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Povzetek: One specimen of the dusky spinefoot, Siganus luridus (Rüppell, 1829) (+, total length = 17.3 cm, total weight = 87.61 g), a lessepsian migrant, was captured in the Mljet Channel (Southern Adriatic, Croatian coast) on 15 November 2010. This is the second record of this species from the Adriatic, but first well documented and based on the captured specimen. First record occurred earlier in the Northern Adriatic, but was based solely on underwater observations.
Ključne besede: fishes, ichthyology, Adriatic sea, Siganidae, lessepsian migrants, diversity, origins, Mediterranean, new record, Adriatic Sea
Objavljeno v DiRROS: 07.08.2024; Ogledov: 31; Prenosov: 23
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Povzetek: The paper reports an unusual expansion of the red alga Laurencia obtusa in shallow waters of the Zambratija Bay (northern Adriatic Sea). The large population of L. obtusa was never observed during underwater surveys conducted in recent years. In this area, benthic communities dominated by brown algae from the genus Cystoseira were present. The authors therefore assume that some environmental factors have probably changed and have favoured the extension of this red alga. The hypothesis for this phenomenon takes into account the possibility that the establishment of the invasive green alga Caulerpa cylindracea in the Zambratija bay has had a negative impact on native macroalgal assemblages.
Ključne besede: algae, shallow waters, monospecific populations, Zambratija Bay, Adriatic Sea
Objavljeno v DiRROS: 07.08.2024; Ogledov: 33; Prenosov: 27
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Povzetek: On 6th May 2018 a juvenile specimen of ribbon fish (Trachipterus trachypterus) was collected in shallow waters in Izola (Slovenia, northern Adriatic Sea). It measured 403 mm in total length and weighed 37.1 g. In stomach, fragments of seagrasses, pollen cones of pine, petals of terrestrial plant, fragments of terrestrial grass and beetles were found among food remains. The possible causes of this finding in Slovenian waters could be attributed to the ingression of southern Adriatic waters in its northern part. The specimen studied in this paper is the fifth record of this species in the Slovenian part of the Adriatic Sea. The cooperation between ichthyologists and fishermen proved to be crucial for the detection of the ribbon fish and other rare and less-known fish species, as well.
Ključne besede: ribbon fish, occurrence (biology), diet, Adriatic Sea
Objavljeno v DiRROS: 07.08.2024; Ogledov: 28; Prenosov: 28
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Povzetek: The Canestrini’s goby is a small goby endemic to the Adriatic basin, inhabiting brackish and fresh waters. The species is threatened by habitat destruction and pollution. For this reason, the goby is protected in part of its range, while its conservation status in other areas is not yet established. The detailed biogeography of the species should be known so that appropriate conservation measures can be taken. Despite extensive sampling of fish fauna in coastal wetlands, this species has not yet been detected in Slovenia. In this study, the first record of Ninnigobius canestrinii (Ninni, 1883) in Slovenian waters is reported along with a comprehensive review of documented records of the species.
Ključne besede: Gobiidae, endemic goby, endangered species, habitat endangerment, habitat destruction, biogeography, northern Adriatic basin, Slovenia
Objavljeno v DiRROS: 06.08.2024; Ogledov: 28; Prenosov: 15
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Povzetek: Background. The blackspotted smooth-hound, Mustelus punctulatus Risso, 1826, has been regularly caught in the northern Adriatic Sea, although a decreasing trend in its catches was observed off the coast of Slovenia within the last decade The knowledge of feeding behaviour of elasmobranch fish species, through understanding of the local food web structure, contributes to better and more efficient fish stock assessment and ecosystem modelling. This study is a first step in determining the prey consumption by the blackspotted smooth-hound in the area. Materials and methods. A total of 151 blackspotted smooth-hounds caught by commercial fishermen in the Gulf of Trieste from 4 June 2002 to 4 June 2003 were examined in this study. The stomach contents were removed, sorted and identified to the lowest possible taxon using identification keys. Preys were counted and weighed. Frequency of occurrence (F%), relative abundance (N%), the percentage by weight (W%), the Index of Relative Importance (IRI), and its standardized value (%IRI) were calculated following standard procedures. For comparing the diet between four different size classes we calculate average prey weight, dietary diversity, average meal, and trophic level for each size class. Results. A total 130 fish stomachs contained prey items. Crustaceans were the most important prey items (IRI% = 56.14), whereas cephalopods were the second mostly preyed animals (IRI% = 20.2). Teleost fish and bivalves were also found in the stomachs. The most important prey species was Solecurtus strigillatus. Larger sharks consumed larger preys. Male and female sharks consumed similar food. Juvenile individuals consumed predominantly crustaceans, while cephalopods were more important in the diet of adult individuals. The calculated trophic index (TROPH) of M. punctulatus from northern Adriatic Sea was 3.7, showing that it is a highly carnivorous species. Conclusion. This study is a first step in determining prey consumption by Mustelus punctulatus which is, despite the fact that is still common in the area, a rather poorly known species. For elucidating the role of benthic sharks in the study area the further step would be to study the diet of a closely related common smooth-hound M. mustelus.
Ključne besede: fishes, ichthyology, Adriatic sea, Triakidae, Mustelus punctulatus, trophic level, northern Adriatic, elasmobranchii, diversity, Mustelus, Mediterranean, feeding, Adriatic Sea
Objavljeno v DiRROS: 05.08.2024; Ogledov: 57; Prenosov: 55
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