- Does the physiology of chondrichthyan fishes constrain their distribution in the deep sea?
Summary: Chondrichthyan fishes (sharks, rays and chimaeras) are exceedingly rare or possibly absent at abyssal depths (>4000 m), unlike bony fishes. This Commentary discusses hypotheses implicating the unusual physiology of chondrichthyans as an explanation for their scarcity at great depths.
- Osmoregulation and salinity-induced oxidative stress: is oxidative adaptation determined by gill function?
Summary: Gill tissues with different functions (respiratory/osmoregulatory) differentially produce reactive oxygen species and are differently adapted to deal with oxidative stress.
- Interaction of osmoregulatory and acid–base compensation in white sturgeon (Acipenser transmontanus) during exposure to aquatic hypercarbia and elevated salinity
Summary: Acidosis recovery in hypercapnic sturgeon associates with plasma Na+ accumulation prior to and plasma Cl− removal following osmotic recovery, as osmoregulatory requirements transition from ion uptake to ion excretion throughout seawater acclimation.
- Physiological mechanisms used by fish to cope with salinity stress
Summary: Some fishes have evolved high salinity stress tolerance (euryhalinity), favoring adaptive radiation in a climate of rapidly changing and fluctuating salinity. The mechanisms underlying euryhalinity of fishes are outlined.
- Vasotocin and isotocin regulate aquaporin 1 function in the sea bream
Summary: This study investigated the regulation of fish aquaporin function by the neurohormones vasotocin and isotocin.
- The effects of acute salinity challenges on osmoregulation in Mozambique tilapia reared in a tidally changing salinity
Summary: This study characterizes the differences in osmoregulatory capacity among Mozambique tilapia, Oreochromis mossambicus, reared in freshwater (FW), seawater (SW), or under tidally driven changes in salinity.