This is not an idiom. Idioms make little or no sense unless you know the definition. This sentence makes perfect sense, so it is not an idiom. The dead fish smelled so bad that even as high as Heaven, you could smell them.
to have more important things to do
A fish out of water is in an alien environment. If you say that someone is "a fish out of water," then you are saying they are out of their element. Stan the accountant was a fish out of water at the plumbing convention.
The idiom "eagle eye" refers to having an acute eyesight, or an intently watchful eye. It refers to the sharp eyesight of an eagle, which are known for seeing fish from hundreds of feet up.
An important person. "A big fish in a small pond" is someone who is only important compared to the people around him because there's not much competition.
Whenever you see an idiom stating that something is "a different _______" (a different kettle of fish, a horse of a different color, etc), it just means that whatever topic has just been mentioned is totally different from what was spoken before. For example, if the topic of conversation is gambling, and someone mentions the game of bingo, a person might say "That's a whole different kettle of fish -- bingo isn't really gambling at all."
Yes, yes you will
I have bigger fish to fry is an idiom. An idiom is a phrase that is commonly used in certain areas that may have a funny meaning.
angel fish
In the United States, from a couple of different websites that I found, you should say "smelled," and not "smelt." Smelt is interchangeable with smelled in the UK, though, and is common over there. Smelt is also a type of fish.
to have more important things to do
Dead Fish was created in 2005.
nothing. A dead fish does not eat.
No but only if they eat poisoned dead fish
no they eat dead fish no they eat dead fish
I'm not certain that anyone has smelled or documented the odor of fish eggs other than those of caviar, which are said to smell like a 'sea breeze'; although that's not very descriptive if you've never smelled the sea.
one such young man was trout walker. his real name was charles walker, but everyone called him trout because his two feet smelled like a couple of dead fish.
"Głowa ryby", if what you write is not a kind of an idiom