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  • 1
    Electronic Resource
    Electronic Resource
    Growth and survival of the scallop Lyropecten (=Nodipecten) nodosus (L. 1758) in suspended culture in the Cariaco Gulf (Venezuela) during a non-upwelling period (2003)
    Oxford, UK : Blackwell Science Ltd
    Aquaculture research 34 (2003), S. 0 
    Details
    ISSN: 1365-2109
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Growth and survival of the scallop Lyropecten nodosus were studied in 1997 at two sites (inner and outer Turpialito Bay) during a non-upwelling period normally occurring between August and November. Individuals had an initial shell height of 4.86 cm (SD=1.64 cm). Both experimental groups were held in suspended plastic baskets at the same depth (4 m). Measurements of shell height and dry weights of shell, gonad, digestive gland, remaining tissues and shell biofouling were taken at monthly intervals. Environmental parameters, including temperature, phytoplanktonic biomass, total particulate material (TPM) and associated organic (POM) and inorganic (PIM) fractions, were recorded simultaneously. At the end of the study, significant differences in growth and survival of scallops were observed between the two experimental sites. Scallops maintained inside the bay showed a 22% greater increase in shell height (7.41±0.27 cm) than those placed outside the bay (6.37±0.41 cm). Survival of scallops inside the bay was 31% higher compared with scallops outside. The greater availability of food of phytoplanktonic origin during the first two experimental months (July and August) together with greater POM throughout the whole experimental period except September, at the inner bay site, probably explained survival and growth differences observed between the two locations. Results suggest that, during the non-upwelling period (characterized by low primary productivity and high water temperatures), POM of sedimentary origin may play an important role as an energy source required for metabolic and reproductive activities of L. nodosus.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2109.2003.00872.x
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  • 2
    Electronic Resource
    Electronic Resource
    Influence of fouling on the growth and survival of the tropical scallop, Euvola (Pecten) ziczac (L. 1758) in suspended culture (1996)
    Oxford, UK : Blackwell Publishing Ltd
    Aquaculture research 27 (1996), S. 0 
    Details
    ISSN: 1365-2109
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: To examine the impact of fouling organisms on the growth and survival of the scallop Euvola ziczac L., we maintained 31-34-mm juveniles in pearl nets at 8 m in depth at Turpialito, Golfo de Cariaco, Venezuela. The experiment ran for a 67-d period under four conditions: (1) shells and nets cleaned; (2) shells not cleaned and nets cleaned; (3) shells cleaned and nets not cleaned; and (4) shells and nets not cleaned. The growth of the scallop was least when fouling developed on both the pearl nets and scallop shells. The rate of growth of the shell (height and mass) was strongly affected by organisms colonizing the pearl nets and only weakly affected by organisms colonizing the shells. Fouling organisms on the shells only slightly affected rates of increase of tissue mass, but probably accounted for increased mortality. In developing commercial culture of E. ziczac, strategies need to be developed to limit the adverse effects of fouling on yield.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2109.1996.t01-1-00790.x
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  • 3
    Electronic Resource
    Electronic Resource
    Nutritional quality of Metamysidopsis insularis Brattegard (Crustacea: Mysidacea) (2005)
    Oxford, UK : Blackwell Science Ltd
    Aquaculture nutrition 11 (2005), S. 0 
    Details
    ISSN: 1365-2095
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: In natural conditions the mysid Metamysidopsis insularis is commonly found in the littoral lagoon of Margarita Island (Venezuela). It is used as live food in the marine fish culture. However, its nutritional quality is not well documented. In the present study we analysed the nutritional value (total protein, carbohydrate and lipids profile) of M. insularis. The mysids were collected in La Restinga lagoon (Margarita Island, Venezuela). Levels of total proteins, lipids and carbohydrates were 700 ± 28.5, 160 ± 13.9 and 20 ± 0.90 g kg−1 respectively. The lipids classes were 427 ± 2, 106 ± 98, 287 ± 113 and 179 ± 87 for phospholipids, triglycerides, cholesterol and cholesterol esters respectively. The fatty acids profile, determined by gas chromatography, showed important concentration of fatty acids for the metabolism of marine organism, such as 16:0, 18:0, 18:2n-6, 18:3n-3, 18:4-3, 20:5n-3 and 22:6n-3; attaining levels of 27.49% in PUFA n-3 and 2.92% in n-6. The relation of eicosapentaenoic acid/docosahexaenoic acid was 2.1 ± 0.15. The results support the use of M. insularis as food for species of fish and crustaceans under culture conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2095.2005.00361.x
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  • 4
    Electronic Resource
    Electronic Resource
    Bacillary necrosis in hatcheries of Ostrea edulis in Spain
    Amsterdam : Elsevier
    Aquaculture 65 (1987), S. 15-29 
    Details
    ISSN: 0044-8486
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0044-8486(87)90267-5
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Relation of RNA/DNA ratios to growth for the scallop Euvola (Pecten) ziczac in suspended culture (1996)
    Springer
    Marine biology 126 (1996), S. 245-251 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract We examined the relation of RNA/DNA ratios to growth for three size groups of the tropical scallop Euvola ziczac maintained in suspended culture at 8, 21 and 34 m in depth in the Golfo de Cariaco, Venezuel. Various growth parameters indicated that production decreased with depth. This was more likely due to a decrease in seston quality with depth than to temperatures or seston abundance (which were similar at the various depths studied). The RNA/DNA ratio was correlated with the G-index of muscle growth for juveniles (r 2=0.55). A much weaker correlation was observed for the maturing scallops (r 2=0.18), probably because of the interaction between reproductive and somatic growth. In fully mature scallops, somatic growth was negligible and the RNA/DNA ratios appeared to be inversely related to the level of physiological stress of the scallops. Whereas RNA/DNA ratios are difficult to interpret for maturing E. ziczac, because an increased ratio can be due to either increased gonadal or somatic growth, they are useful in predicting growth in juveniles and physiological stress in fully mature scallops.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00347449
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  • 6
    Electronic Resource
    Electronic Resource
    Seasonal variation in the properties of muscle mitochondria from the tropical scallop Euvola (Pecten) ziczac (1997)
    Springer
    Marine biology 128 (1997), S. 247-255 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract In scallops, gametogenesis leads to considerable transfer of energetic reserves from the adductor muscle to the gonads. During an annual cycle, the scallops are exposed to changes in temperature and food availability. As these changes may affect muscle metabolic capacities, we examined whether the properties of the mitochondria in the phasic adductor muscle were modified during the annual cycle of the scallop Euvola (Pecten) ziczac (L. 1758). During our study, temperature and chlorophyll a levels generally showed an inverse relationship: high temperatures and low chlorophyll a levels occurred from mid-April to early June. Lower temperatures and higher chlorophyll a levels were found from January to late March and from mid-June to mid-September. Throughout the annual cycle, the substrate preferences and the pH sensitivity of the isolated muscle mitochondria changed little, whereas the maximal oxidative capacities and respiratory control ratios (RCR) varied considerably. Consistently, the maximal capacities for substrate oxidation were 30 to 80% lower in mitochondria isolated in May than at other times in the year. The RCR values of mitochondrial oxidation of glutamate, glutamine and succinate varied throughout the year with lower values characterizing the mitochondria from scallops harvested in May and in certain cases in August. In May, adductor muscles had lower protein levels than at other times. These data suggest that the requirements of gametogenesis, coupled with␣the high temperatures and low food availability occurring during April and May, led to a mobilization of muscle proteins which concomitantly decreased the oxidative capacity of isolated mitochondria.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002270050089
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  • 7
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    Growth and survival of the winged oyster Pteria colymbus in suspended culture: influence of environmental factors associated to upwelling periods (2017)
    Springer
    In:  Aquaculture International, 25 (4). pp. 1653-1666.
    Details
    Publication Date: 2020-02-06
    Description: The present study examines the influence that environmental variables exerted on changes in condition index (CI), shell height (SH—dorsal-ventral axis) and soft tissue mass increments (STM) of the winged oyster Pteria colymbus in suspended culture during periods of upwelling (December to April) and non-upwelling (August to November) in the Cariaco Gulf, northeastern Venezuela. Environmental variables recorded between April 2012 and May 2013 included seston, water transparency, temperature, dissolved oxygen, chlorophyll a (Chl a) and the upwelling index (UI). Individuals were cultivated in lantern nets with an overall density of 56 individuals/0.123 m2. From three randomly chosen baskets, five individuals were sampled each month and changes in CI, STM and SH were related to the environmental variables using Spearman correlation and PCA. Results show that during upwelling, both Chl a and UI presented a positive and significant relationship with the oyster condition and growth parameters. During non-upwelling (low UI), this relationship was inverse, demonstrating the important influence of upwelling and non-upwelling periods on the ecophysiology of the species. Furthermore, it was shown that the non-upwelling, characterized by high temperatures and low food availability, is a critical period for P. colymbus, judging by a decrease in growth and survival rate. Nonetheless, this species reached 50 mm in 5 months, a size considered as commercially viable, suggesting that the study area is favourable to the cultivation of the winged oyster despite a dramatic decrease in upwelling intensity in the last decade.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1007/s10499-017-0141-2
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 8
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    Annual recruitment, predation rates and biocontrol of Linatella caudata (Mollusca: Gastropoda) in suspended enclosure culture of the pearl oyster Pinctada imbricata (2012)
    Elsevier
    In:  Aquaculture, 354/355 . pp. 75-83.
    Details
    Publication Date: 2016-05-25
    Description: We present data on recruitment of the marine gastropod Linatella caudata (Gmeling, 1791) and their predation rates on the pearl oyster Pinctada imbricata in suspended culture using Spanish baskets. The recruitment rate of juveniles of L. caudata was studied every 30 days over a year. The bivalve culture enclosures were suspended in the water column at two sites in the Gulf of Cariaco (northeastern Venezuela) characterized by different oceanographic and environmental conditions; Turpialito and an internal area of Laguna Grande del Obispo (LGO). Environmental variables including temperature, chlorophyll a, total (organic and inorganic) seston and wind intensity were recorded. The sea urchin Echinometra lucunter was placed on culture baskets as a predator (biocontrol). Plastic mesh cultivation bags were also tested as an alternative method to prevent or decrease the recruitment of these predators at Turpialito. The results showed a significantly higher number of predators at Turpialito than in the sheltered LGO site in May, June and July only. During the period of intense predator recruitment, principal component analysis (PCA) revealed that chlorophyll a, organic seston and wind strength were directly related to predator recruitment. During the period of less intense predator recruitment when wind intensity was lower, PCA showed that the same variables were directly related to predator recruitment whereas temperature showed an inverse relationship. In contrast, no relationship between recruitment of predators and environmental variables could be established for the LGO site. However, predator recruitment at LGO was significantly lower in the plastic mesh bags than in Spanish baskets, and in the presence of the sea urchin Echinometra lucunter. Due to high rates of predation observed, L. caudata constitutes a serious problem for the aquaculture industry of marine bivalves.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1016/j.aquaculture.2012.03.037
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 9
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    Reproductive tactics of marine shellfish species from north-eastern Venezuela: ecophysiological implications (2014)
    Novinka
    In:  In: Spawning: Biology, Sexual Strategies and Ecological Effects. , ed. by Baqueiro Cardenas, E. R. Novinka, New York, pp. 73-106. ISBN 978-1-63117-655-5
    Details
    Publication Date: 2017-03-22
    Type: Book chapter , NonPeerReviewed
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    OceanRep: Book chapter
  • 10
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    Producción de biomasa de la microalga marina Chroomonas sp., en función del pH, intensidad luminosa y salinidad (2009)
    INVEMAR - Santa Marta, Colombia
    Details
    Publication Date: 2021-05-19
    Description: Se reporta la caracterización de la microalga marina Chroomonas, aislada de una laguna salina ubicada al Norte de Maracaibo, Estado Zulia, Venezuela. El crecimiento y producción de pigmentos en cultivos discontinuos, se evaluó en función de la salinidad (5, 10, 35, 50, 70 y 100 ppm), intensidad luminosa (39, 78, 117 y 156 µmol quanta.m-2.s-1) y pH (5.0, 5.5, 6.0, 7.0, 8.0 y 9.0). La mayor densidad celular de 117.99±2.62x106 cel.ml-1, se alcanzó a 35 ppm, 156 µmol quanta.m-2.s-1 de intensidad luminosa y a un pH entre 6.0 y 8.0. El contenido celular de clorofila total y carotenoides se incrementa con la salinidad hasta 100 ppm, con 246.55±61.8 y 69.79±18.19 fg.cel-1 respectivamente. Chroomonas sp. demostró alta capacidad de producción de biomasa y de pigmentos cuando se cultivó a un volumen de 2.0 l en régimen semicontinuo y a una tasa de renovación diaria del 30 %. La productividad celular fue de 4.31x109 cel.l-1d-1; mientras que la de clorofila total y carotenoides de 1.4 mg.l-1.d-1 y 0.48 mg.l-1.d-1, respectivamente. Estos resultados indican que esta microalga planctónica podría ser utilizada diariamente como alimento vivo en acuicultura y para la producción de biomasa microalgal y/o pigmentos.
    Description: We report the characterization of a marine microalga of the genus Chroomonas, isolated from a salt lagoon located to the north of Maracaibo, Zulia State, Venezuela. We evaluated the growth and the pigment production in discontinuous culture at different salinites (5, 10, 35, 50, 70 Y 100 ppm),Iight intensites (39,78,117 and 156 µmol quanta.m-2.s-1) and pH (5.0,5.5,6.0,7.0, 8.0 and 9.0). The highest cellular density, 117.99±2.62x106 cel.ml-1, was reached at 35ppm, 156 µmol quanta.m-2.s-1 of light intensity and a pH between 6.0 and 8.0. The cellular content of total chlorophyll and carotenoids increased with the salinity up to 100 ppm, with amounts of 246.55±61.8 and 69.79±18.19 fg.cel-1 respectively. The cellular productivity 4.31x109 cel.l-1d-1 was obteined when the microalga, was grown in semi-continuous culture, at a 2.0 I volume and at a daily renewal rate of 30 % (v/v). The total amount of chlorophyll and carotenoids 1.4 mg.l-1.d-1 and 0.48 mg.l-1.d-1 respectively. This results indicate that this planktonic microalga could be used as daily live food for larvae in aquaculture and for the production of microalgaI biomass and/or pigments.
    Description: Published
    Description: Parapontocaris; Parapontophilus; Prionocrangon
    Keywords: Continental slope
    Repository Name: AquaDocs
    Type: Journal Contribution
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