These factors include delta sleep-inducing peptides, muramyl peptides, cholecystokinin, arginine
vasotocin, vasoactive intestinal peptide, growth hormone-releasing hormone (GHRH), somatostatin, prostaglandin D2, and adenosine.
Topics include immune and osmoregulatory interaction, the renin-angiotensin systems of fish, the effects of water acidity and hardness on the survival and growth of freshwater teleosts, cellular and molecular approaches, fish transportation, extreme or unstable habitats and their impact on teleosts, renal contributions to water and salt balance, immunochemistry in branchial ion transport, rapid regulation of ion transport in mitochondrion-rich cells, and the effects of diet, arginine
vasotocin and isotocin, energy metabolism and osmotic acclimation, intestinal transport processes, calcium, prolactin, growth hormones, insulin-like growth factors, cortisol and the thyroid gland.