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Some Aspects of the Biology of Bathypolypus Sponsalis (Mollusca, Cephalopoda) in the North Aegean Sea (Eastern Mediterranean

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Some Aspects of the Biology of Bathypolypus Sponsalis (Mollusca, Cephalopoda) in the North Aegean Sea (Eastern Mediterranean SOME ASPECTS OF THE BIOLOGY OF BATHYPOLYPUS SPONSALIS (MOLLUSCA, CEPHALOPODA) IN THE NORTH AEGEAN SEA (EASTERN MEDITERRANEAN SEA) D Onghia, A Tursi, A Matarrese, P Panetta To cite this version: D Onghia, A Tursi, A Matarrese, P Panetta. SOME ASPECTS OF THE BIOLOGY OF BATHY- POLYPUS SPONSALIS (MOLLUSCA, CEPHALOPODA) IN THE NORTH AEGEAN SEA (EAST- ERN MEDITERRANEAN SEA). Vie et Milieu / Life & Environment, Observatoire Océanologique - Laboratoire Arago, 1993, pp.161-164. hal-03045793 HAL Id: hal-03045793 https://hal.sorbonne-universite.fr/hal-03045793 Submitted on 8 Dec 2020 HAL is a multi-disciplinary open access L’archive ouverte pluridisciplinaire HAL, est archive for the deposit and dissemination of sci- destinée au dépôt et à la diffusion de documents entific research documents, whether they are pub- scientifiques de niveau recherche, publiés ou non, lished or not. The documents may come from émanant des établissements d’enseignement et de teaching and research institutions in France or recherche français ou étrangers, des laboratoires abroad, or from public or private research centers. publics ou privés. VIE MILIEU, 1993, 43 (2-3): 161-164 SOME ASPECTS OF THE BIOLOGY OF BATHYPOLYPUS SPONSALIS (MOLLUSCA, CEPHALOPODA) IN THE NORTH AEGEAN SEA (EASTERN MEDITERRANEAN SEA) D'ONGHIA G., A. TURSI, A. MATARRESE, P. PANETTA Institute of Zoology and Comparative Anatomy, University of Bari Via Amendola 165/A, 70126 Bari, Italy CEPHALOPODA ABSTRACT - The présence of the Cephalopod Bathypolypus sponsalis (P. & H. NEW RECORDS Fischer, 1892) in the North Aegean Sea (Greece) is recorded. Spécimens of this BIOLOGY species were found during four trawl surveys carried out from 1990 to 1991 in AEGEAN SEA MEDITERRANEAN SEA the Aegean Sea. Some biological aspects of the species are reported. CÉPHALOPODES RÉSUMÉ - La présence du Céphalopode Bathypolypus sponsalis (R & H. Fischer, MER EGÉE 1892) dans la Mer Egée septentrionale (Grèce) est signalée pour la première fois. MÉDITERRANÉE De nombreux exemplaires (94) de cette espèce ont été capturés pendant quatre BIOLOGIE croisières effectuées de 1990 à 1991 dans la Mer Egée. Quelques aspects de la biologie de cette espèce ont été analysés. INTRODUCTION Zoology and Comparative Anatomy of the Univer- sity of Bari (Italy) and the National Center for Marine Research of Athens (Greece) cooperate. Although the présence of Bathypolypus The area investigated, shown in Fig.l, covers sponsalis (P. & H. Fischer, 1892) in the Mediter- two zones of the North Aegean Sea. One lies near ranean Sea was first recorded in 1954 (Wirz, the Sporades Islands and has an area of 1954), there are some areas, mostly in the eastern 1 800 km2; the other, in the eastern area south of basin, in which the species had not been pre- the island of Limnos, has a surface of about viously recorded and its présence was therefore 6 000 km2. considered uncertain (Mangold & Boletzky, 1987). Récent research, aiming at the assessment of A professional trawler of 115 tons, equipped the demersal resources of the Aegean Sea, has led with a nylon net with 16 mm meshes to the cod- to the finding of some rare species including B. end, was hired. sponsalis. The sampling was random-stratified and the This report gives some information on the bi- area investigated was divided into three depth ology of this species. strata: 0-100 m, 100-200 m, 200-500 m. The minimum and maximum depths trawled were 60 and 440 m respectively in the western area and 32 and 437 m in the eastern one. MATERIALS AND METHODS The hauls, 11 in the western area and 21 in the eastern one, lasted each about 1 hour. The following data were collected during four The spécimens of B. sponsalis found during the trawl surveys carried out, respectively, in August- surveys were kept aboard in 5 % formol and their September 1990, November-December 1990, Feb- dorsal mantle length (DML) in mm and weight (in ruary-March 1991 and June 1991 within the EEC grams) were measured. For the spécimens for financed programme "Investigation of the abun- which it was technically possible, sex and stage dance and distribution of demersal stocks of pri- of maturity of the gonads (Mangold-Wirz, 1963) mary importance to the Greek fishery in the North were assessed and the eggs or spermatophores pré- Aegean Sea (Greece)", with which the Institute of sent in mature individuals were counted. 162 G. D'ONGHIA RESULTS 60 pear-shaped eggs were found, ranging from 6 to 13 mm in length. Sometimes smooth eggs were The 94 individuals of both sexes caught during found together with eggs with longitudinal strip- the trawl surveys are listed in table I with the geo- ing. In sexually mature maie individuals from 4 graphical position, depth of the station, body size to 8 spermatophores were counted, their maximum of the individuals and stage of maturity of their length was 22 mm, i. e. over 50 % of the dorsal gonads. mantle length. Bathypolypus sponsalis was found in both areas The smallest mature female individual had a on muddy bottoms starting from 300 m to the size of 30 mm and the smallest maie a size of maximum depth investigated (440 m). In the 27 mm. The hectocotylus arm was distinct, with catches, together with this octopod, the species developed ligula and calamus, even in immature Sepietta oweniana, Rossia macrosoma, Octopus individuals, and its length was 60 % of that of the salutii and, in deeper stations, Neorossia caroli, opposite arm. Todarodes sagittatus and Pteroctopus tetracirrhus The size/weight ratio for B. sponsalis was cal- were frequently présent. Sometimes Sepia or- culated pooling both sexes, because of the small bignyana, Illex coindetii and Eledone cirrhosa, number of individuals fished and also to be able which have a wide bathymetrical distribution, to compare data with those recently reported by were also found together with B. sponsalis. some authors for individuals fished in the Tyr- rhenian Sea and in the Channel of Sicily (Jereb The minimum and maximum dorsal mantle et al, 1989). The ratio was : W = 0.005201 * L2 37, lengths were 20 and 50 mm for females and 18 from which the allometric nature of the growth of and 40 mm for maies, respectively. The number B. sponsalis can be recognized. The size/weight of females and maies found in each trawl survey ratio calculated separately for each sex, although and their average sizes are given in table IL Be- it must be considered as scarcely reliable due to cause in the first two surveys only a few spéci- the small number of individuals for which it was mens were fished, the comparison between the established, stresses the tendency that, females mean sizes of the two sexes is reliable only with tend to weigh more than maies with equal mantle regard to the last two surveys. Evidence arises length. from the comparison that females have a greater mean size than maies (t = 4.17, d.f. = 39, p < 0.001 in February; t = 2.28, d.f. = 35, p = 0.029 in June). The spécimens fished in the Aegean Sea DISCUSSION AND CONCLUSIONS had rather stumpy mantles, nearly as wide as long, comparable to the type of the Balearic Islands (Wirz, 1955) which are also found in the Tuscan The finding of Bathypolypus sponsalis in the archipelago (Lumare, 1970). North Aegean Sea broadens its geographical dis- In mature females, fished during the surveys tribution in the Mediterranean Sea. Within this carried out in February-March and in June, up to distribution a geographical void exists in the Ion- CEPHALOPODA : BIOLOGY IN THE AEGEAN SEA 163 Table I. - List of spécimens of Bathypolypus sponsalis Table II. - Number of individuals of Bathypolypus found during four trawl surveys carried out in the North sponsalis, with average size (DML) and standard dévia- Aegean Sea from 1990 to 1991, with indication of fish- tion, found during four trawl surveys carried out in the ing zone, depth, individual size (in mm DML) and re- North Aegean Sea from 1990 to 1991. productive stage in both females and maies. Auq.-Sept. '90 Nov. -Dec.'90 Feb.-March '91 June '91 I = immature; m = maturing; M = mature. Females 2 7 1 8 1 4 DML (mm) 36.5±3.5 28 ,7±6.4 36.7±6.1 33.7±5.4 Maies 3 4 23 23 DML (mm) 32.7±2.1 32 .0±2.8 28.8±6.0 29.8±4.9 Survey Latitud./longitud. Depth Females Maies (m) DML(mrm ) Repr. Stage DML(mm) Repr. Stage Aug7Sept.'90 39»23'/23"18' 385 34 31 M 39 (Wirz, 1955), should not ban any species of Nov./Dec.W 39°13V24°37' 32 30 cephalopod from the Aegean Sea. Moreover, al- 40 32 though only a small number of individuals of B. 30 36 25 30 sponsalis have been found, its présence at greater 25 29 depths than those investigated, should not be ex- 20 cluded. Its batyhmetrical distribution does not Feb./Mar.SI 39°23723°18' 35 38 seem to be related to sex, as far as our data suggest. 45 40 The bathymetrical distribution of B. sponsalis 40 25 30 in the North Aegean Sea is also limited to the 30 30 bathyal zone; yet this species, rather than being 25 25 bathy-benthic as reported by Mangold-Wirz 39"20725"08' (1973), seems to be distributed on epi- and meso- 42 39°25724°42' 364 35 bathyal bottoms, in accordance with the findings 39D13724D37' 437 of Torchio (1968), Perez-Gandaras and Guerra (1978) and Jereb et al. (1989). Furthermore, this 32 42 cephalopod is rather uncommon in the environ- 37 ment in which it lives, as are Neorossia caroli and other bathyal species living in the investigated area (D'Onghia et al, in press).
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