NPY-like immunoreactivity in the brain of the teleost Tinca tinca (Cyprinidae).

The distribution of neuropeptide tyrosine (NPY) in the brain of the tench (Tinca tinca) was mapped immunohistochemically by the peroxidase-anti-peroxidase (PAP) technique. NPY-immunoreactive (NPYi) neurons were found in the nucleus entopeduncularis (ne). These perikarya were intensely immunostained and were surrounded by a large number of axons and fibre terminals.

SRIF-like immunoreactivity in the brain and pituitary of Tinca tinca (Cyprinidae, Teleostei).

SRIF-immunoreactive perikarya occurred in the nucleus entopeduncularis, the nucleus praeopticus and praeopticus periventricularis, in the nucleus lateralis tuberis pars anterior, the nucleus ventromedialis, and in the nucleus posterior periventricularis. Additionally, SRIF-containing neurons were located in the nucleus dorsomedialis and dorsolateralis thalami. Weaklyimmunoreactive perikarya were found medially to the nucleus diffusus tori lateralis and in the rostral rhombencephalon, laterally to the fasciculus longitudinalis medialis, and dorsally to the fasciculus longitudinalis lateralis.

Serotonin-immunoreactive neurons in the brain of Eigenmannia lineata (Gymnotiformes, Teleostei).

The distribution of serotonin-immunoreactive (5-HTi) neurons was determined by the peroxidase-antiperoxidase technique. 5-HT-immunoreactive nerve cells (or perikarya) occurred in the diencephalic nucleus ventromedialis (nvm), in the so-called pre-pacemaker nucleus (ppm), in a laterally located (unnamed) nucleus (G1), in the nucleus posterior periventricularis (nppv), the nucleus recessus lateralis (nrl) and the nucleus recessus posterior (nrp). 5-HT-immunoreactivity could be localized in the pars intermedia and the proximal pars distalis of the pituitary gland.

FMRFamide immunoreactivity in the brain and pituitary of Carassius auratus (Cyprinidae, Teleostei).

Neurons immunoreactive for the molluscan cardioactive peptide FMRFamide (FMRFi) in the brain of Carassius were demonstrated immunohistochemically with the peroxidase-antiperoxidase technique (PAP) and three antisera against this tetrapeptide. FMRFi perikarya were consistently found in the ganglion of the nervus terminalis, in some scattered neurons of the nucleus entopeduncularis, in the nucleus praeopticus pars magno- and parvocellularis, the nucleus ventromedialis, the nucleus posterior periventricularis, nucleus recessus lateralis and posterior. Some weak FMRFi neurons occurred in the rostral mesencephalic tegmentum and in the region of the nucleus gustatorius secundus.

Distribution of somatostatin (SRIF) in the brain and pituitary of Eigenmannia lineata (Gymnotiformes, Teleostei). An immunohistochemical study.

Somatostatin-immunoreactive (SRIFi) cells in the brain and pituitary of the weakly-electric teleost Eigenmannia lineata were identified immunohistochemically by the use of unlabelled antibodies and the peroxidase-antiperoxidase technique. Several groups of neurons and fibres were immunostained in Eigenmannia's brain. Intensely SRIFi neurons occurred in the nucleus entopeduncularis, in the nucleus preaeopticus, and in the nucleus dorsolateralis between the commissura posterior and the nucleus glomerulosus, the latter two structures being completely devoid of immunoreactive elements.