| Popis: |
Artemia nauplii of a Canadian sulphate-tolerant strain from a newly available commercial source were compared with Artemia salina from two other sources for effectiveness in supporting larval development of the grass shrimp, Palaemonetes pugio . Nauplii were fed to isolated zoea larvae reared in artificial sea water of 17‰ salinity at 25°C. Sulphate-strain Artemia gave survival at least as good as that provided by nauplii from San Francisco, and superior to that provided by nauplii from Great Salt Lake. Source of Artemia used as food had no effect on total duration of larval development nor on mean number of stages. Hatching success of the Canadian cysts was inferior to that of the other strains when 48h were allowed for hatching, and dilute sea water was the hatching medium. The medium recommended by the supplier was not superior to diluted sea water, but the longer hatching time recommended may increase total hatch. If improved hatching procedures can be developed, Artemia from this source may be very satisfactory for culture work. |
