This is definitely normal. Sometimes you catch a can , sometimes you catch some points , and sometimes you catch a big fish ( like you did ). However , when you catch the big fish , it will not appear in your items , souvenir , etc. And as I know , it doesn't affect the hungry and happy hearts. Further investigation will be done with "the big fish". (lol). But for now , it's catagorized as a random fishing animation.
Tama62