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45 species of Copepoda and 14 of Isopoda have been found on the South Adriatic (Montenegrian coast) fishes during the 10 years study. In addition to the check-list, some results of pathological and haematological investigations, showing that these parasites have a considerable impact on the growth, condition index and physiological state of hosts, are given.

Chemical and biological methods of the title arthropod pests control, during the past 1985-1989, have been reviewed. Among insecticides the chlorinated hydrocarbons, organophosphorous compounds, carbamates and particularly pyrethroids played still the outstanding role. Juvenoids, chitin synthesis inhibitors and semi-chemicals such as pheromones and feeding deterrents were discussed. WHO recommended insecticides for mosquito, housefly, cockroach Pharaoh's ant, flea, and bedbug control in Poland have been listed. Some biological methods applied against agricultural pests were mentioned.

In the Caspian Sea were found typically marine form--Pseudotracheliastes stellatus, specific for Acipenseridae, Thersitina gasterostei typical for sticklebacks rather euryhaline hosts, and Ergasilus briani, E. sieboldi, Paraergasilus rylowi, Lernaea elegans, L. esocina, Caligus lacustris, Argulus coregoni, A. foliaceus and Achtheres percarum normally infested the fishes in fresh water. The last one is characteristic for only Percidae, the remaining fresh-water crustaceans have far more wide host range. The majority of the parasitic crustaceans are noted in the coastal shallow areas of the Caspian Sea. Only P. stellatus is met too in the fairy deep places, where they are brought by Acipenseridae, which perform migrations of considerable extent.