Preprint volume - SIBM

Pre-print Volume –Posters
NECTON AND FISHERY COMMITEE
Tab. 1 - Stoloteuthis leucoptera: details of captures and measurements of the two mature females.
Stoloteuthis leucoptera: dettagli sulle catture e misure delle due femmine mature.
Specimen Specimen
Specimen Specimen
Specimen Specimen
1
2
1
2
1
2
Data 29/06/2005 20/02/2007 HL (mm) 9.6 11.1
UCL
(mm)
3.99 4.68
Depth (m) 529–558 280–401
HW
(mm)
13.4 15.3
UHL
(mm)
2.22 2.93
ML (mm) 10.4 14.5 FL (mm) 9.8 12.9
URL
(mm)
1.11 1.40
VML (mm) 13.1 19.3 FW (mm) 6.7 9.8 LCL (mm) 2.36 2.74
MW (mm) 12.2 18 TtL (mm) 41.7 56.2
LHL
(mm)
1.03 1.31
TW (g) 1.66 3.92 TL (mm) 61.7 81.8 LRL (mm) 0.93 0.99
Conclusions - The finding of S. leucoptera in the Sardinian waters allows to update the
cephalopods checklist in this area (Cuccu et al., 2003) and widens the fragmentary
geographical distribution known for the species in the Mediterranean Sea. The depth of
capture is in agreement with the bathymetric distribution reported for the species (Reid
and Jereb, 2005), and both specimens were collected along with other sepiolids, as
observed in other Mediterranean areas (in Boletzky, 1995). The fact that both
specimens captured were mature may indicate an extended reproductive period. The
combined presence of oocytes of different size, only the larger and smooth of which
were found in the oviducts, suggests that S. leucoptera is a multiple spawner. The
presence of spermatangia deeply implanted into unmodified tissue of the females, as
occurs in other deep-waters cephalopods, supports a sperm storage strategy useful to
prolonged spawners. Present observations are in favour of the existence of stable
populations of this species in the Mediterranean Sea, as future findings on reproductive
aspects may confirm.
References
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