Preprint volume - SIBM

Pre-print Volume - Posters
BENTHOS COMMITEE
Tab. 1 - Octopus vulgaris: data of the specimens recaptured (*tags recovered in trammel nets).
Octopus vulgaris: dati relativi agli individui ricatturati (*marche rinvenute nei tramagli).
Specimens
Code
Weight at
release (g)
Weight at
recapture (g)
DF Sex
Maturity
stage
SGR
Straight distance from release
to recapture (meters)
146 600 900 25 Male 3 0.0162 520
213 520 600 8 Male 3 0.0179 1200
238 259 400 12 Male 3 0.0241 1200
204 329 455 20 Female 1 0.0162 20
183 620 620 18 Male 4 0.0000 1200
223 470 460 20 Male 4 -0.0011 510
180 390 370 30 Male 4 -0.0018 510
191 690 630 30 Male 4 -0.0030 1200
196 590 530 30 Male 4 -0.0036 1200
157* 700 - 42 Male - - 616
163* 1000 - 42 Male - - 411
Conclusions – The low number of recaptures highlights the need to carry out this kind
of experiment in fishing banned areas, probably with greater success. This could also
avoid that specimens tagged may lose their tag in an attempt to wriggle by the nets, as
we have observed. However, even if preliminary, our data are the first for the
Mediterranean. The SGRs recorded are in agreement with the high rates of growth and
within the large variability of this species, as well as zero or negative rates are due the
weight loss linked with the senescence (Domain et al., 2000). The recorded movements
do not seem linked with days of freedom but could be due to available food, and or to
the need to choose safe shelters where to spend daylight hours. However, they suggest
for the species, a more sedentary behavior in our area than that reported for Japan Sea
(48 km, see Nagasawa et al., 1993).
References
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Museo Nacional de Ciencias Naturales, CSIC, Madrid: 235-236.
NAGASAWA K., TAKAYANAGI S., TAKAMI T. (1993) - Cephalopod tagging and marking in
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SILVA L., SOBRINO I., RAMOS F. (2002) - Reproductive biology of the common Octopus,
Octopus vulgaris Cuvier, 1797 (Cephalopoda: Octopodidae) in the Gulf of Cadiz (SW Spain).
Bull. Mar. Sci., 71 (2): 837-850.
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