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  • Cambridge University Press  (11,417)
  • 1995-1999  (11,417)
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  • 11
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    Geographical variation in growth and maturation of the squid illex coindeth (Oegopsida, Ommastrephidae) off the north-west African coast (1996)
    Cambridge University Press
    In:  Journal of the Marine Biological Association of the United Kingdom, 76 (4). pp. 1091-1106.
    Details
    Publication Date: 2021-06-23
    Description: Statolith microstructure was studied in 162 specimens of Illex coindetii (mantle length ranging from 48 to 300 mm) captured on the shelves of Sierra Leone and Western Sahara between May and November 1987. Growth increments were revealed in all statoliths studied, but they were not well-resolved as in other congeneric species Illex illecebrosus and Illex argentinus . Age and growth rates were estimated assuming that growth increments within statoliths were produced. In both regions, differences in growth rates between sexes (females become larger than males) occurred first in length and then in weight. Geographical differences in sex-specific growth (Western Sahara squid grow faster and attain larger sizes than Sierra Leone squid) was apparent after 150 d in females and 120 d in males. Illex coindetii in Sierra Leone started maturing at smaller sizes but at approximately the same age as the Western Sahara squid. Small sized early maturing groups of I. coindetii with a life span of ~0.5 y occurred in both regions. However, large sized late maturing squid with a life span of ~1 y were encountered only in the Western Sahara. In waters of the west African shelf, I. coindetii spawn throughout the year.
    Type: Article , PeerReviewed
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  • 12
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    Diet of the European flying squid Todarodes sagittatus (Cephalopoda: ommastrephidae) in the Balearic Sea (western Mediterranean) (1999)
    Cambridge University Press
    In:  Journal of the Marine Biological Association of the United Kingdom, 79 (3). pp. 479-486.
    Details
    Publication Date: 2021-06-17
    Description: Stomach contents of Todarodes sagittatus caught by trawlers working from 100 to 800 m depth in the Balearic Sea (western Mediterranean) were studied. From the 348 stomachs examined (153 males and 195 females) 33.62% were empty (39.21% in males and 29.74% in females). The diet of the squid was composed of 58 different prey items belonging to four major groups: Osteichthya, Crustacea, Cephalopoda and Chondrichthya. Osteichthyes, crustaceans and cephalopods were the most common prey, with a frequency of occurrence value of 84.85, 48.92 and 29.87% respectively. A change in the diet as the squid grows was observed, since juveniles feed basically on fishes while adults prey more actively on crustaceans. Analysis of the diet by size-classes reflected an ontogenetic migration to deeper waters since, parallel to the increase of size, a raise in the percentage of prey species inhabiting deeper waters was detected. Cannibalism was quite frequent, since T. sagittatus was the second most common cephalopod prey. Females had higher fullness-weight index and lower emptiness index than males, which reflects their major energetic demand for egg production.
    Type: Article , PeerReviewed
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  • 13
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    Size selectivity in the diet of Loligo forbesi (Cephalopoda: Loliginidae) (1996)
    Cambridge University Press
    In:  Journal of the Marine Biological Association of the United Kingdom, 76 (4). pp. 1081-1090.
    Details
    Publication Date: 2021-06-15
    Description: The size of fish and squid prey of Loligo forbesi was investigated using otoliths, beaks and statoliths collected from stomach contents analysis of samples obtained from Scottish and Irish waters between 1990 and 1993. Loligo forbesi was found to consume a large range of prey sizes, but prey size was always less than the predator size. Season was shown to significantly influence the predator size-prey size relationship for sprat and sandeel prey, but this itself could be influenced by seasonal changes in the size of prey. Fish prey size increased with increased predator size up to a mantle length (ML) of 200 mm. Loligo forbesi of mantle length 〉200 mm consumed a range of prey sizes, with no clear increase in the size of prey. For most prey taxa the relationship between prey size and squid size was similar, the exceptions being dragonets and silvery pout. Cannibalism by L. forbesi was mostly limited to larger L. forbesi (〉150 mm ML) feeding on smaller (20–50 mm ML) conspecifics.
    Type: Article , PeerReviewed
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  • 14
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    Population structure and growth of the squid Todarodes sagittatus (Cephalopoda: Ommastrephidae) in north-west African waters (1999)
    Cambridge University Press
    In:  Journal of the Marine Biological Association of the United Kingdom, 79 (3). pp. 467-477.
    Details
    Publication Date: 2021-06-11
    Description: The population structure of the European flying squid Todarodes sagittatus was studied using data of about 5000 squid caught in waters off the western Sahara between 1969 and 1997. The bulk of the population consisted of winter-spawned squid, which occurred as juveniles of 80–120 mm mantle length (ML) over the slope in spring, and as immature squid of 160–180 mm ML both on the shelf and slope in summer. In autumn, the squid attained 220–280 mm ML, matured, and shifted to the slope, where the spawning was supposed to occur in winter. Age and growth of T. sagittatus was studied using statolith ageing techniques. Assuming daily production of putative growth increments within statoliths, as well as sizes and proportions of immature and maturing females, the lifespan of the west Saharan populations of T. sagittatus lasts ∼1 y. Todarodes sagittatus is a fast growing squid at juvenile and immature ontogenetic phases. Early maturation (at ages 220–230 d in males and 250–260 d in females, respectively) and subsequent decrease of somatic growth rates caused rather small modal sizes of mature squid (250–300 mm ML) compared with those of their northern counterparts (350–420 mm ML). Both hatching dates and seasonality in occurrence of mature females shows that in waters off the western Sahara T. sagittatus spawns throughout the year with a well-pronounced winter peak.
    Type: Article , NonPeerReviewed
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  • 15
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    Egg size and fecundity in females of the subfamilies Todaropsinae and Todarodinae (Cephalopoda: Ommastrephidae) (1999)
    Cambridge University Press
    In:  Journal of the Marine Biological Association of the United Kingdom, 79 (3). pp. 569-570.
    Details
    Publication Date: 2021-06-11
    Description: Size of ripe eggs and potential fecundity are described in the squid of the subfamilies Todaropsinae and Todarodinae (Oegopsida: Ommastrephidae)— Todaropsis eblanae from West Africa, Todarodes angolensis from Namibia, Todarodes sagittatus from north-west Africa and the Mediterranean Sea, Todarodes sp. from the south-east Pacific, Nototodarus hawaiiensis from the south-east Pacific and West Indian Ocean and Martialia hyadesi from the south-west Atlantic. Females of both subfamilies are characterized by a wide range of ripe egg size (0.7–2.4 mm) and low and medium values of potential fecundity (20,000–2,500,000).
    Type: Article , PeerReviewed
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  • 16
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    New Records of Cephalopods Caught in Irish and Scottish Waters (1997)
    Cambridge University Press
    In:  Journal of the Marine Biological Association of the United Kingdom, 77 (2). pp. 561-564.
    Details
    Publication Date: 2021-05-06
    Description: Records of unusual cephalopods, taken as by-catch in Irish and Scottish waters in the years 1985–1995, are presented. Of most interest are three specimens of giant squid (Architeuthis) that were caught in bottom trawls off the west of Ireland between April and June 1995, all were mature males of mantle length ∼1000 mm. Other records include a large mature female Histioteuthis bonnellii from the west of Ireland and three specimens of the gelatinous incirrate octopus, Haliphron atlanticus.
    Type: Article , PeerReviewed
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  • 17
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    Correlates of growth and feeding in laboratory-maintained Eledone cirrhosa (Cephalopoda: Octopoda) (1998)
    Cambridge University Press
    In:  Journal of the Marine Biological Association of the United Kingdom, 78 (3). pp. 919-932.
    Details
    Publication Date: 2021-05-05
    Description: Octopuses ( Eledone cirrhosa (Octopoda: Cephalopoda)) held in an aquarium were subjected to varying conditions of feeding and starvation to evaluate putative indices of feeding and growth. Specific growth rate (%d −1 ) was linearly related to feeding rate (% of the body mass d −1 ) in animals with a mean body mass of 250 g at 15°C. Maximum growth rates varied between 〉 2% d −1 (body weights 〈 300 g) to 〈 1% d −1 (body weights ≤ 900 g) but specific growth rates were not related to body weight. Growth rates became negative (weight loss) after one week without food. The digestive gland index (DGI) was significantly correlated with short and long-term feeding and specific growth rates, and with body weight. Muscle RNA concentration was linearly correlated with growth rate during the previous 1–3 weeks but not with feeding rate. RNA:protein ratios were not different between mid-arm and mantle sample sites but arm tip values were significantly higher. RNA:protein ratio was related to body weight only in feeding animals. It is concluded that DGI is an index of feeding rate and that RNA:protein ratio can be used as an index of recent (~ 4 weeks) growth rate.
    Type: Article , PeerReviewed
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  • 18
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    Chaunoteuthis mollis: re-examination of a Mediterranean specimen and its identity with Onychoteuthis banksii (Cephalopoda: Onychoteuthidae) (1998)
    Cambridge University Press
    In:  Journal of the Marine Biological Association of the United Kingdom, 78 (3). pp. 1027-1030.
    Details
    Publication Date: 2021-05-05
    Description: A specimen of Chaunoteuthis mollis (Cephalopoda: Onychoteuthidae), a mature mated female, from the Straits of Messina was examined. Measurements and indices were compared with those of Onychoteuthis banksii reported by previous authors. The differences found were attributed to the degeneration of the C. mollis specimen, due to sexual maturation. Two subocular (one under each eye) and two visceral photophores, similar to those of O. banksii , were present in the C. mollis specimen. The size of the posterior visceral photophore of C. mollis fit the regression line correlating posterior photophore diameter to mantle length in O. banksii. These results corroborate the hypothesis, put forward by other authors, that C. mollis represents the mature female of O. banksii.
    Type: Article , PeerReviewed
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  • 19
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    Observations on morphology, age and diet of three Architeuthis caught off the west coast of Ireland in 1995 (1998)
    Cambridge University Press
    In:  Journal of the Marine Biological Association of the United Kingdom, 78 (3). pp. 903-917.
    Details
    Publication Date: 2021-05-05
    Description: Three specimens of the giant squid Architeuthis were by-caught in demersal trawls to the west of Ireland, between April and June 1995. All three specimens were mature males, of mantle length 975–1084 mm. Although some intraspecific variation in fin, beak and gill were noticed, all three specimens were tentatively assigned to the species A. dux. The three specimens had food remains in their stomachs and food items identified included Micromesistius poutassou, Trachurus trachurus, Nephrops norvegicus and Eledone cirrhosa . Age estimates were made by counting putative daily growth increments in ground statoliths, and ranged from 294–122 d, giving percentage daily growth rates of 2·96–4·25% indicating a short life cycle and extremely rapid growth.
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  • 20
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    The cephalopod by-catch of deep-water trawling on the Hebrides slope (1998)
    Cambridge University Press
    In:  Journal of the Marine Biological Association of the United Kingdom, 78 (3). pp. 1023-1026.
    Details
    Publication Date: 2021-05-05
    Description: Deep-water trawling for fish species on the shelf slope off Scotland results in a by-catch of rare cephalopod species. The cirrate octopus Opisthoteuthis grimaldii is normally present below 800 m; at least one other species of cirrate and five species of incirrate octopus are found; significant extensions of range and depth are recorded. An incidental catch of the ommastrephid squid, Todarodes sagittatus , included a fully mature specimen and is indicative of its probable breeding locations. The results highlight the many taxonomic and systematic uncertainties surrounding the rarer cephalopod forms, and emphasize the utility of the fishing by-catch.
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