Íslenskar landbúnaðarrannsóknir - 01.09.1978, Page 51

SPAWNER-RECRUIT RELATIONSHIP 49
TABLE 1.
Fishing regulations for the Ellidaár 1906—1977
Year Number of rods Days Hours/day Rod hours/season
1906—1946 2 92 15 2760 2760
1947—1960 2 46 15 1380
1947—1960 3 46 15 2070 3450
1961—1964 2 16 12 384
1961—1964 3 10 12 360
1961—1964 4 66 12 3168 3912
1965—1966 2 11 12 264
1965—1966 3 , 10 12 360
1965—1966 4 71 12 3408 4032
1967—68, 1970—73 . .. 3 20 12 720
1967—68, 1970—73 . . . 4 72 12 3456 4176
1969 2 20 12 480
1969 4 72 12 3456 3936
1974 3 10 12 360
1974 4 11 12 528
1974 5 71 12 4260 5148
1975—1976 4 21 12 1008
1975—1976 5 71 12 4260 5268
1977 4 21 12 1008
1977 6 71 12 5112 6120
TABLE 2. Catch records from the predocum-
entary period
Year Catch Effort
1907 ................. 1022 2 rods
1908 ................. 912 2 rods
1909 ................. 1121 3 rods
1915 .................. 1490 3 rods
1921 .................. 1874 3 rods
to question. Also during this period, the
mode of catch changed from trapping and
netting to rod ftshing, and the construc-
tion of the first dam was initiated at Ár-
baer. There are three documentary
periods. Documentary period one covers
the years 1925-1955 during which the
Reykjavík Electrical Co. assumed respon-
sibility for the fishery. Dramatic changes
in the quality of record keeping occurred
as a result of this assumption. A fish trap
was installed to capture fish for trucking
around the dam and a commerical re-
moval policy was established in 1931. By
the provisions of this agreement, 100% of
the first thousand fish trapped, 80% ofthe
second thousand, 60% of the third
thousand, 40% of the fourth thousand and
zero percent of all thousands thereafter
were to be trucked above the dam. The
rest could be removed and sold (Arni Ola
1961). In actual practice, the commercial
removals were more strongly tempered
by, and proportional to, the estimated
strength of the run than by this agree-