Diel variation in vertical distribution of an offshore ichthyoplankton community off the Oregon coast

We examined the diel ver-tical distribution, concentration, and community structure of ichthyoplank-ton from a single station 69 km off the central Oregon coast in the northeast Pacific Ocean. The 74 depth-stratified samples yielded 1571 fish larvae from 20 taxa, representing 11 families, and 128 fish eggs from 11 taxa within nine families. Dominant larval taxa were Sebastes spp. (rockfishes), Stenobra-chius leucopsarus (northern lampfish), Tarletonbeania crenularis (blue lan-ternfish), and Lyopsetta exilis (slender sole), and the dominant egg taxa were Sardinops sagax (Pacific sardine), Icichthys lockingtoni (medusafish), and Chauliodus macouni (Pacific viperfish). Larval concentrations generally increased from the surface to 50 m, then decreased with depth. Larval concentrations were higher at night than during the day, and there was evidence of larval diel vertical migration. Depth stratum was the most important factor explaining variability in larval and egg concentrations.

Sipunculiens d'Indochine

This note reports upon the eighteen species of sipunculans from the coast of the Gulf of Tonkin. Detailed descriptions of Physcosoma albolineatum, Physcosoma scolops, Physcosoma nigrescens, Physcosoma pacificum, Physcosoma lurco, Physcosoma pelma, Siphonosoma cumanense, Siphonosoma australense, Sipunculus nudus, Sipunculus discrepans, Sipunculus robustus, Sipunculus phalloïdes, Aspidosiphon aspergillum, Aspidosiphon steenstrupii, Aspidosiphon exilis., Lilhacrosiphon, Dendrostoma Signifer are given.