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  • 1
    Electronic Resource
    Electronic Resource
    Evidence of protandry in a subantarctic notothenid, Eleginops maclovinus (Cuv. & Val., 1830) from the Beagle Channel, Argentina (1992)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 40 (1992), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Gonads of Eleginops maclovinus (Cuv. & Val., 1830) from the Beagle Channel (Tierra del Fuego, Argentina) were sampled weekly throughout the year and histologically analysed. Gonads containing solely or mostly testicular tissue were predominant in each length class smaller than 40 cm (80 to 100%). Sex ratio was almost 1:1 in fishes ranging from 41 to 45cm. Females were dominant in specimens larger than 46cm (80 to 100%). Four testicular types are described according to maturation degree and absence or presence of female cells, one intermediate gonadal type and one typical ovarian type. It is concluded that this species is a protandrous hermaphrodite.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.1992.tb02563.x
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  • 2
    Electronic Resource
    Electronic Resource
    Population dynamics of the venerid bivalve Tawera gayi (Hupé, 1854) in the Ushuaia Bay, Beagle Channel (2005)
    Berlin, Germany : Blackwell Verlag GmbH
    Journal of applied ichthyology 21 (2005), S. 0 
    Details
    ISSN: 1439-0426
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Growth, productivity and potential for exploitation of the clam Tawera gayi from shallow waters (3–5 m) of Ushuaia Bay, Beagle Channel were investigated. Mean abundance and biomass in the study area were 1091 ± 737 ind. m−2 and 901.83 g SFWM m−2 (shell-free wet mass), respectively. Individual growth was described best by the von Bertalanffy growth model with the parameter values H∞ = 28.03 mm, K = 0.288 year−1, t0 = −0.34 (r2 = 0.83). Annual production of the population was estimated to be 120.45 g SFWM m−2 year−1, corresponding to a production-to-biomass ratio (P/B) of 0.134 year−1. The single negative exponential mortality model does not fit the population mortality pattern, but predation by gastropods (Xymenopsis muriciformis, Trophon geversianus, Natica sp.) appears to be the major cause of mortality. These highly mobile predators together with the comparatively slow growth and low turnover of T. gayi in Ushuaia Bay limit its potential for sustainable commercial exploitation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1439-0426.2004.00599.x
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  • 3
    Electronic Resource
    Electronic Resource
    Spawning aggregations of Merluccius hubbsi, in Patagonian waters: evidence for a single stock?
    Amsterdam : Elsevier
    Fisheries Research 16 (1993), S. 9-16 
    Details
    ISSN: 0165-7836
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0165-7836(93)90106-H
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  • 4
    Electronic Resource
    Electronic Resource
    Characterization of the nuclear sperm basic proteins in one archaeogastropod: Comparison of protamines between species
    Amsterdam : Elsevier
    Comparative Biochemistry and Physiology -- Part B: Biochemistry and 96 (1990), S. 123-127 
    Details
    ISSN: 0305-0491
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0305-0491(90)90352-T
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  • 5
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    Individual age and connective tissue lipofuscin in the hard clam Eurhomalea exalbida (2002)
    In:  EPIC3Journal of experimental marine biology and ecology, 276, pp. 83-94, ISSN: 0022-0981
    Details
    Publication Date: 2019-07-16
    Description: In the hard clam Eurhomalea exalbida autofluorescent granules were detected in high concentrations in the connective tissue around the intestine and in other tissues. Autofluorescence combined with Sudan Black B and PAS positive reactions suggested that these granules were lipofuscin-like. The concentration of this material in the connective tissue (CT) around the intestine was quantified by image analysis and expressed as total area fraction occupied by lipofuscin granules. Lipofuscin concentration was distinctly better related with individual age as determined from stable isotope validated shell growth bands, than with any morphometric parameter. This relationship was described best by a Gompertz model: Lipofuscint = 24.79 * e -e 0.029 * (Age t 58.578) (N = 38; r2nl = 0.882). Age was predicted from lipofuscinCT concentration by a von Bertalanffy model: Age t = 68.00 * (1 - e -0.146 * (Lipofuscint + 0.028))0.664 (N = 38; r2nl = 0.933). Our findings suggest that lipofuscinCT concentration in E. exalbida is a function of individual age. If this holds true for bivalves in general, lipofuscin may be a suitable proxy for age in species with less clear shell growth band patterns.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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  • 6
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    The reproductive cycle of Eurhomalea exalbida (Chemnitz, 1795) (Bivalvia: Veneridae) in Ushuaia Bay (54°50′ S), Beagle Channel (Argentina) (2002)
    In:  EPIC3Invertebrate reproduction & development, 42(1), pp. 61-68
    Details
    Publication Date: 2019-07-16
    Description: The reproductive cycle of Eurhomalea exalbida (Chemnitz, 1795) in Ushuaia Bay, Beagle Channel, was studied from October 1998 to December 1999. Clams were collected monthly by SCUBA diving at 3 to 5 m water depth. The degree of sexual maturity was determined histologically (n=318). The sex ratio was 1:1 (Chi-squared p 〉 0.05). First sexual maturity occurred at 39 mm shell heigth in males and 40 mm in females (i.e. 4 years of age).Five distinct histological stages of sexual maturity could be established in males: (1) Early Active, (2) Late Active, (3) Ripe, (4) Partially Spawned and (5) Spent. Females had oocytes ranging from small and immature to large and developed in their ovaries throughout the year, hence we could not classify reproductive stages based on a qualitative histological scale of sexual maturity. Therefore, quantitative measures using an image analyzer were used. In males a high percentage of ripe individuals were present between January and August. The percentage of early active and partially spawned individuals was highest in November 1998 (70%) and 1999 (60%). In females, the mean number of developed oocytes per gonadal area, the mean diameter (minor axis) of oocytes, and the percentage of gonadal area occupied by oocytes were lowest in November, indicating a spawning peak. These results indicate synchronous gonadal development and spawning in males and females. The more intensive spawning activity in November coincides with the higher biomass and production of phytoplankton in spring.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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  • 7
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    Growth and production of the venerid bivalve Eurhomalea exalbida in the Beagle Channel, Tierra del Fuego (2002)
    ELSEVIER SCIENCE BV
    In:  EPIC3Journal of Sea Research, ELSEVIER SCIENCE BV, 48, pp. 209-216, ISSN: 1385-1101
    Details
    Publication Date: 2019-07-16
    Description: Growth, mortality and productivity of the hard clam E. exalbida from Ushuaia Bay, Beagle Channel were investigated. The parameters of the von Bertalanffy growth function were estimated to be H = 73.98 mm, K = 0.180 y 1, t0 = 0.147 y. Maximum individual production amounted to 2.742 g shell free wet mass (SFWM) at 49.5 mm shell height. Animals between 40 mm and 70 mm shell height contribute most to overall population somatic production P of 133.89 g SFWM m-2 y-1. Mean annual biomass B amounted to 1122.69 g SFWM m-2 y-1. Annual P/B ratio and mortality rate Z were estimated to 0.119 y-1 and 0.141 y-1, respectively. Slow growth and low turnover makes this population less suitable for sustainable commercial exploitation.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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  • 8
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    Population dynamics of the venerid bivalve, Tawera gayi (Hupé, 1854) in the Ushuaia Bay, Beagle Channel (2005)
    In:  EPIC3Journal of applied ichthyology, 21(1), pp. 64-69, ISSN: 0175-8659
    Details
    Publication Date: 2019-07-16
    Description: Growth, productivity and potential for exploitation of the clam Tawera gayi from shallow waters (3 to 5 m) of Ushuaia Bay, Beagle Channel were investigated. Mean abundance and biomass in the study area were 1091 ± 737 ind m^-2 and 901.83 g SFWM m^-2 (shell free wet mass) respectively. Individual growth was described best by the von Bertalanffy growth model with the parameter values H? = 28.03 mm, K = 0.288 y^1, t0 = -0.34 (r^2 = 0.83). Annual production of the population was estimated to be 120.45 g SFWM m^-2 y^-1, corresponding to a P/B ratio of 0.134 y^-1. The single negative exponential mortality model does not fit the population mortality pattern, but predation by gastropods (Xymenopsis muriciformis, Trophon geversianus, Natica sp.) appears to be the major cause of mortality. These highly mobile predators together with the comparatively slow growth and low turnover of T. gayi in Ushuaia Bay limit its potential for sustainable commercial exploitation.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
    Format: application/pdf
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  • 9
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    Fertilidad y periodicidad del desove en Ostrea puelchana (2007)
    Mar del Plata: Instituto Nacional de Investigación y Desarrollo Pesquero (INIDEP)
    Details
    Publication Date: 2021-05-19
    Description: Larvae production by Ostrea puelchana was studied in colections obtained from November to March 1977-78 and 1978-79. During the first period there seems to be a direct relation between the highest percentage of gravid female and the moon crescent quarter. This relation is not repeated in the following year. Compared with other larviparous oysters, O.puelchana produces a greather number of embryons of smaller size, with shorter breeding period and longer planktonic life.
    Description: Publisher permission
    Description: Published
    Description: Anysomiaria, Ostreidae, Ostrea puelchana, fecundidad, desove, fases lunares
    Keywords: Spawning ; Fecundity ; Moon phases ; Spawning ; Fecundity ; Moon phases
    Repository Name: AquaDocs
    Type: Journal Contribution
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  • 10
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    Estrategias reproductivas de moluscos bivalvos y equinoideos (2008)
    Mar del Plata: Instituto Nacional de Investigacion y Desarrollo Pesquero
    Details
    Publication Date: 2021-05-19
    Description: The theoretical aspects of reproductive strategies and life histories are analyzed. The gonadal structures and the main features of gametogenesis of bivalves and echinoids are described. Research on the reproductive characteristics and gametogenic cycles of the bivalve molluscs in the Argentinian littoral and the echinoid Loxechinus albus is reviewed. Special references to Mytilus edulis, Aulacomya ater, Brachidontes purpuratus, Aequipecten tehuelchus, Zygochlamys patagonica, Ostrea puelchana, Clausinella gayi, Protothaca antiqua, Eurhomalea exalbida and Mesodesma mactroides are made. Analysis of reproductive cycles includes histological and ponderal descriptions of gonadal variations. The main trend found is the partial and multiple spawning episodes. Sexual variations in dioecious and hermaphroditic species are discussed.
    Description: Calvo, J.; Morriconi, E.; Orler, P.; 1998. Estrategias reproductivas de moluscos bivalvos y equinoideos. En: Boschi, E.E.; ed. Los moluscos de interés pesquero. Cultivos y estrategias reproductivas de bivalvos y equinoideos. Mar del Plata: Instituto Nacional de Investigación y Desarrollo Pesquero INIDEP, (El Mar Argentino y sus Recursos Pesqueros; 2 ) p.195-231.
    Description: Published
    Description: Aulacomya ater, Brachidontes purpuratus, Clausinella gayi, Loxechinus albus, Mesodesma mactroides, Mytilus edulis, Ostrea puelchana, Pandalus montagui, Zygochlamys patagonica, ciclo de vida, reproducción, moluscos marinos
    Keywords: Hermaphroditism ; Gametogenesis ; Life cycle ; Reproduction ; Hermaphroditism ; Gametogenesis ; Life cycle ; Marine molluscs ; Reproduction ; Reproductive cycle
    Repository Name: AquaDocs
    Type: Book Section
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