Epsilon Open Archive

In the egg survey conducted over three weeks (week 9, 14 and 17) in archipelago and fjord areas of Bohuslän during the spring of 2017 eggs from a total of 16 different fish species could be identified using genetic barcode markers. The surveyed area stretched from the island of Smögen in the north to the island of Marstrand in the south. Early stage fish eggs (stage Ia-Ib), as an indication of possible local spawning were identified for the species: cod, long rough dab, dab, plaice, sprat and flounder. Eggs from two other gadoids – whiting and pollack could also be identified, however, no specific egg stage could be determined for these species. Largest concentration of cod eggs (all stages) was found outside the Brofjord and inside the Gullmarsfjord as well as around the island of Lyr in between Orust and Tjörn. Early stage cod eggs (stage Ia-Ib) was mostly found outside the Brofjord and around Lyr. Flatfish eggs were generally found all over the surveyed area, but eggs from plaice were to some extent concentrated inside and outside of the Brofjord.