“…Recent neuropharmacological studies (Akoev et al 1991) have identified L-glutamate, L-aspartate, or a substance of similar nature as the most probable neurotransmitter in the electroreceptor organ of the skate. Identification of glutamate as the neurotransmitter was not possible in the case of the marine catfish Plotosus (Bennett and Obara 1986), but neurotransmitter activity was ascribed to 'a different but probably similar molecule'.…”