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  • Aberdeen University Press  (1)
  • Cambridge Univ. Pr.  (1)
  • Oxford Univ. Press  (1)
  • 1
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    Resolution of multiple cohorts in the Loligo forbesi population from the west of Scotland (1999)
    Oxford Univ. Press
    In:  ICES Journal of Marine Science, 56 (4). pp. 500-509.
    Details
    Publication Date: 2021-06-17
    Description: Length–frequency analysis was employed to resolve multiple cohorts in the Loligo forbesi population from coastal waters to the west of Scotland. In both male and female squid two principal cohorts were identified, recruiting to the fished population in April and November. Both cohorts spawned during the winter months (November to April), producing a single extended spawning season, with the April recruits of larger size at spawning than the November recruits. In the males the April recruits appeared to separate into two cohorts of different growth rates, thus producing three rather than two sizes at maturity. The abundance of L. forbesi was low during the summer months, indicating that the squid had moved outside the range of the fishery, perhaps into deeper water. Abundance declined during the spawning season, which is interpreted as post-spawning mortality. Abundance declined earlier in the males than females, producing a female biased sex ratio during most of the spawning season. The two periods of recruitment are not compatible with a 1 year life cycle and single extended spawning season and explanations of this are discussed.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1006/jmsc.1999.0485
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 2
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    Factors affecting prey handling in lesser octopus (Eledone cirrhosa) feeding on crabs (Carcinus maenas) (1999)
    Cambridge Univ. Pr.
    In:  Journal of The Marine Biological Association of The United Kingdom, 79 (6). pp. 1085-1090.
    Details
    Publication Date: 2021-06-25
    Description: Octopuses (Eledone cirrhosa) feeding on crabs (Carcinus maenus) may penetrate the crab by a carapace borehole or puncture of the eye. In ad libitum feeding trials (632 crabs eaten), 31% of the predated crabs had a punctured eye, 57% had a borehole in the dorsal carapace. Eye puncture and boring occurred together in 6% of cases but 18% were neither punctured nor bored. Feeding trials in which size of prey and size of octopus were controlled showed that the incidence of boreholes was greatest (〉70%) in small crabs (〈50 mm carapace width). Incidence of eye puncture (10% in small crabs) rose to 25% in crabs of over 50 mm carapace width and to over 40% in the largest crabs used (65–80 mm carapace width). Large octopuses used eye puncture less frequently than small octopuses. Increasing the proportion of small crabs in the diet increased the subsequent incidence of carapace boring at all crab sizes. The results are discussed in relation to differences in prey handling efficiency at different prey sizes.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1017/S0025315499001332
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 3
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    Prey handling and salivary secretions in octopuses (1990)
    Aberdeen University Press
    In:  In: Trophic Relationships in the Marine Environment : Proceedings of the 24. European Marine Biology Symposium. , ed. by Barnes, M. and Gibson, R. N. Aberdeen University Press, Aberdeen, pp. 541-552.
    Details
    Publication Date: 2020-01-17
    Description: Octopuses are known to be highly efficient at the extraction of flesh from their crustacean prey. Experiments on capture and handling of crabs (Carcinus maenas) by the octopus Eledone cirrhosa show that paralysis of the crab invariably precedes hole boring of the carapace. The time course of feeding is described and it is shown that the ingestion of crab meat does not occur before about 40 min after capture for this specific predator-prey interaction although crabs are paralysed after 1-5 min. Comparative observations on hole-boring behaviour are given for Octopus vulgaris and O. dofleini. The results are discussed in relation to recent data on the biochemical composition of the secretions of the posterior salivary gland.
    Type: Book chapter , NonPeerReviewed
    Format: text
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    OceanRep: Book chapter
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