Ultraviolet vision and foraging in dip and plunge diving birds

Many fishes are sensitive to ultraviolet (UV) light and display UV markings during courtship. As UV scatters more than longer wavelengths of light, these signals are only effective at short distances, reducing the risk of detection by swimming predators. Such underwater scattering will be insignificant for dip and plunge diving birds, which prey on fishes […]

Vitamin D content in Alaskan Arctic zooplankton, fishes, and marine mammals

Abstract 10.1002/zoo.10104.abs We postulated that dietary ingestion of vitamin D may be used by some Alaskan Arctic marine mammal species in addition to, or instead of, cutaneous production to meet nutritional requirements. Zooplankton (n=5) sampled near Kaktovik, Alaska, contained no measurable vitamin D2 or D3, but did contain provitamin D (7-dehydrocholesterol), the cutaneous precursor for […]

Acquisition of fishes and aquatic invertebrates for zoological collections. Is there a future?

Abstract 10.1002/zoo.10100.abs The majority of the freshwater fishes in the ornamental trade now originate from captive-bred sources, as do a large proportion of the freshwater species exhibited in public aquariums. In contrast, commercial operators who also supply marine specimens to the ornamental trade remove directly from the wild approximately 98% of the marine fishes and […]

Under-ice observations of behavior of selected native and exotic fishes of the St. Lawrence river system

Abstract 10.1002/zoo.1430130604.abs Winter behavior of two native fishes (yellow perch, Perca flavescens, and killifish, Fundulus heteroclitus) and an exotic (goldfish, Carassius auratus) were studied in an outdoor experimental pond to quantify and link behavior to environmental conditions, and to identify interactions among the species that now co-occur in the wild. Killifish had high mortality and […]

Plasma cortisol response of seawater-adapted mummichogs (Fundulus heteroclitus) during deep MS-222 anesthesia

Abstract 10.1002/zoo.1430100110.abs Anesthetics are used to reduce stress in fishes during handling and transfer. However, deep anesthesia of seawater-adapted mummichogs (Fundulus heteroclitus) results in a time-related increase in plasma cortisol, indicating a primary (neuroendocrine) stress response. Groups of seven fish were bled within 1 to 12 min of exposure to the anesthetic MS-222. Plasma cortisol […]

Species identity and the temporal characteristics of fish acoustic signals

Analyses of the acoustic signals of fish show that fine-scale temporal patterns of signals are what vary among species. A growing body of research addressing the topic of species differences in fish acoustic signals suggests that these differences are related to mate choice or species isolation. However, little behavioral work has been done to determine […]