You asked

Can my 6 month old baby have fish?

Yes, once your baby has gotten used to taking vegetables, baby rice and fruit from the spoon you can start offering fish (bones removed).
They can be blended to make sure the consistency is suitable for your baby’s stage of weaning. Boneless Cod and Salmon are great fish to begin with; try blending these with some vegetables. Also, we have a delicious recipe for healthy fish cakes on our website for when they are eating more textured foods.  

More questions

Best foods to begin weaning with
Can my 6 month old have fish?
Recommended age to start weaning
Fibre is important in your baby's diet but should only be present in small amounts as it can prevent the absorbtion of important minerals.
Fat is a vital source of energy for your growing baby.
Gluten is contained in foods such as wheat, rye, barley, and oats which are alll good sources of iron and fibre.
Honey should never be given to a baby under 12 months due to the risk of botulism poisoning.
There are lots of wonderful first foods for your baby to try including puréed vegetables, fruit, and baby cereals. 
There are lots of great ways to easily prepare and cook food for your baby.
A good breakfast is vital to ensure your baby is getting the best start to the day.