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dc.contributor.advisorGonzález, Juan G.
dc.contributor.authorCepeda Pérez, Evelyn
dc.date.accessioned2018-12-15T12:03:03Z
dc.date.available2018-12-15T12:03:03Z
dc.date.issued2004-07
dc.identifier.urihttps://hdl.handle.net/20.500.11801/1661
dc.description.abstractThe northern quahog, Mercenaria mercenaria was accidentally introduced to Puerto Rico in the early decades of the 20th century. Since then, a small-scale market has been established along the northeast coast of the island. The presence of hard clams or northern quahogs in localized areas in Puerto Rico and the possible revenues for the island economy present Mercenaria sp. as a suitable organism to be considered for local mariculture activities. Two attempts have been made to evaluate Mercenaria sp. as a possible candidate for mariculture. However, neither of them studied the reproductive response under controlled conditions in tropical waters. This experiment evaluated the response of two populations (Florida stock and Puerto Rico stock) of M. mercenaria to induced spawning by thermal stimuli. It also evaluated possible disease outbreaks during Mercenaria mercenaria rearing; growth and survival rates, and larval development. The results were compared with clam hatchery production in the southeastern region of United States. Relationships between clam responses of both populations to thermal stimuli, clam size and conditioning time were analyzed with a binomial non-parametric Kruskal-Wallis test. Although, the Florida stock displayed better performance, poor responses from both populations were obtained. Results revealed a negative effect of time spent by clams in the conditioning tank and their response to the induced spawning method (P< 0.001). Clam growth and survival rates were comparable with those reported for commercial hatcheries of the southeastern region of the United States. Presences of bacterial and ciliate infections were reduced with the implementation of better sanitary procedures.en_US
dc.description.abstractLa almeja, Mercenaria mercenaria fue introducida accidentalmente en Puerto Rico para las primeras décadas del siglo veinte. Desde entonces, ha existido un mercado a pequeña escala para la venta de este producto en la costa noreste de Puerto Rico. Se considera una especie con potencial de cultivo local ya que hay poblaciones establecidas y por los posibles ingresos económicos que puede aportar a la economÍa isleña. En dos investigaciones previas se ha evaluado la producción de esta almeja. Sin embargo, ninguno de éstos ha estudiado su comportamiento reproductivo bajo condiciones controladas en agues tropicales. Este experimento evalua el comportamiento reproductivo de dos poblaciones de M. mercenaria (Florida y Puerto Rico) a estímulos térmicos utilizados para inducción de desove. Se analizó también el posible desarrollo de enfermedades durante el cultivo de las diferentes etapas larvales, la tasa de crecimiento, sobrevivencia y el desarrollo larval de la M. mercenaria. Los resultados se compararon con los datos de producción de viveros comerciales en la region sureste de Estados Unidos. La relación entre el comportamiento al método de desove de ambas poblaciones al estÍmulo térmico, tamaño de la almeja y el tiempo de acondicionamiento fue analizado utilizando una prueba no paramétrica binomial de Kruskal-Wallis. Aunque la población de Florida mostró una mejor respuesta al estÍmulo termal, ambas tuvieron un comportamiento pobre ante la inducción del desove. Los resultados indican que existe un efecto negativo en las almejas y éste afecta el comportamiento de ellas ante el estímulo térmico (P< 0.001). La tasa de crecimiento y la sobrevivencia de las almejas compara favorablemente con los datos de producción que se obtienen de los viveros comerciales en la región sureste de los Estados Unidos. La presencia de ciliados y bacterias en algunos de los tanques de cultivo se redujo con la implantación de un programa agresivo de higienización.en_US
dc.description.sponsorshipUniversity of South Florida; Harbor Branch Oceanographic Institution, Inc.; Cataño Fisheries Association; Sea Grant College Program; Commercial Aquaculture Research and Development Center for Puerto Rico; Fisheries Research Laboratory of the Department of Natural and Environmental Resources; Alliance for Graduate Education and the Professoriate (AGEP) grant number HDR-9817642en_US
dc.language.isoenen_US
dc.subjectMercenaria mercenaria (Linné, 1758) - Induced spawning –- Puerto Ricoen_US
dc.subjectMercenaria mercenaria (Linné, 1758) - Effect of temperature on – Puerto Ricoen_US
dc.subjectClam mariculture – Effect of disease outbreaks on - Puerto Ricoen_US
dc.subjectClams – Breeding – Puerto Ricoen_US
dc.subject.lcshNorthern quahog--Puerto Rico.en_US
dc.titleInduced spawning behavior and larval development of the hard clam, Mercenaria mercenaria (linné, 1758) in Puerto Ricoen_US
dc.typeDissertationen_US
dc.rights.licenseAll rights reserveden_US
dc.rights.holder(c) 2004 Evelyn Cepeda Pérezen_US
dc.contributor.committeeLilyestrom, Craig
dc.contributor.committeeWilliams, Ernest H.
dc.contributor.committeeBunkley-Williams, Lucy
dc.contributor.committeeKubaryk, John M.
dc.contributor.committeeAponte, Nilda E.
dc.contributor.representativeWiscovich Teruel, Saúl
thesis.degree.levelPh.D.en_US
thesis.degree.disciplineMarine Sciencesen_US
dc.contributor.collegeCollege of Arts and Sciences - Sciencesen_US
dc.contributor.departmentDepartment of Marine Sciencesen_US
dc.description.graduationSemesterSpringen_US
dc.description.graduationYear2004en_US


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