В аквакультуре найти какой-либо дешёвый способ — это сложная задача.

Questions & Answers about В аквакультуре найти какой-либо дешёвый способ — это сложная задача.

Why use какой-либо here instead of какой-нибудь or какой-то?
Какой-то implies a specific but unknown method ("some method"). Both какой-нибудь and какой-либо mean "any method", but -либо is much more formal and often implies a categorical "any whatsoever". Because this sentence sounds like an academic or technical statement about aquaculture, the formal какой-либо is the natural choice.
Could we just use любой instead of какой-либо in this sentence?
Yes, they are very close in meaning here, but there is a slight nuance. Любой means "absolutely any (pick one, it doesn't matter)", focusing on the free choice among options. Какой-либо focuses more on the existence of the thing, meaning "any kind of cheap method, if one even exists at all."
Why is there an em-dash before это?
In Russian, when the subject of the sentence is an infinitive verb (here, найти) and the predicate is a noun (задача), they are separated by a dash. The word это is frequently added to strengthen the connection, acting similarly to the verb "is" in English.
Why don't the endings change for какой-либо дешёвый способ if it is the object of the verb?
It is actually in the accusative case because it is the direct object of найти (to find). However, because способ (method/way) is an inanimate masculine noun, its accusative form is identical to its nominative form. The pronoun какой-либо and adjective дешёвый agree with the noun, so they also look like their dictionary forms.

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