I've used beam-break sensors for behavioral monitoring and even estimating counts in populations. However, the number of stacked assumptions here worries me. First, your number will be good for one species of fish in exactly that tank. In some other tank their activity might be different and the num...

I thought something similar. The coastal Thai drainages would seem to be pretty warm places and shallower water heats pretty quickly. Another Kryptopterus species has been found in water that averaged almost what my tank was at, but of course species in a single genus can be very different.

I maintain a large group of Kryptopterus vitreolus in my research lab. Today my research assistant and I pulled the heater out of the tank to fix the heater shield. We'd been debating the temperature set point for these fish and so I looked at the heater setting. It was at 88 degrees Fahrenheit. The...

Bas Pels wrote: ↑02 Dec 2017, 08:22 I think the temperature where the fish recover will be somewhat lower than the temperature which kills half the fish in 48 or 96 hours.

Presumably. I meant that they can recover from approaching the lethal temperature, as long as they don't die.

So, this wanders off topic a bit, but in the case of temperature where fish recover from heatstroke wouldn't the LT50 be a decent measure?

in most cases, LD50 tests are very crude, and mesningless. After all, why would we want to know what a certain compound does? I think in order to know how much we can savely eat of it, or spill into the environment. In my end of the world where LC50's are often measured for venoms or defensive toxi...

Thanks so much for the quick reply! I got this at a Petsmart so it was definitely mislabeled. I've been under the impression it was just a huge oto for years now! :/ I caught Petsmart with this exact same labeling problem about two weeks ago. They claimed on the tank to have otos but they were eith...

Thanks for the replies, everyone. This is very helpful.

Hey everyone, I'm looking into setting up a tank rack, probably 3x3 with 40-50 gallon tanks. I talked to someone at an LFS about making such a rack and it's doable (and expensive). I mentioned this to a friend who said, "Why not get heavy duty garage shelving instead?" He and I then checke...

Well Amazon Frogbit has been in there a while and is now growing well. The Echinodorus tennellus is still doing OK despite that it's losing light with the floating plant. Snails have been spotted so I've just treated with gastropex. Best of luck with your breeding attempt here! I think it's always ...

Just curious if there are. I have a 55 gallon that I want 100% devoted to smaller catfish species and I would love to find some middle dwelling catfish for it, if any such species exists of course. Glass cats stay relatively high in the water column as long as the light isn't too bright. (Mine will...

What I would be interested in is - would it be better to change 10 % a day, or 50 % a week. Unfortunately, this is not tried to be ansewered. You won't get the same result in chemical concentration because the amount of chemicals/ contaminants will be higher in a 50 percent change than respectively...

Real question: when are we getting an STL file so I can print the skull on my 3D printer?

We just found a 55gallon for $10 today! Which is a steal! Seriously. Would you have any recommendations on real plants we could put in the tank? As Victor said, you can collect them from the same habitat as the catfish. Plants that touch the air naturally will do the most good, since they can get c...

Just to give you an example of some really strange changes in aquaria without any obvious cause, I maintained an ecosystem tank for almost five years without ever feeding or treating it. It was a 55 gallon tank with an overhead light and a bubbler. No filtration, no feeding, no water changes. Someti...

Perhaps a coincidence but my brain figures that where corydoras aneus is naturally found you would find decomposing wood and plants in the water so their would be some nitrogen compounds in the water. 1) There's no need to guess, this is a water parameter people measure. 2) Decomposing plants have ...

Do you believe that you have bad bacteria in your tank? I ask because lots of laypeople seem to assume that bacteria = bad, but in a fish tank bacteria also perform all sorts of very, very important biological services, including breaking down ammonia. In marine tanks people use "live rock"...

Note: I have selected Kyrptopterus minor because it is the one available on the aqadvisor site. Probably AqAdvisor just has the species name wrong. Glass catfish are almost always K . vitreolus but are frequently misidentified as other species, in part because the vitreolus wasn't recognized as its...

These catfish, just like my 25 Pareutropius mandvillei, do much better in sizeable groups of ~12+. It makes them far less nervous. I have a species tank of glass cats, 13 of them, never any issues. So I second this. They might appreciate having a long side of the tank covered by something dark (I r...

Hi, I have four glass catfish and today I noticed one of the has white fuzzy spots inside. I was wondering if anyone could help me figure out what it is. Ick? Eggs maybe? Not eggs. That shiny sack in the anterior section of the body is where almost all the organs are in a glass cat. While reproduct...

...I'm not sure I see the merits of that choice. But I'm confident someone has put a lot of thought into it, so I will hold my tongue. Needless to say, no matter which human is recognized as the type specimen, it still doesn't help when comparing humans to all other ancient humanoids which are know...

As to the issue of synthesizing the species concept for similar phenotypes that are widespread geographically but are classified as one species, the paper above helps to explain why this is particularly complicated with fish. I'm thinking of how fish are restricted (usually) by watersheds. It's tem...

I very casually breed guppies and a while ago I transferred them from a 10-gallon with moderate vegetation to a 50-gallon that was thick with aquatic grasses, including fronds that lay across the surface of the water. I went from carefully saving a few fry to ignoring the tank and still having it ov...

It's actually not necessary in this situation for a lion to breed with a jaguar. All that is necessary is that sometime after the lion/jaguar split an individual in the lineage leading to modern-day lions bred with an individual in the lineage leading to modern jaguars which may have occurred before...

Bas Pels wrote: ↑04 Aug 2017, 22:13 Lycosid, while I don't like you using pedantic, you are right I was humanizing

I meant that my aside was pedantic, not that your note was. I guarantee you that this is a word that many people believe describes me.

Shane wrote: ↑04 Aug 2017, 16:35 Lycosid,
Just flipping through the channels and came across a National Geographic special on Wallago. Monster Fish season 4 episode 5 "Jungle Jaws."
Should be easy to find.
-Shane

Great! That should provide lots more reference material. Thanks for the tip.

Proteins are made from 20 different aminoacids, and only 8 of them are essential, that is, we are unable to make these, so we need to eat them. But we can convert them into any of the other 12. I´m rather certain this also goes for fish. While this may be what you meant, it's probable that plecos h...

I was brought up with the belief that catfish like old (spoiled) meat. Take a hot dog, age it in the back yard a few days, wipe off the maggots, and you have the best catfish food. If true, does it apply to plecos too? This probably attracts ictalurid catfishes (our North American variety) pretty w...

We've got a population of Pterygoplichthys sp. in North Carolina. Oddly, it's not in the Piedmont or coast, but in the mountains where it gets quite cold. It's the same situation you mention - a power plant is releasing the water it uses to cool itself into the lake and the plecos are restricted to ...

So I'm beginning to draw catfish (simple line drawings, left lateral view normally, suitable for diagrams but not in any way art) and I've been trying to get Wallago attu right. Besides the fact that it's got a weird mouth and a body so long that by the time I've drawn the head large enough to get t...