central europe, early christian monasteries adopted roman aquacultural practices. [ ] aquaculture spread in europe during the middle ages since away from the seacoasts and the big rivers, fish had to be salted so they did not rot. [ ] improvements in transportation during the th century made fresh fish...
(picture not licenced under creative commons) shell : neritoid (the species name indicates this already) with distincive difference between male and female snails (see picture above). the shell of this snail is quite heavy and thick. colour: olive green with faint brown bands. operculum: corneous body...