Ich mag keine Goldfische. / Ich mag Goldfische nicht.

[marcogaiotto]

Ich mag keine Goldfische. / Ich mag Goldfische nicht. (I don't like goldfish)

Hello! Can you help me, please?What's the correct option? Thanks a lot in advance!

 

[Hutschi]

Both are correct in German.
Ich mag keine Goldfische. -- negation is on "Goldfische" -- literally: I like no goldfishes. (I don't think this is idiomatic in Englisch, but I'm not sure.)
Ich mag Goldfische nicht. (I don't like goldfishes.)
A third option is "Goldfische mag ich nicht."

The basic meaning is the same, and mostly you can exchange both phrases.

Do you have any context? Otherwise I cannot tell you what is better.

 

[JClaudeK]

Dieses Thema wurde schon oft behandelt:

mag + kein / nicht
nicht/kein
ich mag keinen Fisch vs. ich esse gern Fisch

 

[marcogaiotto]

Thanks a lot to the both of you...There's no context given. I also thought of "Goldfische mag ich nicht".
Wir Lehrerhandbuch 1
Here I found "keine Goldfische" (page 43, ex. 9).

 

[JClaudeK]

I also thought of "Goldfische mag ich nicht".

Besonders in Sätzen mit "aber" (page 43, ex. 9)

Goldfische mag ich nicht, aber Hamster mag ich sehr.

 

[Hutschi]

ich mag keinen Fisch vs. ich esse gern Fisch

This has a very other meaning than in the original question. It means "I do not like to eat fish."

In case of goldfishes the topic is emotions, in case of fish it is meals.

(Both may be superseeded by context, but to eat goldfishes is extremely seldom.)

---
Because of the examples in #1 are from a teaching book without further context, I cannot tell what to prefer.

I want to give a short summary of the answers and an addition:

Correct:

Ich mag keine Goldfische.
Ich mag Goldfische nicht.
Goldfische mag ich nicht.

Usage often as contrast:

Goldfische mag ich nicht, aber Hamster mag ich sehr.

---
Addition:

Ich habe Goldfische gern. has the same meaning as Ich mag Goldfische. (and the other variants.)
"Gernhaben" (separable verb) is another translation of "to like".

 

[marcogaiotto]

Hutschi, yours is a useful piece of advice! Many thanks to all of you once again!