Showing papers by "Hartwick College published in 1973"
3 citations
TL;DR: Survival and developmental rate values show no differences due to culture method in cumulative zoeal development and agitation has no effect upon survival in any individual zoeal stage but does increase developmental rate in the first zoea and decrease it in the third z Zoea.
Abstract: Larvae of the mud crab,Rhithropanopeus harrisii, were raised using each of the three experimental procedures: shallow bowl, Erlenmeyer flask, Erlenmeyer flask agitated upon a reciprocating variable-speed shaker at 110 rpm. Survival and rate of development were calculated for each of the four zoeal stages and for cumulative zoeal development. The use of an Erlenmeyer flask as a culture vessel instead of a shallow bowl has no effect upon either survival or developmental rate. Survival and developmental rate values show no differences due to culture method in cumulative zoeal development. Agitation has no effect upon survival in any individual zoeal stage but does increase developmental rate in the first zoea and decrease it in the third zoea. These differential rates just compensate for one another, producing no net change for cumulative zoeal development under the experimental conditions.
2 citations
TL;DR: Red colored chromatophores having a constant arrangement in each of the six zoeal stages were studied and found to be distinctive and valuable for differentiating E. talpoids from others in the genus.
Abstract: Larvae ofEmerita talpoida (Say) were raised in the laboratory from the egg through the six zoeal stages. Red colored chromatophores having a constant arrangement in each of the six zoeal stages were studied. The pattern of these chromatophores was compared with that in descriptions of the larvae of other species ofEmerita and found to be distinctive. The constancy of these pigment areas makes them valuable for differentiatingE. talpoida larvae from others in the genus.
2 citations