In less intensive shrimp culture systems, polychaetes are known to be a major food item of several penaeid species. Under these conditions, very little is known about their population dynamics and the possible interactions with penaeid predation and artificial feeding. This work examined the effects of Penaeus subtilis, predation, stocking density and supplemental feeding on the population dyna...

macrobentos frequency and biomass was investigated in the gorgan bay in 2011. five sampling sites were chosen to collect benthos and sediment from the bay using a van veen grab sampler. samples were collected seasonally. macrobenthos were indentified and their biomass was recorded. sediment heavy metals concentration were measured using atomic absorption spectroscopy. a total of 11 families bel...

Two large collections of Conus from the Galapagos Islands permitted the analysis of size, sex ratio, and food of 4 of the estimated 13 species of Conus present in the islands. The species investigated were C. diadema, C. lucidus, C. tiaratus, and C. nux. Significantly unequal sex ratios were found in the samples of C. diadema, C. lucidus, and C. tiaratus, but there was no indication of sexual d...

Actinosporean stages including spherical pansporocysts and oval tetractinomyxon actinospores about 8 μm long were found in two unidentified spionid polychaetes in the northern Øresund, Denmark. The myxosporean stages in fish are unknown. Members of the Spionidae occur worldwide and at all depths and it is likely that they act as invertebrate hosts for several species of Myxozoa. *Corresponding ...