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  • 1
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    Biological variation in Eledone cirrhosa (Cephalopoda:Octopoda): simultaneous comparison of North Sea and Mediterranean populations (1988)
    Institute of Malacology
    In:  Malacologia, 29 (1). pp. 77-87.
    Details
    Publication Date: 2020-07-15
    Description: Reproductive maturity and morphometric characteristics were compared for two samples of the octopus Eledone cirrhosa from geographically widely separated sites, Aberdeen, Scotland (320) and Banyuls, France (285).At the two locations the collecting period was synchronized (13 months) and laboratory procedures standardized. In both samples the sex ratio was strongly biased to females, which were about twice the body size of the males. Both sexes were significantly larger in the northern population. Analysis of a limited selection of morphometric characters (mantle, arms, brain and body weight) showed significant differences, but these were insufficient to confirm any divergence in body shape between the two populations.
    Type: Article , PeerReviewed
    Format: text
    Location Call Number Limitation Availability
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 2
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    Sexual maturation in the octopus Eledone cirrhosa Lamarck (1982)
    Institute of Malacology
    In:  Malacologia, 22 (1-2). pp. 189-196.
    Details
    Publication Date: 2020-07-15
    Description: Studies of sexual maturation have been made on a large sample of Eledone cirrhosa from the North Sea off Aberdeen, Scotland. In females the wet weights of the ovary and oviducal glands have been recorded for a wide range of body sizes and related to the total body weight. The length dlstribution of a sample of eggs from each ovary was also measured. Assessed either by ovary enlargement or the mean egg length, female E. cirrhosa become mature at a wide ränge of body size and so state of maturity is not predictable from size of the animal. In males the total weight of genital bag is, by contrast, clearly correlated with body weight although this is not true for testis alone, presumably because of transfer of sperm from testis to spermatophoric sac.
    Type: Article , PeerReviewed
    Format: text
    Location Call Number Limitation Availability
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 3
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    Sources of evidence for salmon in the diet of seals (1990)
    Elsevier
    In:  Fisheries Research, 10 (1-2). pp. 137-150.
    Details
    Publication Date: 2020-07-31
    Description: Feeding trials in which salmon was fed to captive seals are described and sources of evidence for the presence of salmon in the diet of seals are evaluated. In faecal samples, the recovery rate of salmon otoliths is too low and bony remains are too fragmented to be useful. Protein extracts from the faeces of salmon-fed captive seals will react with anti-salmon antisera, but the reaction is not strong enough for the methods to be presently applied to field samples. In the digestive tract samples from seals, the use of bony remains for the identification of salmon significantly increases the probability of recognising this species. Protein extracts from digestive tract contents will react positively with anti-salmon antisera and this shows that serological methods can provide evidence for the presence of Salmonidae in the diet of seals, in the absence of solid remains.
    Type: Article , PeerReviewed
    Format: text
    Location Call Number Limitation Availability
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    OceanRep: Article in a Scientific Journal - peer-reviewed
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