The Journal publishes original contributions dealing with the following fields of investigations. Phytoplankton, marine algae, zooplankton, nekton, benthos, corals and coral reefs; ecology, zoogeography and systematics; primary production and experimental work on ecosystem including energy flow at different trophic levels; population dynamics and theoretical models; recycling of matter, influence of environmental factors on metabolic activity; marine microbiology; mariculture and experimental work on propagation of cultivable species; biology of fishes, marine reptiles, sea birds and mammals; physical, chemical, geological and meteorological features of the environments related to marine biology, marine environmental damage caused by pollution and engineering works; underwater observations; conservation of living resources, modifications in methodology and techniques and development of new apparatus related to marine sciences.