The zebrafish Danio rerio, is an important model organism in developmental genetics, neurophysiology and biomedicine, but little is known about its natural ecology and behaviour. It is a small, shoaling cyprinid, native to the flood-plains of the Indian subcontinent, where it is found in shallow, slow-flowing waters. Zebrafish are group spawners and egg scatterers, although females are choosy w...

A fully nonlinear Boussinessq-type model with several free coefficients is considered as a departure point. The model is monolayer and low order so as to simplify numerical solvability. The coefficients of the model are here considered functions of the local water depth. In doing so, we allow to improve the dispersive and shoaling properties for narrow banded wave trains in very deep waters. In...

Zebrafish have been gaining increasing popularity in behavioral neuroscience. However, the number of behavioral test paradigms specifically designed for zebrafish, and in general the amount of information available on the behavior of this species, is relatively small when compared with classical laboratory model organisms such as the mouse, the rat, and the fruit fly. A particularly typical beh...

Temperature-depth recorders (TDRs) were attached to pelagic longline gear in the Hawaii-based commercial fishery to obtain actual fishing depths and to test the accuracy of catenary algorithms for predicting fishing depths. Swordfish gear was set shallow by typically deploying four hooks between successive floats. The observed depth of the settled deepest hook had a median value of 60 m for 333...

This combined numerical/laboratory study investigates the effect of stratification form on shoaling characteristics internal solitary waves propagating over a smooth, linear topographic slope. Three types are investigated, namely (i) thin tanh (homogeneous upper and lower layers separated by pycnocline), (ii) surface (linearly stratified layer overlaying homogeneous layer) (iii) broad (continuo...