Page 6 - Sella_M_1929

To which should be added the folloT,ving other reports of hooks „
found in previous years?
Taokle Origin Place of Recovery

1912 1 hook Tarifa Puglia (Gallipoli)
1924 1 hook Azores Sardinia (isola Plana)
19— 1 hook Malaga Algeria (Arzeu)

I owe the identification of the two hooks from the Azores (certain^
at least, for one of them) to Major J. Agostinho, Director of the Meteoro-
logical Service of the Azores , who made an accurate investigation in the
islands concerning these hooks with their typical method of tying, which
it has not been possible to find anywhere elsei and I owe to Br, Ove H8eg,
who took charge personally of the researches in Norway, the recovery of
the North Spanish hook in the Oslofjord„

To Mr. Karekin Devedjian, I owe the certain identification of
the leads from Constantinopleo

In the last few years there has taken place, in respect to the
type, a change in the frequency of the Spanish hooks found in the
Mediterranean. While earlier the hooks from Tarifa (near the Strait of
Gibraltar) were most frequent, now these have become rare and there
arrive instead with relative frequency hooks for tuna and "bonito,"
employed by the Spaniards in Spanish waters; and this is related to
the fact that the hook and line fishery for tuna at Tarifa has decayed
while that for the "bonito" in the Gulf of Gascony has had a great
developmento We have here an indirect proof which confirms the real
origin of the hooks which are foundc

Another proof of the continual movements of tuna is in the scarcity
of discoveries of local hooks in the tuna captured in the same places,
or in the vicinity of the places where such hooks are employed, except where
there is an immediate connection in time and in the direction followed
by the tuna, as I will show in speaking of the Sicilian fisheries for
returning tuna.
These discoveries, while they furnish a secure basis for the primary
conclusions, also permit of extension and the giving of a more general
interpretation of the phenomenon of the migrations of the tuna.
The tuna , in the Me-i.terranean , cannot be separated into
1 )
autochthonous groups , corresponding to different basins o — There occurs
a continuous exchange of tuna from one point to anothero Naturally this
does not preclude the schools' remaining for a certain time in a given
sea, and therefore one may speak in a relative sense of sedentariness.
Let us take for example the Adriatico The operation of the tuna traps
there shows the movements which the tuna make,, The tuna commence coming
from the south and from the offshore waters to the east coaet of the