In Jainism, sea burial is generally not considered an ideal or traditional practice.

Reason:

• It can cause himsā to marine life and other living beings in water.
• Jain funeral customs generally prefer cremation as the usual practice for householders.
• The main principle is to minimize violence and harm.

So, from a Jain point of view, sea burial would usually not be approved unless there is no other option and it is done with the least possible harm.

If you want, I can also explain the Jain view of cremation, burial, and handling of the body after death.