Hepatic insufficiency in spawning Pacific salmon

The variability of some morpho-ecological factors was studied in 6 pelagic copepods from the North Aegean Sea. From the different findings it is concluded that temperature has a significant influence on body length; the higher the temperature of the environment during development, the shorter the body at maturity. The ratio of males to females is high in species which prefer warmer, and very low in species which prefer colder, waters. The percentage of copepodids in the entire population increases in winter and decreases considerably in summer.