, if there were not happened at last something! That's Part of the ritual Laugh). Then you make a large, cool water change and feed them vigorously with live food (not just blood worms!). Then you make once every three to four days large water change and feed them daily vigorous and then we'll see ....

 

Oh yes! The henchuenensis .... Are extremely rare in the trade, so you should take them as long as you can get them!

greets Jutta
March 1, 2013
4:34 pm
Avatar
mikev
NYC
Community Helper
Forum Posts: 1134
Member Since:
January 11, 2011
sp_UserOfflineSmall Offline

Feeding mostly frozen bloodworms and frozen spirulina brine shrimp. I gave them live white worms a couple of times (a friend manages to maintain the culture and donates some once in a while). They are not interested in artemia unfortunately. Feeding is 5 days with 2 off. The males are quite fat... but the females do not look too gravid.

What kind of spawning place you provide yours? Maybe my cave is simply not to their liking?

btw, here is a strange story about why it is 4m/2f and not 3m/3f I was trying for: I sexed by body shape and reconfirmed by the color of the rim on the fins... when I brought them home, it looked indeed like 3m/3f, but one smaller fish (thought female) was damaged: side fins were half-gone. And the males were seen trying to bite it... I actually saw a male biting off a bit more of the side fin! ... the fish was mostly hiding in the back for a couple of months, fully recovered, and turned out to be another male... now I cannot tell it from other males. So like with some other fish, smaller males may try to masquerade as females... it did it well enough to deceive me, but not to deceive other males.

Got you on R.henchuenensis --- will try, hopefully not too late.

March 1, 2013
10:53 pm
Avatar
mikev
NYC
Community Helper
Forum Posts: 1134
Member Since:
January 11, 2011
sp_UserOfflineSmall Offline

Hmm,.... just in case: do you know which antibiotics may cause infertility?

March 2, 2013
6:48 pm
Avatar
Ferrika
Brunswick / Germany
Veteran
Forum Posts: 319
Member Since:
April 28, 2011
sp_UserOfflineSmall Offline

Methylene blue in too high doses in spawning and juvenile fish can lead to infertility, Mike.

Incidentally, I have now a group R. henchuenensis offspring of my former breeding group get back :-) Pictures will come tomorrow ;-)

greets Jutta
March 4, 2013
3:26 pm
Avatar
mikev
NYC
Community Helper
Forum Posts: 1134
Member Since:
January 11, 2011
sp_UserOfflineSmall Offline

Congratulations!

Looking forward to photos and story!

(No reasons to think they were exposed to high meth blue. May I know what kind of spawning cave they use in your tank? -- perhaps what I gave them is just not suitable, even if zhoui's seem to like it.)

March 4, 2013
7:34 pm
Avatar
Ferrika
Brunswick / Germany
Veteran
Forum Posts: 319
Member Since:
April 28, 2011
sp_UserOfflineSmall Offline

sorry, I forgot to answer you on your question about the spawning caves. Mea culpa!

My gobies prefer behind closed tubes and flat, not too thin stone slabs.

 

The pica from the henchuenensis must wait. They are a little shy. I must them first a little bribe with good food ;-)

greets Jutta
March 22, 2013
2:58 pm
Avatar
mikev
NYC
Community Helper
Forum Posts: 1134
Member Since:
January 11, 2011
sp_UserOfflineSmall Offline

Well, they have closed pvc tubes now (a couple of sizes) but ignore them... :(

One more question if I may: any hints on sexing R. henchuenensis? The fish arrived but the vendor thinks they are all males... I have not seen them myself yet, likely in one week, hoping for some hints from you. Thank you!

March 31, 2013
6:12 am
Avatar
mikev
NYC
Community Helper
Forum Posts: 1134
Member Since:
January 11, 2011
sp_UserOfflineSmall Offline

In re R. henchuenensis: I have a group.

The fish seems full-grown and (fingers crossed) healthy. Quite active, and behave like zhoui's rather than rubro's: after eating enough, they switch to playing, ignoring the rest of the food (rubros will finish all food and wait for more). I even saw a male making face...impressive. Hopefully they don't kill each other, they are nearly the same size as R.guirinus.....

The bad news is that I have 4 certain males plus one near-certain :( I may even have an entire male group. I took all the fish that was available so if there are no females, it is real bad :(

March 31, 2013
1:48 pm
Avatar
Ferrika
Brunswick / Germany
Veteran
Forum Posts: 319
Member Since:
April 28, 2011
sp_UserOfflineSmall Offline

Hi Mike,

sorry, I didn't see your question a few days ago.

 

The female of R. henchuenensis don't have a yellow first dorsal spines in the first dorsal fin. Normally. But with good food at the first time it may be, they have color in the dorsal fin. But they never have an elongated first dorsal spines.

Finger crossed for you, that you have at least one female.

 

Did you see on my page for a pic of female?

greets Jutta
March 31, 2013
3:42 pm
Avatar
mikev
NYC
Community Helper
Forum Posts: 1134
Member Since:
January 11, 2011
sp_UserOfflineSmall Offline

Thanks Jutta,

Yes, looked at your page -- this is the only info source that is out there! So I'm pretty sure about the species, less so about the sexes. Here is a bad photo of a possible female: http://www.micropress-inc.com/fishpic/rh1.jpgImage Enlarger

(left fish). no elongated first dorsal, and -- I think this matters -- the 2nd dorsal is also short. But the fish is 20% smaller than the male on the right, so it can still be a younger male? (all of them are at least 2"..actually obvious males are 7cm and suspected females seem 55-60mm --- very close match to the numbers on your page!)

The fish on the right of the above photo shown here better: http://www.micropress-inc.com/fishpic/rh2.jpgImage Enlarger


While the 1st dorsal is not elongated (possibly shipping damage), the 2nd is so large that I think this is a definite male.

(I'll try to get better photos...but need to put some substrate/pvc's in the tank and wait for them to color up a bit too...the vendor kept them in the dark.)

March 31, 2013
4:13 pm
Avatar
mikev
NYC
Community Helper
Forum Posts: 1134
Member Since:
January 11, 2011
sp_UserOfflineSmall Offline

I meant to ask you one more (perhaps real dumb) question: r.guirinus: how would one go to set up a tank that will prevent murders? (the vendor said he has guirinus too...I forgot to look at them... but this is the fish that makes me very scared, previous attempt was a bloodbath, with males killing not just each other but females too).

incidentally, R. henchuenensis feel like close relatives of R.guirinus...

March 31, 2013
5:16 pm
Avatar
Ferrika
Brunswick / Germany
Veteran
Forum Posts: 319
Member Since:
April 28, 2011
sp_UserOfflineSmall Offline

hmm ... so in the photo above both animals are male, so I'm sorry. In the background, an animal is seen, which could be a female.
In the henchuenensis sees the sex very early, because the color is rather than as the extended fin.

To R. giurinus I can give you only the good advice: keep them in pairs, not in a group. The males do not kill females, the females make themselves. They are very jealous! But among the males are really aggressive.
If you can grow it, you can keep the offspring of a group that is no longer so aggressive. But as soon as pairs, make sure the floor with stones be made into a labyrinth, otherwise there are only fights again ... but among females * g *

R. giurinus and R. henchuenensis stand himself as a species very close. They both belong to brunneus complex. But the henchuenensis are themselves very peacefully. The only so aggressive Rhinogobius that I know so far, which are R. giurinus.

greets Jutta
March 31, 2013
5:49 pm
Avatar
mikev
NYC
Community Helper
Forum Posts: 1134
Member Since:
January 11, 2011
sp_UserOfflineSmall Offline

Darn, darn, darn. Thank you.

The other possible female stays in the back consistently. I'll try to take a photo... but it definitely has white (or yellow) first dorsal ray too. :(

Donno what to do now. I can probably get the vendor to import say another three... the price is not too bad ... but then I may have a tank with ten males. :(

With this kind of luck maybe it is the time to drop out of fishkeeping :(

Forum Timezone: Europe/Paris

Most Users Ever Online: 246

Currently Online: Shazray
1 Guest(s)

Currently Browsing this Page:
1 Guest(s)

Devices in use: Desktop (2)

Top Posters:

Stefan: 1567

Plaamoo: 1253

mikev: 1134

Malti: 1099

Mark Duffill: 1012

Member Stats:

Guest Posters: 0

Members: 30291

Moderators: 0

Admins: 2

Forum Stats:

Groups: 4

Forums: 10

Topics: 4596

Posts: 36616

Newest Members: mike76, Harvey, adennett, Brawny, qchris87

Administrators: dunc: 1323, Matt: 8239