Ke, Caihuan

Luo, Xuan

You, Weiwei

柯才焕

游伟伟

Journal of Shellfish Research

English

Xiamen University Institutional Repository

LUMPY BUMPY THE SEA STAR: REVISITING AN INTER-NAL MOLLUSCAN PARASITE OF SEA STARS.Vanessa Lowe.NOAA, 7600 Sand Point Way NE, Seattle, WA, 98115, USA.During annual NOAA Fisheries stock assessment surveys, theFisheries Resources Pathobiology team monitors diseases of fishand shellfish in the Bering Sea, Alaska. As a routine practice, werecord rare cases and new anomalies. In summer 2010, a grosslymisshapen sea star of the species Leptasterias polaris was encoun-tered with large swollen regions and will be presented as a casestudy. The sea star arms were parasitized by multiple individualsof a gastropod in the family Eulimidae, known to be the onlygastropod group parasitizing echinoderms. The body plan of theendoparasite, likely a species ofAsterophila, is modified frommostgastropods. Within the arm of the sea star, females deposit andbrood an eggmass, leading to the physical distortions of the host aseggs develop into veliger larvae. Parasitism of sea stars byAsterophila japonica in the Chukchi Sea, Alaska was examined in1980, but currently the range of this parasite in the Bering Sea isunknown. We will present molecular and morphological data onthis case.HETEROSIS ANALYSIS ON INTERSPCIFIC HYBRIDS BE-TWEEN HALIOTIS DISCUS HANNAI AND H. GIGANTEA.Xuan Luo, Caihuan Ke, Weiwei You.Xiamen University, Zengchengkui Building, XiamenUniversity,Xiamen, Fujian, 361005, China.Haliotis discus hannai is the most important species of gastro-pods in aquaculture for China, however many abalone farms havebeen particularly affected by germplasm degradation of H. discushannai.H. gigantea, which possesses excellent disease resistance, isa valued commercial species along the coast of Japan. This specieswas introduced from Japan to China for mariculture in 2003. A2 3 2 complete diallele cross was conducted between H. discushannai (D) and H. gigantea (G) to produce hybrid abalones.Growth performance and survival of the reciprocal hybrids ofH. discus hannai andH. giganteawere investigated. Results showedthat the fertilization and hatching rate of the reciprocal hybridswere significantly lower than those of the parental species (P <0.05). At grow-out stage, both reciprocal hybrids grew at similarrates (P > 0.05), but significantly faster than thir parents (P < 0.05).Moreover, survival was similar in reciprocal hybrids and one ofconspecific group H. gigantea, while a significantly higher mortal-ity occurred in the other conspecific group H. discus hannai (P <0.05). The superiority of growth and survival of the reciprocalhybrids over their parental controls indicates hybrid vigor and hassignificant implications for the improvement of abalone aquacul-ture in China.DIFFERING SUSCEPTIBILITY TO COMMENSALS ANDPOTENTIAL PATHOGENS COULD GIVE MYTILUS GAL-LOPROVINCIALIS AN ADVANTAGE OVER MYTILUSEDULIS.Sharon Lynch, E. Morgan, O. Hegarty, M. Galvin, S.C. Culloty.University College Cork, The Cooperage, Distillery Fields, NorthMall, Cork, Ireland.In Ireland, both wild and cultured Mytilus spp. are widelydistributed on all coasts. Mytilus edulis, Mytilus galloprovinicialisand hybrids of both species are found on the west and southcoast of Ireland while M. edulis is found on the east coast. InWales, it is believed that only M. edulis is present. This studyinvestigated the health status of these mussels. Samples of wildand cultured Mytilus spp. were collected from twenty-four sitesencompassing all coasts of Ireland and the Welsh Coast, atdifferent times of the year over several years. In total, eighthundred and forty-one Mytilus spp. were examined. Habitatdescription and the environmental factors influencing the studysites were recorded. AllMytilus spp. samples were screened usinghistology to determine health status and the presence of anypotential pathogens/parasites. At certain study sites a cPCRwas carried out to differentiate which mytilid species werebeing screened. Copepods, ciliates, trematode spp. prokaryoteinclusion bodies and Nematopsis spp. were detected in themussels. The prevalence of infection and/ pathological changesvaried among the sites and were observed in both mytilid speciesand hybrids.AN UPDATE ON SURVEY FINDINGS AND RESEARCHEFFORTS ON OLYMPIA OYSTERS (OSTREA LURIDA) INCANADA.Sean E. M. MacConnachie.Pacific Biological Station, 3190 Hammond Bay Road, Nanaimo,British Columbia, V9T6N7, Canada.Olympia oysters, Ostrea lurida Carpenter, 1864, were first as-sessed by the Committee on the Status of Endangered Wildlife inCanada (COSEWIC) in 2000 and were listed under the Species AtRisk Act in 2003 as a species of Special Concern. Fisheries andOceans Canada posted a five-year management plan in response tothe listing. The goal of the plan is to maintain stable populationsof Olympia oysters in BC. The indicator used to measure successin attaining that goal is to measure the relative abundance ofOlympia oysters at index sites over the six year period 2008–2013.Thirteen index sites were identified, based on a combination ofpre-determined criteria (previous data, accessibility, collaborativeinterest and representative of potential threats) and randomselection. All 13 sites have had baseline surveys completed. Surveyshave also been conducted to verify historical records; beaches withhistorical records were targeted and adjacent sites were addedopportunistically. A total of 196 beaches were surveyed between316 Abstracts 104th Annual Meeting, March 24–29, 2012 National Shellfisheries Association, Seattle, Washington

HETEROSIS ANALYSIS ON INTERSPCIFIC HYBRIDS BETWEEN HALIOTIS DISCUS HANNAI AND H. GIGANTEA

https://dspace.xmu.edu.cn/bitstream/2288/15618/1/HETEROSIS%20ANALYSIS%20ON%20INTERSPCIFIC%20HYBRIDS%20BETWEEN%20HALIOTIS%20DISCUS%20HANNAI%20AND%20H.%20GIGANTEA.pdf

HETEROSIS ANALYSIS ON INTERSPCIFIC HYBRIDS BETWEEN HALIOTIS DISCUS HANNAI AND H. GIGANTEA

Abstract

Similar works

Full text

Available Versions

Xiamen University Institutional Repository