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  • 1
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    Reproductive systems and mating traces of the Sub-Antarctic deep-sea squid Onykia ingens (Cephalopoda: Onychoteuthidae) (2016)
    PANGAEA
    In:  Supplement to: Hoving, Henk-Jan T; Arkhipkin, A I; Laptikhovsky, Vladimir V; Marian, J E A R (2016): Mating tactics in the sub-Antarctic deep-sea squid Onykia ingens (Cephalopoda: Onychoteuthidae). Polar Biology, 39(7), 1319-1328, https://doi.org/10.1007/s00300-015-1856-z
    Details
    Publication Date: 2023-06-12
    Description: We performed quantitative assessment of the reproductive systems of deep-sea species Onykia ingens. Our goals were to: 1) quantify spermatophore production 2) determine the (preferred) location for spermatangia deposition; 3) investigate whether male and female O. ingens mate with multiple mates. Towards this end we examined male and female O. ingens specimens from Falkland Island and New Zealand waters.
    Type: Dataset
    Format: application/zip, 2 datasets
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  • 2
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    Reproductive systems of the Sub-Antarctic deep-sea squid Onykia ingens (Cephalopoda: Onychoteuthidae) (2016)
    PANGAEA
    Details
    Publication Date: 2023-06-12
    Keywords: DIVERSE; Index; Length; Length, maximal; Length, minimal; Mass; Number; O.ingens_Jul2006; Ratio; Sampling gear, diverse; Species; Station label; Weight; Width
    Type: Dataset
    Format: text/tab-separated-values, 166 data points
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  • 3
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    Mating traces of the Sub-Antarctic deep-sea squid Onykia ingens (Cephalopoda: Onychoteuthidae) (2016)
    PANGAEA
    Details
    Publication Date: 2023-06-12
    Keywords: Category; DIVERSE; FV_Manuel_Angel_Nores_2006; Length; Location; Manuel Angel Nores; Mass; Number; O.ingens_Mar2006; Sampling gear, diverse; Side; Species; Stage; Station label; Status
    Type: Dataset
    Format: text/tab-separated-values, 680 data points
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  • 4
    Electronic Resource
    Electronic Resource
    Age and growth of the mesopelagic squid Ancistrocheirus lesueurii (Oegopsida: Ancistrocheiridae) from the central-east Atlantic based on statolith microstructure (1997)
    Springer
    Marine biology 129 (1997), S. 103-111 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Statolith microstructure was studied in 56 Ancistrocheirus lesueurii (25 to 423 mm of mantle length, ML) caught in the central-east Atlantic. Statolith growth increments were grouped into three main growth zones, distinguished mainly by increment width. The second transition in the statolith microstructure (from Zone 2 to Zone 3) coincides with the life history shift from epipelagic and upper mesopelagic to a bathyal habitat. Second-order bands (mean 27.65 growth increments) and sub-bands (mean 13.6 growth increments) within statolith microstructure appeared to be related to the lunar cycle. Striking sexual dimorphism is reflected in the age and growth rates: males live ca. 1 yr, while females only start maturing at this age and obviously live 〉1.5 yr. A. lesueurii is a slow growing squid, attaining 25 to 30 mm ML at the age of 100 d. After ontogenetic migrations into bathypelagic waters at ML 〉 30 to 35 mm, growth rates gradually decrease to the minimum known values for squids. Based on back-calculated hatching dates, A. lesueurii hatches throughout the year with a peak between November and March.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002270050151
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  • 5
    Electronic Resource
    Electronic Resource
    Reproductive strategy of a primitive temperate notothenioid Eleginops maclovinus (2005)
    Oxford, UK; Malden, USA : Blackwell Science Ltd
    Journal of fish biology 66 (2005), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The reproductive biology of Eleginops maclovinus was examined in the Falkland Islands between October 2000 and December 2002. Males predominated at total lengths (LT) of 10 to 52 cm and females at 〉53 cm LT. Length frequency analysis showed a bimodal distribution with females representing the larger mode for every month during the study period. Gonad histology revealed that 19% of the histological samples studied were considered to be those from hermaphrodites: morphologically as male gonads but containing protoplasmic oocytes. It was therefore concluded that E. maclovinus is a protandrous hermaphrodite. The size of first (male) maturation of E. maclovinus was 30·73 cm LT. Males and females matured from August onwards and spawning occurred between September and December at depths of 〉40 m. Eleginops maclovinus has the smallest eggs and highest fecundity among the notothenioids. The highest potential fecundity was attained at maturity stage III with c. 48 million eggs. Because of further oocyte resorption, this value gradually decreased until the final fecundity ranged from 1·1 to 7·3 million eggs. Oocyte length frequencies in ovaries suggested that E. maclovinus was a batch spawner. Hydrated oocytes were found to contain a large perivitelline space indicating that the egg had a pelagic development.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.0022-1112.2005.00663.x
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  • 6
    Electronic Resource
    Electronic Resource
    Age, growth, stock structure and migratory rate of pre-spawning short-finned squid Illex argentinus based on statolith ageing investigations
    Amsterdam : Elsevier
    Fisheries Research 16 (1993), S. 313-338 
    Details
    ISSN: 0165-7836
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0165-7836(93)90144-V
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  • 7
    Electronic Resource
    Electronic Resource
    An impact of seasonal squid migrations and fishing on the feeding spectra of subantarctic notothenioids Patagonotothen ramsayi and Cottoperca gobio around the Falkland Islands (2003)
    Berlin, Germany : Blackwell Verlag GmbH
    Journal of applied ichthyology 19 (2003), S. 0 
    Details
    ISSN: 1439-0426
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Seasonal changes in the diet of two abundant notothenioid fishes, rock cod Patagonotothen ramsayi (Nototheniidae) and frogmouth Cottoperca gobio (Bovichthidae) were studied on the Falkland Island shelf. The rock cod is a near-bottom browser, feeding mostly on gelatinous and crustacean plankton. The diet of juveniles [10–16 cm total length (TL)] includes mostly copepods in summer and comb jellies Mnemiopsis leydyi in winter. Adult rock cod (17–34 cm TL) in summer consumed mainly plankton, with comb jellies and salps being of primary importance. In winter they mainly took benthos, primarily ophiuroids and lobster krill (Munida spp.), and the comb jelly. During the fishing season, rock cod also scavenge on fishing discards. The frogmouth is a benthic ambush predator; both small (11–30 cm) and large (31–80 cm) representatives feed on the rock cod throughout the year. During the seasonal offshore migration of the squid Loligo gahi (June–August), this prey predominated in the large frogmouth diet, with crab, Peltarion spinosulum, of secondary importance. The region is seasonally exploited by the squid trawl fishery. As the fishing season commences (August–September), discarded rock cod also becomes an important food item for the frogmouth. Seasonal offshore migrations of L.gahi into the common depth range of both notothenioids have a significant direct (change in the C. gobio diet) and indirect (scavenging on fishing discards and targeting bottom scavengers by P. ramsayi and C. gobio during the squid fishing) impact on their diets over the Falkland shelf. The niche breadth of rock cod varied from 2.63 to 3.21 and that of frogmouth varied from 2 to 6.29, depending on fish size and season.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1439-0426.2003.00340.x
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  • 8
    Electronic Resource
    Electronic Resource
    Variation in the diet of the Patagonian toothfish with size, depth and season around the Falkland Islands (2003)
    Oxford, UK : Blackwell Science Ltd
    Journal of fish biology 63 (2003), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The ontogenetic and seasonal variations in the feeding spectrum were studied in 756 specimens of the Patagonian toothfish Dissostichus eleginoides (16–159 cm total length, LT) collected on the shelf, continental slope and bathyal waters (67–1960 m, depth range) around the Falkland Islands between April 1999 and August 2002. On the shelf, small toothfish (〈40 cm LT) were active predators taking mostly one relatively large prey item at a time (mainly near-bottom Patagonotothen ramsayi and Loligo gahi). Medium-size toothfish (40–60 cm LT) fed on the same prey, but the number of prey items increased to 1–2 items per fish. Large toothfish (〉60 cm LT) switched their diet to other large pelagic fishes occurring near the bottom (Macruronus magellanicus and Micromesistius australis australis), again taking mostly one prey item at a time. The diet of medium-size D. eleginoides on the shelf varied seasonally depending on the abundance and migrations of the major prey species. Patagonotothen ramsayi was abundant in the diet throughout the year, whereas L. gahi appeared only from February to October during its offshore seasonal migrations to the depth range of D. eleginoides. During November to January, L. gahi migrated inshore to spawn and disappeared from the toothfish diet, being substituted by M. australis australis which dispersed on the shelf after spawning. After its ontogenetic descent to the lower part of the continental slope (500–1000 m depths), toothfish took less active (than on the shelf) fishes such as Antimora rostrata whilst also feeding on active near-bottom macrourids and skates. In their deepest habitat (〉1000 m depths), toothfish became a typical opportunistic predator, feeding mainly on relatively small and inactive fishes, squids and prawn-like crustaceans Acanthephyra pelagica and Thymops birsteini. Decrease in hunting activity with depth could be related to a specific adaptation to keep neutral buoyancy by increase of lipid content in white muscles of D. eleginoides with size.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1095-8649.2003.00164.x
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  • 9
    Electronic Resource
    Electronic Resource
    Variation in the diet of Genypterus blacodes(Ophidiidae) around the Falkland Islands (2004)
    Oxford, UK; Malden, USA : Blackwell Science Ltd
    Journal of fish biology 65 (2004), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The diet change with size, season and area was investigated using the stomachs of 496 kingclip Genypterus blacodes collected around the Falkland Islands (south-west Atlantic) between August 2001 and September 2002. The key prey species were rockcod Patagonotothen spp., benthic isopods and Patagonian grenadier Macruronus magellanicus. Kingclip 〈50 cm total length (LT) fed mainly on crustaceans and small fishes. With size the diet shifted away from crustaceans towards Patagonotothen spp. in kingclip 50–100 cm LT, and finally towards larger fishes such as M. magellanicus and Micromesistius australis australis in kingclip 〉100 cm LT. The niche breadth was highest in fish 〉100 cm LT and the lowest in fish 〈50 cm LT. The larger kingclip generally selected larger individuals of the same prey species, with the exception of the Patagonian squid Loligo gahi, where all ingested squid were of similar size, regardless of the predator length. The importance of the main prey species varied substantially between five consequent seasons studied, and appeared to follow the seasonal abundance and availability of prey. The spatial variability in the diet was found in kingclip caught in regions occupied by transformed temperate and sub-Antarctic waters. The rockcod, which is available throughout the year around the Falkland Islands, was the most important prey in the kingclip diet. Kingclip takes advantage of other seasonally abundant prey species during their seasonal migrations (e.g. L. gahi) and also scavenge on discards from fishing vessels when available.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.0022-1112.2004.00476.x
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  • 10
    Electronic Resource
    Electronic Resource
    Possible imitation of jellyfish by the squid paralarvae of the family Gonatidae (Cephalopoda, Oegopsida) (1996)
    Springer
    Polar biology 16 (1996), S. 531-534 
    Details
    ISSN: 1432-2056
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  Paralarval behaviour of eight species of the family Gonatidae (Teuthoidea, Cephalopoda) was examined in small 3-l aquaria on board ship during planktonic surveys, which were carried out above and off the continental slope of the western part of the Bering Sea. Undisturbed paralarvae moved in aquaria with an average frequency of 15–20 mantle contractions per minute. In response to a sudden disturbance (flash of light, impact to the aquarium wall) squids exhibited a defensive body posture, relaxing the mantle and pulling the head with tentacles and arms into the mantle cavity, thereby becoming similar in appearance, size and colour to small jellyfishes Aglantha digitalis (Hydromedusae).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003000050086
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