Characterization of melatonin synthesis in the gastrointestinal tract of rainbow trout (Oncorhynchus mykiss): distribution, relation with serotonin, daily rhythms and photoperiod regulation

1. Muñoz-Pérez, J.L.
2. López-Patiño, M.A.
3. Álvarez-Otero, R.
4. Gesto, M.
5. Soengas, J.L.
6. Míguez, J.M.