Forty-five vessels had, during the whole fishing time, fished 3266 times and caught 21,623 barrels of herrings, consequently on an average 6.66 barrels every time the nets were laid; however, there having been 882 times a miscatch, the above-named number really has been caught in 3266-882=2,384 times fishing. Hence the catch of every time of fishing amounts to 9.1 barrels.
Source: wiktionary