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  • 1
    Book
    Book
    Cephalopod life cycles (1983-)
    London [u.a.] : Academic Press
    Details Availability
    Type of Medium: Book
    Language: English
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  • 2
    Online Resource
    Online Resource
    Cephalopods : ecology and fisheries (2005)
    Ames, Iowa : Blackwell Science
    Details Availability
    Keywords: Squid fisheries ; Octopus fisheries ; Cephalopoda ; Squid fisheries ; Cephalopoda ; Octopus fisheries
    Description / Table of Contents: 1. Introduction -- 2. Form and function -- 3. Origin and evolution -- 4. Nautilus : the survivor -- 5. Biodiversity and zoogeography -- 6. Life cycle -- 7. Growth -- 8. Physiological ecology -- 9. Reproduction -- 10. From egg to recruitment -- 11. Coastal and shelf species -- 12. Oceanic and deep-sea species -- 13. Population ecology -- 14. Cephalopods as predators -- 15. Cephalopods as prey -- 16. Fishing methods and scientific sampling -- 17. Fishery resources -- 18. Fisheries oceanography -- 19. Assessment and management -- 20. Conclusion -- App. A. Classification of living cephalopod families -- App. B. Synopsis of living cephalopod families.
    Type of Medium: Online Resource
    Pages: 1 Online-Ressource (xii, 452 pages) , illustrations (some color), maps (some color)
    ISBN: 0470995319 , 0632060484 , 9780470995310 , 9780632060481
    URL: https://onlinelibrary.wiley.com/doi/book/10.1002/9780470995310
    DOI: 10.1002/9780470995310
    Language: English
    Note: Includes bibliographical references (pages 373-438) and index
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  • 3
    Book
    Book
    Guide to the identification of North Sea Fish using Premaxillae and Vertebrae (1997)
    [Copenhagen] : Internat. Council for the Exploration of the Sea
    Details Availability
    Keywords: Nordsee ; Fische ; Zwischenkiefer ; Wirbelsäule ; Systematik
    Type of Medium: Book
    Pages: VII, 231 S , Ill., graph. Darst
    Series Statement: ICES cooperative research report 220
    URL: http://www.gbv.de/dms/tib-ub-hannover/230980074.pdf
    DDC: 597.177/336
    Language: English
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  • 4
    Electronic Resource
    Electronic Resource
    Genetic variation in the neritic squid Loligo forbesi (Myopsida: Loliginidae) in the northeast Atlantic Ocean (1995)
    Springer
    Marine biology 122 (1995), S. 79-86 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Horizontal starch gel electrophoresis was employed to investigate levels of genetic differentiation between 13 samples of the neritic squid species Loligo forbesi Steenstrup obtained from throughout the majority of its known geographical range. Six enzyme loci identified in a preliminary study as being polymorphic were screened for variation between samples. No significant differences in allele distribution were detected between any of the samples obtained from the Faroe Bank in the north to Lisbon in the south, suggesting that squid throughout this range in the vicinity of the continental shelf are able to maintain panmixia, and effectively belong to a single population sharing a common gene pool. No clinal variation in allele distribution was detected throughout this range, a result which complements the findings of a detailed morphological companion study of the same individuals. Comparison of this homogenous European continental shelf population with squid from the Azores revealed highly significant (P〈0.01) differences in allele distribution at five of the six polymorphic enzyme loci studied. A genetic identity value (I) equivalent to 0.93 over 33 loci was obtained. Analysis of F-statistics suggested migration rates between sites to be as low as one individual per five generations, a rate deemed insufficient under most models to prevent divergence by random genetic drift. The large distance and oceanic depths separating the Azores from continental Europe seem to present an effective barrier to gene flow to L. forbesi, a squid belonging to a family considered to be confined in distribution to relatively shallow, near coastal waters. The two populations of squid in the Azores and along the European continental shelf currently both ascribed to L. forbesi should therefore probably best be regarded as relative subspecies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00349280
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  • 5
    Electronic Resource
    Electronic Resource
    Flexible reproductive strategies in the squid Loligo forbesi (1995)
    Springer
    Marine biology 121 (1995), S. 501-508 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Body size at sexual maturity, egg-size distributions, and potential reproductive output have been estimated for female and male squid, Loligo forbesi Steenstrup, off the west coast of Scotland. Two size modes at maturity were found in both sexes, but separation into size cohorts was more pronounced in males (180 and 350 mm mantle length, ML). Preliminary ageing studies based on statolith ring-counts suggest that these size modes are not due to different age groups at breeding. Females have a single size mode of mature eggs in the proximal oviduct, but may have at least two size modes of eggs within the ovary. This finding is interpreted as evidence of batch-spawning in this squid. There was a weak relationship between total egg numbers (range 1000 to 16000) and body size (range 196 to 318 mm ML) and between mature egg size and body size. Males showed a strong positive relationship between spermatophore length and body length but a weak relationship between total number of spermatophores and body size. The results are discussed in the context of flexibility of breeding strategies in the loliginids and variety of life-cycle patterns.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00349459
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  • 6
    Electronic Resource
    Electronic Resource
    Fecundity and spawning in a deep-water cirromorph octopus (2000)
    Springer
    Marine biology 137 (2000), S. 317-324 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  Reproductive characteristics of cirromorph octopuses, assigned to the species Opisthoteuthis grimaldii, were sampled as a commercial fishing by-catch on the Hebrides Slope, west of Scotland. A total of 254 specimens (99 female, 155 males), retrieved from bottom trawls fished at 750 to 1500 m depth, were examined. A maximum of 2097 eggs was counted in a single female ovary (mean female body weight 1242.8 g), most of them 〈1 mm in length. At egg lengths over 1 mm, diminishing numbers of eggs were present in 1 mm size categories up to a maximum of ≈10 mm. At body sizes 〉500 g (wet wt), and in every female 〉750 g (max. female weight recorded in the sample was 2959 g), a succession of unattached eggs was present in the proximal oviduct and a single, unattached mature egg occupied the tip of the distal oviduct. These females were assumed to be in spawning condition and the characteristics of egg distribution in the reproductive tract to be consistent with sequential release of individual eggs and continuous spawning throughout the growth period and lifespan of the mature octopus. In pre-spawning females there was a positive relationship between estimated egg numbers and maximum egg size. After the onset of spawning there was no significant further increase in estimated potential fecundity over the body-size range 500 to 3000 g. Follicular sheaths remaining in the ovary after release of eggs into the proximal oviduct were counted and used to estimate the total number of eggs released up to the time of capture. Follicular sheaths first appeared at 500 to 650 g body weight and increased steeply in number to 〉1000 in females 〉1500 g. Two individuals were found with ovarian follicular sheaths but with no terminal egg in the distal oviduct; these were assumed to have released their egg just before capture. Summation of the number of follicular sheaths counted plus the number of eggs estimated as remaining attached in the ovisac, provided a revised estimate of total potential fecundity and raised the estimate for any individual to a maximum of 3202 eggs (mean = 1396 eggs).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002270000351
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  • 7
    Electronic Resource
    Electronic Resource
    Geographic variation in Loligo forbesi in the Northeast Atlantic Ocean: analysis of morphometric data and tests of causal hypotheses (1994)
    Springer
    Marine biology 119 (1994), S. 541-547 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Geographic variation in the squid Loligo forbesi was investigated using multivariate analysis of morphometric and meristic characters in samples of squid taken from 13 localities in the Northeast Atlantic Ocean. Two character sets, body morphometrics and beak morphometrics, indicated similar patterns of variation, with squid from the Azores differing markedly from those on the continental shelf. No consistent pattern was apparent in meristic data. Partial Mantel tests indicated that similarity matrices for morphological data were significantly correlated with distance matrices for (a) geographic proximity, (b) whether the capture site was on the continental shelf or the Azorean bank, and (c) (beak data only) average seasurface temperature at site of capture. Partial Mantel tests on allozyme data for the same individuals support hypothesis (b). The results suggest that L. forbesi in the Azores may reasonably be regarded as a distinct stock, differing significantly from L. forbesi on the continental shelf.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00354316
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  • 8
    Electronic Resource
    Electronic Resource
    Optic gland enlargement and female gonad maturation in a population of the octopuseledone cirrhosa: a multivariate analysis (1984)
    Springer
    Marine biology 79 (1984), S. 127-132 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Eleven principal component analyses were performed on morphometric data from a series of monthly samples of the octopusEledone cirrhosa (Lamarck) collected from March 1978 through January 1979 in the Aberdeen (Scotland) area. This technique has allowed a partitioning of general growth effects from variation in the reproductive system. Optic gland size varies as a reproductive character together with ovary and oviducal glands. Optic gland size not clearly associated with other cerebral organs, the brain and optic lobes. The association between the reprountive characters developed during the onset of the main period of reproductive maturation in the early summer of 1978 and persisted for the remainder of that year. This result supports the experimental evidence linking optic gland enlargement with female gonad maturation and suggests that this process occurs normally in the field population.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00951821
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  • 9
    Electronic Resource
    Electronic Resource
    Digestive tract contents of seals in the Moray Firth area of Scotland (1989)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 35 (1989), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.1989.tb03081.x
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  • 10
    Electronic Resource
    Electronic Resource
    Rhabdomeric Ocellus in a Chiton (1969)
    [s.l.] : Nature Publishing Group
    Nature 222 (1969), S. 895-896 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Onithochiton neglectus Rochbrune, 1881, a common New Zealand chiton, possesses ocelli (extrapigmental type) in large numbers on the dorsal shell layer. Light microscopy of decalcified sections12 showed these ocelli to be similar in structure to those previously described5. The ocellus lies ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/222895a0
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