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4l through 44 adult euphausiids amphipods appear behavior chitinous Clarke-Bumpus closing concentration of plankton correct position correlation cruise crustaceans CTENOPHORES cycle deep scat deep scattering layer deep-scattering-layer depth scale distribution of plankton diurnal migration echo sounder EPCE(R eupha Euphausia pacifica Extinction coefficients fathogram Figure l2 gear Gordon Tucker haul was taken hauls 4l Hauls l0 Hauls taken hauls were taken hexaptera horizontal hauls IOOm l-meter l00 meters large copepods large numbers large sagittae llOOM main planktonts medusae meshes per inch Mysids nekton Nematoscelis difficilis numbers of euphausiids Oceanography phototropism phytoplankton plankton by volume plankton hauls present pteropods samplers San Diego Trough sea water series of hauls shown in figure small sagittae sound scatterers stippled band stratification SUBSTANTIAL PLANKTON surface layers tering layer Thysanoessa trace upper layers usiids vertical distribution vertical hauls vertical migration volume in hauls water strained WATERY PLANKTON zontal haul zooplankton