Ecology Summary - Rhombosepion orbignyanum
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Ecology of Rhombosepion orbignyanum
 
Main Ref. Schneider, W., 1990
Remarks Inshore (Ref. 122891). A demersal (Ref. 1695), nektonic (Ref. 417), nektobenthic (Ref. 122890) species. Found over sandy and sandy-muddy bottoms (Ref. 1695) and detritus-rich continental shelf and slope (Ref. 417). In the Sea of Marmara, the species can occur in brackish waters. In Mediterranean waters, spawning period is likely continuous as males and females are usually found together throughout the year, with peaks in activity in spring and autumn. In Portuguese waters, predominance of mature individuals in spring is also reported. No record of onshore spawning migration. With the extended reproductive period, recruitment is also continuous but variable, with seasonal density peaks. Males mature at 6 or 7 months and females at 9 or 10 months. Eggs (7 to 8.5 mm maximum diameter and proportional to female size) are laid in clusters of 30 to 40 and are attached to sponges on muddy bottoms. Diet may consist of fish and cephalopods but mainly of crustaceans. One of the most abundant cephalopod species in some areas of the Mediterranean. Taken mainly as bycatch in trawl fisheries; marketed fresh and frozen along with S. elegans and small S. officinalis and constitutes a valuable resource locally. Intense fishing pressure on this resource is reported in the Sicilian Channel. Sympatric (and confused) with S. elegans Blainville, 1827 (Ref. 1695).

Aquatic zones / Water bodies

Marine - Neritic Marine - Oceanic Brackishwater Freshwater
Marine zones / Brackish and freshwater bodies
  • supra-littoral zone
  • littoral zone
  • sublittoral zone
  • epipelagic
  • mesopelagic
  • epipelagic
  • abyssopelagic
  • hadopelagic
  • estuaries/lagoons/brackish seas
  • mangroves
  • marshes/swamps
  • rivers/streams
  • lakes/ponds
  • caves
  • exclusively in caves
Highighted items on the list are where Rhombosepion orbignyanum may be found.

Habitat

Substrate Benthic: mobile; demersal; Soft Bottom: mud; ooze ( detritus );
Substrate Ref. Jereb, P. and C.F.E. Roper (eds.), 2005
Special habitats Other habitats: seamounts;
Special habitats Ref. Sabatini, A.: Follesa, M.C., I. Locci, G. Matta, F. Palmas, A.A. Pendugiu, P. Pesci and A. Cau, 2010

Associations

Ref. Schneider, W., 1990
Associations
Associated with
Association remarks
Parasitism

feeding

Feeding type mainly animals (troph. 2.8 and up)
Feeding type Ref. Jereb, P. and C.F.E. Roper (eds.), 2005
Feeding habit hunting macrofauna (predator)
Feeding habit Ref. Jereb, P. and C.F.E. Roper (eds.), 2005

Trophic Level(s)

Estimation method original sample unfished population Remark
Troph s.e. Troph s.e.
From diet composition
From individual food items 4.16 0.58 Trophic level estimated from a number of food items using a randomized resampling routine.
Ref.
Ref. [ e.g. 3742]
Glossary [ e.g. cnidaria]
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