Morphological Malformations in Bivalves with Economic Interest from the Tunisian Coast
Morphological malformations affecting the shell and/or the soft part in three commercial bivalve species collected from Tunisian coast are described. In Ruditapes decussatus, the soft part showed two additional siphons emerging up from the two normal siphons. Shell disturbance in this bivalve showed a lesion with a brown deposit on the posterior side of the inner face which can lead to shell perforation. In Lithophaga lithophaga, only shell disturbances were detected. Burrowing annelids and sipunculids living inside galleries on the valve internal surface were removed. In the external surface of the valves, brownblackish or white stains were found. Shell ESEM (Environmental scanning electron microscopy) examination showed the presence of intense mucilage on the external valve surfaces collocated with the mi croscopic tubiculous annelids. On the internal side, the shell was perfored by minute pores. In Mytilus galloprovincialis a yellowish mass located in the anterior surface of the shell was revealed. This mass was firmly fixed to the pearly shell layer by a hard brownish structure. The mass covered some elliptic eggs with a size varying between 180 and 200 μm. Some specimens, collected in April, showed the presence of embryos at various developmental stages fixed on the internal shell layer.
Ruditapes decussatus Lithophaga lithophaga Mytilus galloprovincialis malformations lesions brown deposit
Ferdaous J.KEFI Lamia G.BEN ABDALLAH Najoua T.EL-MENIF
University of 7th November at Carthage,Faculty of Sciences of Bizerte,Department of Biology,Laborato University El Manar II,Faculty of Sciences of Tunisia,Department of Biology,Laboratory of parasitolo
国际会议
2009 International Symposium on Environmental Science and Technology(2009环境科学与技术国际会议)
上海
英文
60-66
2009-06-02（万方平台首次上网日期，不代表论文的发表时间）