First evidence of a new spawning stock of Illex coindetii in the North Sea (NE-Atlantic)

Oesterwind, Daniel; Bobowski, Bianca T. C.; Brunsch, Anika; Laptikhovsky, Vladimir; Hal, R. van; Sell, Anne F.; Pierce, Graham J.

doi:10.1016/j.fishres.2019.105384

Cited by 13 publications

(7 citation statements)

References 39 publications

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“…This pattern essentially follows the notion that the sardine is the “warm water species” of the two clupeids, and this is in accordance with the southerly and coastal distributions previously reported for sardine (Alheit et al, 2012). Furthermore, the bare indications from the present study and former studies (Alheit et al, 2012) that sardine may be increasingly reproducing in the North Sea, and not only enters in the adult stage through the prevailing inflow from the Channel, is in synchrony with other “southern” taxa, which have recently been able to reproduce in the North Sea, for example, cephalopods (e.g., Oesterwind et al, 2020).…”

Section: Discussionsupporting

confidence: 69%

“…Furthermore, the bare indications from the present study and former studies (Alheit et al, 2012) that sardine may be increasingly reproducing in the North Sea, and not only enters in the adult stage through the prevailing inflow from the Channel, is in synchrony with other "southern" taxa, which have recently been able to reproduce in the North Sea, for example, cephalopods (e.g., Oesterwind et al, 2020).…”

Section: Discussionsupporting

confidence: 67%

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Spatial separation of larval sprat (Sprattus sprattus) and sardine (Sardina pilchardus) related to hydrographical characteristics in the North Sea

Munk,

Huwer,

van Deurs

et al. 2023

Fisheries Oceanography

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Clupeid fish species are widely distributed and of highly variable stock sizes. In the North Sea, the common clupeid species are herring (Clupea harengus) and sprat (Sprattus sprattus), but during recent decades, the generally more southerly distributed sardine (Sardina pilchardus) have been more frequently observed. Comparative studies of early life stages of small pelagic clupeids are scarce, and their abilities to co‐exist and relations to environmental characteristics are vastly understudied. We here investigated and compared distributional patterns of co‐occurring larval sprat and sardine in the North Sea, hypothesizing that they are separated into spatial niches linked to specific hydrographical characteristics. Sampling was carried out by a large ring‐net during standard fish surveys (IBTS Q3) in August 2018, 2019, and 2020. Sprat larvae were found widespread across the area of investigation, with the highest concentration in the central North Sea off the eastern and northern flanks of Dogger Bank, where abundances could reach 20 larvae/m2. Sardine larvae, on the other hand, showed their highest abundances in the Southern and German Bights. Distributions of the two species appeared complementary, and statistical correlations were indicative of separate hydrographical niches, where sardine larvae resided in relatively warmer and fresher water. The relative abundances of sardine versus sprat varied between years. Sardine larvae were especially abundant in 2020, twice as abundant as sprat, and observations indicate increasing importance of sardines in the North Sea.

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Section: Discussionsupporting

confidence: 69%

Section: Discussionsupporting

confidence: 67%

Spatial separation of larval sprat (Sprattus sprattus) and sardine (Sardina pilchardus) related to hydrographical characteristics in the North Sea

Munk,

Huwer,

van Deurs

et al. 2023

Fisheries Oceanography

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“…In the North Sea, studies show that inshore squids ( Alloteuthis subulata (Lamarck, 1798) and Loligo forbesii Steenstrup, 1856) are more abundant than short-finned squid ( Illex coindetii, Todaropsis eblanae and Todarodes sagittatus ), and I. coindetii is among the rarest ommastrephid species caught 49 , 56 . However, two recent studies (1) on summer spawning stock of Illex coindetii in the North Sea 57 and (2) I. coindetii recorded from the brackish Baltic Sea 58 suggest more frequent visits to this area. Reports on Illex coindetii from Norwegian waters are scarce, but it has been reported from Oslofjorden 53 , and recently as by-catch from Stavanger area, and by divers from Oslofjorden and Bergen.…”

Section: Discussionmentioning

confidence: 97%

In situ recordings of large gelatinous spheres from NE Atlantic, and the first genetic confirmation of egg mass of Illex coindetii (Vérany, 1839) (Cephalopoda, Mollusca)

Ringvold¹,

Taite

Allcock

et al. 2021

Sci Rep

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In total, 90 gelatinous spheres, averaging one meter in diameter, have been recorded from ~ 1985 to 2019 from the NE Atlantic Ocean, including the Mediterranean Sea, using citizen science. More than 50% had a dark streak through center. They were recorded from the surface to ~ 60–70 m depth, mainly neutrally buoyant, in temperatures between 8 and 24°C. Lack of tissue samples has until now, prohibited confirmation of species. However, in 2019 scuba divers secured four tissue samples from the Norwegian coast. In the present study, DNA analysis using COI confirms species identity as the ommastrephid broadtail shortfin squid Illex coindetii (Vérany, 1839); these are the first confirmed records from the wild. Squid embryos at different stages were found in different egg masses: (1) recently fertilized eggs (stage ~ 3), (2) organogenesis (stages ~ 17–19 and ~ 23), and (3) developed embryo (stage ~ 30). Without tissue samples from each and every record for DNA corroboration we cannot be certain that all spherical egg masses are conspecific, or that the remaining 86 observed spheres belong to Illex coindetii. However, due to similar morphology and size of these spheres, relative to the four spheres with DNA analysis, we suspect that many of them were made by I. coindetii.

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“…The bathymetry and hydrology of the North Sea, as a shelf sea with an average depth of 90 m and a relatively narrow connection to the Atlantic Ocean(ESaTDOR, 2013), could prevent emigration from this area by passive drifting egg spheres and hatchlings of I. coindetii. Despite our observed differences in I. coindetii statolith shape between two sampling periods within the North Sea, this species has only one spawning season in the area(Oesterwind et al, 2020) and statolith shape did not differ among maturity stages (Q1: 2a, 2b; Q3: 3a, 3b) (Table…”

mentioning

confidence: 81%

Stock discrimination of two European squids (Illex coindetii, Loligo forbesii) by statolith shape analysis

Bobowski,

Power,

Burns

et al. 2024

Fisheries Management Eco

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We evaluated the feasibility of classifying ommastrephid and loliginid squid species by statolith shape analysis into fisheries management units or stocks. Statoliths of Illex coindetii (Verany, 1839) and Loligo forbesii (Steenstrup, 1856) were studied from multiple areas of the North East Atlantic and Northern Mediterranean Sea during 2021–2022. I. coindetii and L. forbesii individuals were categorized into multiple stocks across the areas studied. Stocks migrating between fishing areas as well as multiple stocks in the same area, as identified for L. forbesii in this study, need to be considered for sustainable fisheries management.

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First evidence of a new spawning stock of Illex coindetii in the North Sea (NE-Atlantic)

Cited by 13 publications

References 39 publications

Spatial separation of larval sprat (Sprattus sprattus) and sardine (Sardina pilchardus) related to hydrographical characteristics in the North Sea

Spatial separation of larval sprat (Sprattus sprattus) and sardine (Sardina pilchardus) related to hydrographical characteristics in the North Sea

In situ recordings of large gelatinous spheres from NE Atlantic, and the first genetic confirmation of egg mass of Illex coindetii (Vérany, 1839) (Cephalopoda, Mollusca)

Stock discrimination of two European squids (Illex coindetii, Loligo forbesii) by statolith shape analysis

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