- Skeletal muscle
- Cardiac muscle
- Visceral muscle

- Spleen
- Thymus
- Renal hemopoietic system
- Various lymphoid organs - Phagocytic system

- Oral cavity
- Esophagus
- Stomach         
- Small and large intestine

- Swim or gas bladder

- Excretory kidney
- Other excretory organs

- Pituitary gland
- Urophysis
- Interrenal and chromaffin tissues
- Thyroid gland
- Endocrine pancreas
- Corpuscles of Stannius
- Ultimobranchial gland
- Pseudobranch and choroid body
- Pineal gland
- Endocrine cells of the gut
- Gonads

- Auditory (inner ear) and lateral system
- Chemoreception (taste - olfaction)
- Electric organs and electroreceptors
- Vision
- Various senses