Dietary crude oil exposure during sex differentiation skewed adult sex ratio towards males in the zebrafish.

Dietary crude oil exposure has detrimental morpho-physiological effects in fishes, including endocrine disruption. However, little is known about how it influences sex differentiation and its potential for skewing sex ratios of populations. Appropriate sex ratio is important for maintaining effective population size and structure.

Developmental cardiorespiratory physiology of the air-breathing tropical gar, Atractosteus tropicus.

The physiological transition to aerial breathing in larval air-breathing fishes is poorly understood. We investigated gill ventilation frequency (f), heart rate (f), and air breathing frequency (f) as a function of development, activity, hypoxia, and temperature in embryos/larvae from day (D) 2.5 to D30 posthatch of the tropical gar, Atractosteus tropicus, an obligate air breather.