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  • 1
    Electronic Resource
    Electronic Resource
    FIRST RECORDED MASS STRANDING OF SHORT-FINNED PILOT WHALES (GLOBICEPHALA MACRORHYNCHUS GRAY, 1846) IN THE NORTHEASTERN ATLANTIC (2000)
    Oxford, UK : Blackwell Publishing Ltd
    Marine mammal science 16 (2000), S. 0 
    Details
    ISSN: 1748-7692
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1748-7692.2000.tb00958.x
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Fishery biology of the seven star flying squid Martialia hyadesi at South Georgia during winter (1998)
    Springer
    Polar biology 19 (1998), S. 231-236 
    Details
    ISSN: 1432-2056
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A scientific research fishing expedition targeting the oceanic/slope ommastrephid squid Martialia hyadesi was undertaken by a Korean-registered squid jigger in CCAMLR area 48.3, near South Georgia, in June 1996, providing the first opportunity to collect data on the fishery biology of this species during the austral winter. Fishing took place over a period of 8 days; a series of eight drifts was undertaken along an approximately east/west transect of about 200 nautical miles to the north and west of South Georgia, over depths ranging from 1,700 to 2,713 m. All fishing was to the south of the Antarctic Polar Front. Data were collected on sea surface temperature, catch per unit of effort, size, sex, maturity status and stomach contents of the catch and a sample of squid was aged by counting putative, daily microgrowth increments in the sectioned statolith. All squid were caught by jigs operating at depths from 80 to 100 m to the surface. Catch per unit of effort per drift varied between 1.0 and 21.9 kg min−1 and there was no by-catch. Greatest numbers of squid were caught at dusk and dawn. Mantle length fell in the range 220–350 mm (males) and 212–370 mm (females). Most males were sexually mature (Lipinski's stages IV–V) and most females were immature (stage II). The absence of mature females suggests that no spawning takes place in this area during the austral winter. The squid were up to 1␣year of age and had hatched during the previous winter. They were apparently from the same cohort as had been sampled at the Antarctic Polar Front in February 1996. Myctophids were the major prey in the stomach contents and the squid Gonatus antarcticus was also important; crustaceans were relatively unimportant. The results suggest that concentrations of Martialia hyadesi are present in the vicinity of South Georgia, south of the Antarctic Polar Front, during the austral winter. The squid are actively feeding during the austral winter and are susceptible to jigging gear.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003000050239
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    Paper (German National Licenses)
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  • 3
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    Growth of cultured Octopus mimus (Cephalopoda, Octopodidae) (1999)
    Elsevier
    In:  Fisheries Research, 40 (1). pp. 81-89.
    Details
    Publication Date: 2021-06-17
    Description: Laboratory rearing of 19 Octopus mimus from 40 to 589 g at 20.1±1.8°C (September to December 1991) provided information on the growth pattern and variation in instantaneous relative growth rate (G) of this Chilean littoral octopus. The three smallest specimens (ranging from 40 to 49.8 g) attained an average weight of 558 g in 70 days. Growth of this species had two phases. Growth was exponential during the first 40 days of culture with an average G of 5.33%. It slowed and became logarithmic when the animals attained weights ranging from 326.6 to 439 g. Instantaneous relative growth rate decreased from 2.25% to 0.99% during the logarithmic phase. A similar pattern was found for the 16 larger specimens (61.4–406.4 g initial weight). The change in growth pattern observed between the exponential and logarithmic phases occurred at body weights ranging from 326.6 to 454.2 g. No differences in growth were found between sexes in O. mimus. The growth pattern of this species is discussed and compared to other small-egged octopus species raised in captivity.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1016/S0165-7836(98)00203-3
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  • 4
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    Growth of Octopus mimus (Cephalopoda, Octopodidae) in wild populations (1999)
    Elsevier
    In:  Fisheries Research, 42 (1-2). pp. 31-39.
    Details
    Publication Date: 2021-06-15
    Description: A total of 6171 specimens of Octopus mimus was collected from the commercial small-scale fishery in northern Chilean waters (off Iquique) between January 1991 and March 1992. The animals were grouped by sex, size and month for modal progression analysis (MPA). Total length of the animals ranged from 24 (66 g) to 107 cm (4358 g) for males and from 28 (63 g) to 115 cm (3714 g) for females. There were no significant differences in the length–weight relationship between sexes except in summer. The size structure of the exploited population of O. mimus is rather complex and MPA indicated six sub-annual cohorts for males and five for females. Instantaneous relative growth rate (G) in total body weight varied from 0.29% to 1.37% d−1 and from 0.23% to 1.78% d−1 for males and females, respectively. Seasonality and water temperature affected G in both sexes. Differences in G among sub-annual cohorts within the same season were found and it was observed that G tended to decrease with size.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1016/S0165-7836(99)00040-5
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  • 5
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    Description of Genesis vulcanoctopusi gen. et sp. nov. (Copepoda: Tisbidae) parasitic on a hydrothermal vent octopod and a reinterpretation of the life cycle of cholidyinid harpacticoids (2000)
    Station Biologique de Roscoff
    In:  Cahiers de Biologie Marine, 41 (3). pp. 241-253.
    Details
    Publication Date: 2021-06-24
    Description: Juveniles and adult females of Genesis vulcanoctopusi gen. et sp. nov. (Copepoda: Harpacticoida) are described from the deepwater octopus Vulcanoctopus hydrothermalis, collected from a hydrothermal vent in the East Pacific Rise. The new genus is placed in the Tisbidae and is readily distinguishable from other Cholidyinae by the combination of body shape, structure of oral appendages and segmentation of legs 1-5. All stages were found embedded in the integument of the head and mantle of the cephalopod host, suggesting an endoparasitic copepodid phase. The generalized life cycle of cholidyinid harpacticoids is reinterpreted in the light of this discovery. Aspects of parasitism and pathological effects of G. vulcanoctopusi on the octopod host are discussed.
    Type: Article , PeerReviewed
    Format: text
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  • 6
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    Effect of parasitism on the productivity of the ommastrephid stocks in Galician waters (NW Spain): economic loss = Efecto del parasitismo en la productividad de los stocks de omastréfidos en aguas de Galicia: pérdidas económicas (1998)
    Sociedad Española de Malacología
    In:  Iberus, 16 (2). pp. 95-98.
    Details
    Publication Date: 2021-06-22
    Description: The economic loss due to the effect of parasitism of the ommastrephid stocks are estimated using the interannual values of prevalence of infestation by Pennella sp. in the ommastrephid stocks of Illex coindetii and Todaropsis eblanae in the Galician coast. Parasitism of Pennella sp. implies about 2.1% and 8.1% of the variation in condition of the ommastrephids, reducing the condition of I. coindetii and T. eblanae over 8.8% and 21.1%, respectively. It was estimated that the reduction in biomass of infested squid were 143 and 527 tonnes for I. coindetii and T. eblanae, respectively for the period 1980-1991. Assuming an average value of 125 ptas/kg of squid, the annual economic loss for the fishery sector due to the infested stock is thus estimated in some 84 millions ptas for the period 1980-1991. This overview highlights that parasitism is not only an important zoonotic problem but an important economic problem at the time of management of infested stocks.
    Type: Article , PeerReviewed
    Format: text
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  • 7
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    Validation of a semi-automatic image analysis system to age squids and its application to ageIllex coindetiistatoliths (1998)
    International Council for the Exploration of the Seas
    In:  ICES Journal of Marine Science, 55 (3). pp. 535-544.
    Details
    Publication Date: 2021-06-15
    Description: The validity of a semi-automatic image analysis system employing digital image enhancement was demonstrated by re-analysing a set of previously analysed, known-age Sepioteuthis lessoniana statoliths. Linear regression models using both the manual and semi-automatic growth increment counts successfully predicted the true age of the test statoliths to a high degree of accuracy and precision and fully supported the one increment per day hypothesis. Thus this set of known age statoliths served as a reference standard for the counting method. After “calibrating” the semi-automatic image analysis system with the reference standards the method was then used to determine the ages of a large (n=312) set of Illex coindetii statoliths of unknown age. The results of this analysis were less clear than the S. lessoniana analysis. The semi-automatic counts predicted mantle lengths (ML) more precisely than did the manual counts. Significant differences were found between the two counting methods. For the Illex data set, the linear model to estimate ML from putative age predicted negative y-intercept values for both sexes and counting methods. Thus a power function model was selected as the more biologically meaningful predictor of ML. The accuracy of the I. coindetii analysis cannot be determined as the daily increment hypothesis remains to be verified for this species.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1006/jmsc.1997.0343
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  • 8
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    Fishery biology of the seven star flying squid Martialia hyadesi at South Georgia during winter (1998)
    Springer
    In:  Polar Biology, 19 (4). pp. 231-236.
    Details
    Publication Date: 2021-04-22
    Description: A scientific research fishing expedition targeting the oceanic/slope ommastrephid squid Martialia hyadesi was undertaken by a Korean-registered squid jigger in CCAMLR area 48.3, near South Georgia, in June 1996, providing the first opportunity to collect data on the fishery biology of this species during the austral winter. Fishing took place over a period of 8 days; a series of eight drifts was undertaken along an approximately east/west transect of about 200 nautical miles to the north and west of South Georgia, over depths ranging from 1,700 to 2,713 m. All fishing was to the south of the Antarctic Polar Front. Data were collected on sea surface temperature, catch per unit of effort, size, sex, maturity status and stomach contents of the catch and a sample of squid was aged by counting putative, daily microgrowth increments in the sectioned statolith. All squid were caught by jigs operating at depths from 80 to 100 m to the surface. Catch per unit of effort per drift varied between 1.0 and 21.9 kg min−1 and there was no by-catch. Greatest numbers of squid were caught at dusk and dawn. Mantle length fell in the range 220–350 mm (males) and 212–370 mm (females). Most males were sexually mature (Lipinski's stages IV–V) and most females were immature (stage II). The absence of mature females suggests that no spawning takes place in this area during the austral winter. The squid were up to 1␣year of age and had hatched during the previous winter. They were apparently from the same cohort as had been sampled at the Antarctic Polar Front in February 1996. Myctophids were the major prey in the stomach contents and the squid Gonatus antarcticus was also important; crustaceans were relatively unimportant. The results suggest that concentrations of Martialia hyadesi are present in the vicinity of South Georgia, south of the Antarctic Polar Front, during the austral winter. The squid are actively feeding during the austral winter and are susceptible to jigging gear.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1007/s003000050239
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  • 9
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    Graneledone gonzalezi sp. nov. (Mollusca: Cephalopoda): a new octopod from the Îles Kerguelen (2000)
    Cambridge University Press
    In:  Antarctic Science, 12 (1). pp. 33-40.
    Details
    Publication Date: 2021-06-25
    Description: A new octopod species, Graneledone gonzalezi sp. nov., is described from 19 specimens collected off the northern Îles Kerguelen. This is a bathyal octopus which is characterized by: the absence of supra-ocular papillae, short arms, a long ligula without copulatory ridges, a narrow head, six filaments per outer demibranch and radula exhibiting no archaic traits, medium size oocytes and a low number of very long spermatophores. Graneledone gonzalezi is compared with its other congeneric species and found most closely resemble G. antarctica . The geographic and bathymetric distribution of G. gonzalezi is also discussed.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1017/S0954102000000055
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  • 10
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    Reproductive biology of the short-finned squid Illex coindetii (cephalopoda, ommastrephidae) of the Northeastern Atlantic (1996)
    Taylor & Francis
    In:  Sarsia, 81 . pp. 107-118.
    Details
    Publication Date: 2020-11-16
    Description: For the purpose of this study, 5 311 post recruit of Illex coindetii were collected from the fishery of the Galician shelf, with sizes ranging from 32 to 379 mm dorsal mantle length (ML). Samples were taken monthly from November, 1991 to October, 1992. Sexual maturation, spawning season and population structure of Illex coindetii were analyzed. The spawning season extended throughout the year reaching a peak in July-August, with size at first maturity in males, 128 mm ML and in females, 184 mm ML. Males mature at a smaller size and attain lower size (279 mm ML) than females (379 mm ML). The sex ratio of the whole population sampled was slightly biased towards males, nevertheless monthly variations observed and the ratio obtained (1.09 : 1) does not suggest that there is spatial segregation by sexes in the fishing ground. From the total sample, 185 males and 281 females, covering the whole range of ML's, were randolmy separated out to calculate maturation indices. A correlation between the subjective scales and the values of these indices was established in both sexes. The nidamental gland length proved to be a reliable parameter for distinguishing between stages of maturity in females. The fecundity of the species varied between 3 500 and 285 000 oocytes, (the most frequent range being from 30 000 and 200 000 oocystes) in the ovary and the oviducts. The principal axis in the oviduct contained 2 331 ± 912 eggs. The number of spermatophores in the spermatophoric sac varied between 81 and 1 555, and it was observed that the number and the length of the spermatophores tended to increase with size of the males. Illex coindetii may be considered as an intermittent spawner.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1080/00364827.1996.10413616
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