Imam dovoljno ribe.

Imam is the 1st person singular present tense of imati (to have).

In Serbian, the subject pronoun is often omitted because the verb ending already shows who the subject is. So:

• Imam dovoljno ribe. = neutral, normal
• Ja imam dovoljno ribe. = more emphatic, like I have enough fish

So the version without ja is usually the most natural.

That is a very good question.

Normally, yes: a direct object after imati is often in the accusative:

• Imam ribu. = I have a fish / I have fish

But when you use a quantity word such as dovoljno (enough), the noun after it usually goes into the genitive, not the accusative.

So in:

• Imam dovoljno ribe

the whole phrase dovoljno ribe functions as the object, and ribe is in the genitive because it depends on dovoljno.

Here, ribe is most naturally genitive singular.

The noun riba is a feminine noun. Some key forms are:

• riba = nominative singular
• ribe = genitive singular
• ribu = accusative singular
• ribe = nominative plural
• riba = genitive plural

So the form ribe can mean more than one thing in Serbian, but in this sentence, after dovoljno, it is understood as genitive singular.

In this sentence, it is best understood as singular in form and mass-like in meaning.

That may feel strange to an English speaker, because English fish can be singular or plural without changing form. In Serbian, the speaker often chooses between:

• genitive singular for an amount/substance sense
• genitive plural for a number of individual fish

So:

• dovoljno ribe = enough fish, as an amount or in a general food/substance sense
• dovoljno riba = enough fish, meaning enough individual fish

In your sentence, dovoljno ribe sounds like the more general, natural choice.

The difference is mainly about how you view fish:

• dovoljno ribe = enough fish as an amount, supply, food, or general fish-material
• dovoljno riba = enough fish as separate individual fish

Compare:

• Imam dovoljno ribe za večeru. = I have enough fish for dinner.
• U jezeru ima dovoljno riba. = There are enough fish in the lake.

So both are possible, but they do not feel exactly the same.

Yes, normally dovoljno is followed by the genitive.

This is part of a broader Serbian pattern: many quantity words and expressions require the genitive. For example:

• mnogo vode = a lot of water
• malo vremena = little time
• dosta ljudi = enough / a lot of people
• nekoliko knjiga = several books
• pet dana = five days

So dovoljno ribe follows a very common Serbian grammar pattern.

Because Serbian does not have articles.

English forces you to choose between:

• a fish
• the fish
• just fish

Serbian usually leaves that to context. So riba / ribu / ribe can mean different things depending on the situation.

That means Imam dovoljno ribe could be translated in different ways depending on context, such as:

• I have enough fish.
• I have enough of the fish.
• I have enough fish meat / fish to eat.

English needs an article system; Serbian does not.

Yes. Serbian word order is more flexible than English word order.

The most neutral version is:

• Imam dovoljno ribe.

But you may also hear:

• Dovoljno ribe imam. = puts more focus on enough fish
• Ribe imam dovoljno. = more marked, often contrastive or stylistic

Even though the word order can change, the neutral textbook version is the one you have.

You would say:

• Nemam dovoljno ribe.

Here:

• nemam = I do not have
• dovoljno still requires the genitive
• so ribe stays the same

This is useful to compare:

• Imam dovoljno ribe. = I have enough fish.
• Nemam dovoljno ribe. = I do not have enough fish.

Then you would normally say:

• Imam ribu.

Here, ribu is accusative singular, because it is a normal direct object after imati.

So compare:

• Imam ribu. = I have a fish.
• Imam dovoljno ribe. = I have enough fish.

This contrast helps show why ribe appears in your original sentence: it is not just a plain direct object; it is part of a quantity expression with dovoljno.