Na spisku su riba i piletina.

Because the subject is actually riba i piletina = fish and chicken, which is a coordinated subject made of two nouns.

Even though each noun is singular on its own, together they form a plural idea, so Serbian uses the plural form of to be:

• je = is
• su = are

So:

• Riba je na spisku. = Fish is on the list.
• Piletina je na spisku. = Chicken is on the list.
• Riba i piletina su na spisku. = Fish and chicken are on the list.

This is because su is a clitic in Serbian. Clitics usually go in the second position of the sentence or clause.

So in:

• Na spisku su riba i piletina.

the first unit is Na spisku, and su comes right after it.

A very common alternative is:

• Riba i piletina su na spisku.

This is also correct. Here the first unit is Riba i piletina, so su comes after that.

So both word orders are natural, but they put the focus in slightly different places:

• Na spisku su riba i piletina. → emphasizes on the list
• Riba i piletina su na spisku. → emphasizes fish and chicken

Spisku is in the locative singular.

The basic form is:

• spisak = list

After the preposition na when talking about a fixed location or position, Serbian uses the locative:

• na spisku = on the list

So:

• nominative: spisak
• locative: spisku

This kind of change is normal for masculine nouns in Serbian.

Because Serbian uses na with spisak idiomatically, just like English says on the list, not in the list.

So the natural expression is:

• na spisku = on the list

Even if a learner might expect u from the idea of being inside something, Serbian simply does not normally say u spisku here.

They are in the nominative, because they function as the subject of the sentence.

The structure is basically:

• Na spisku = prepositional phrase
• su = verb
• riba i piletina = subject

So the nouns stay in their dictionary/basic form:

• riba
• piletina

In this sentence, it most naturally means fish as food, especially because it appears together with piletina.

In Serbian, riba can mean:

• a fish / fish as an animal
• fish as food

Context tells you which meaning is intended.

Since the sentence is about what is on the list, and it pairs riba with piletina, the food meaning is the most likely one.

Piletina usually means chicken meat.

If you want to talk about the animal itself, you would more often use words like:

• pile = chick
• kokoška = hen
• piletina = chicken meat

So in this sentence, piletina is understood as a food item.

Serbian has no articles like English a/an/the.

So:

• riba can mean fish, a fish, or the fish
• piletina can mean chicken, the chicken, etc.

The exact interpretation depends on context.

That is why Serbian learners of English often have to learn to add articles, while English speakers learning Serbian have to get used to leaving them out.

Because the sentence is naming the items in a general way, and both nouns are in the nominative singular.

This is especially common with food words, where Serbian often uses a singular form to refer to the substance or category:

• riba = fish
• piletina = chicken

Using plural forms would change the feel or the meaning:

• ribe often suggests fish as individual animals or multiple fish
• piletine is not what you would normally use here for chicken meat

So riba i piletina is the natural way to list these foods.

Yes, absolutely.

Both are correct:

• Na spisku su riba i piletina.
• Riba i piletina su na spisku.

The difference is mainly in information focus:

• Na spisku su riba i piletina. → answers something like What is on the list?
• Riba i piletina su na spisku. → answers something like Where are fish and chicken? or simply states the fact with focus on the nouns

Yes, it is perfectly normal.

It sounds natural in contexts like:

• a shopping list
• a menu
• a list of allowed foods
• a list of available items

It is a straightforward, everyday Serbian sentence.

A simple approximate pronunciation for an English speaker is:

nah SPEE-skoo soo REE-bah ee pee-lyeh-TEE-nah

A few notes:

• Na = nah
• spisku = SPEE-skoo
• su = soo
• riba = REE-bah
• i = ee
• piletina = roughly pee-lyeh-TEE-nah

The i in Serbian is usually like ee in see.

In standard Serbian, you should keep su here.

So the normal sentence is:

• Na spisku su riba i piletina.

Leaving out su would sound incomplete or like a note headline rather than a full standard sentence.

For learners, the safe rule is: if you are making a full present-tense sentence with to be, keep the correct form of the verb.