Preprint volume - SIBM
Preprint volume - SIBM
Preprint volume - SIBM
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Pre-print Volume –Posters<br />
NECTON AND FISHERY COMMITEE<br />
D. CUCCU, M. MEREU, P. MASALA, A. CAU, P. JEREB*<br />
Department of Animal Biology and Ecology, University of Cagliari, Via T. Fiorelli, 1 – 09126 Cagliari, Italy.<br />
cuccu@unica.it<br />
*ISPRA ex-ICRAM, Roma, Italy.<br />
FIRST RECORD OF STOLOTEUTHIS LEUCOPTERA<br />
(CEPHALOPODA: SEPIOLIDAE) IN THE SARDINIAN WATERS<br />
PRIMO RINVENIMENTO DI STOLOTEUTHIS LEUCOPTERA<br />
(CEPHALOPODA: SEPIOLIDAE) NELLE ACQUE SARDE<br />
Abstract – Morphometric and meristic data of two mature females of Stoloteuthis leucoptera<br />
(Cephalopoda: Sepiolidae) from the Sardinian waters are reported. These are the first records of the<br />
species in the Sardinian seas and they add important information to our still poor knowledge on the species<br />
in the Mediterranean Sea.<br />
Keywords: Stoloteuthis leucoptera, Mediterranean Sea, Sardinian seas, bottom trawling, fishery surveys.<br />
Introduction - The leucoptera bobtail squid, Stoloteuthis leucoptera (Verril, 1878), is<br />
distributed in the Western Atlantic Ocean from the Gulf of St Lawrence to the Straits<br />
of Florida and in the Eastern Atlantic, in the Bay of Biscay and in the Benguela Current<br />
off Namibia (Reid and Jereb, 2005). Only a few records exist for the Mediterranean<br />
Sea, where the species may be of recent introduction (Orsi Relini and Massi, 1991). As<br />
for the Italian waters, S. leucoptera was caught in the Ligurian Sea, in the northern and<br />
southern Tyrrhenian Sea and off the Gorgona Island (Reid and Jereb, 2005). Here, the<br />
first findings of the species in the Sardinian waters are reported and some<br />
morphometric and meristic data are presented.<br />
Materials and methods - Stoloteuthis leucoptera specimens were collected during the<br />
scientific trawl surveys MEDITS (Bertrand et al., 2000) and GRUND (Relini, 1998)<br />
carried out in the Sardinian waters during summer 2005 and winter 2007, respectively.<br />
Fresh specimens were measured (ML, to the nearest 1 mm) and weighted (TW, to the<br />
nearest 0.01 g); sex was determined and maturity stages were established using a 3<br />
stages maturity scale (Bertrand et al., 2000). Measurements and abbreviations used are<br />
those given in Roper and Voss (1983). The mandibles were removed and for each one,<br />
the upper crest (UCL), upper hood (UHL), upper rostral (URL), lower crest (LCL),<br />
lower hood (LHL) and lower rostral (LRL) measurements were taken (Clarke, 1986).<br />
Oocytes and spermatangia were measured along their major axis.<br />
Results - Two specimens of S. leucoptera (ML: 10.4 and 14.5 mm) were recorded, in<br />
the north-eastern Sardinian waters (N41°12,720' E9°55,880'-N41°12,830' E9°55,800')<br />
at a mean depth of 550 meters, and in the Gulf of Cagliari (N39°08,020' E9°20,780'-<br />
N39°06,800' E9°24,000') at 360 meters, along with other sepiolids. Both were mature<br />
females; their mantle cavity was filled mostly by the ovary and the white creamy<br />
nidamental glands. Oocytes in the ovary were reticulate and ranged in length between<br />
0.1 and 3.5 mm; oocytes in the oviducts were smooth, their size ranging between 3.5<br />
and 3.8 mm. Six spermatangia of about 0.5 mm length were found on one female (ML<br />
14.2 mm), embedded in the tissue above the left eye. Main morphometric and meristic<br />
data of the two specimens are given in Tab. 1.<br />
41 st S.I.B.M. CONGRESS Rapallo (GE), 7-11 June 2010<br />
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