Hlo, hope you are doing well.
You can do the various courses for further study in animal husbandry and fishery.

B.sc in animal husbandry

Diploma in animal husbandry

B.sc in fishery and aquatic life

Diploma in aquatic life

Various institutions all over the country offers these courses and you can also go for masters and further PhD in it and go for different institutions as lecturer and researcher.
Best wishes