The study investigated the effects of environmental factors (salinity, pH, ions and activation media) on sperm motility (activation rate, duration of quick movement, and lifespan) and fertilization rate of Phascolosoma esculenta. The results showed that spermatozoa in the coelom and nephridium are able to move quickly. The optimal salinity was 14.64 to 43.35 and the optimal pH was 6.46 to 9.53 for sperm activation and motility, whereas the ranges for fertilization were narrower (18.56 to 30.3 for salinity and 6.46 to 8.61 for pH). Of the ions studied, Na+ was indispensable for sperm motility and fertilization, and Ca2+ and Mg2+ were necessary for fertilization. P. esculenta sperm could not fertilize eggs and have short lifespans in 200 to 600 mmol/L NaCl and KCl solutions. Furthermore, they could not be activated or move in 200 to 600 mmol/L CaCl2, MgSO4, and sucrose solutions.
Alavi, S. M. H., Rodina, M., Policar, T., Linhart, O. (2009) Relationship between semen characteristics and body size in Barbus barbus L. (Teleostei: Cyprinidae) and effects of ions and osmolality on sperm motility. Comp. Biochem. Physiol. A 153, 430–437.
Linhart O. , 'Relationship between semen characteristics and body size in Barbus barbus L. (Teleostei: Cyprinidae) and effects of ions and osmolality on sperm motility ' (2009 ) 153 Comp. Biochem. Physiol. A : 430 -437.
Alavi, S. M. H., Cosson, J. (2006) Sperm motility in fishes. (II) Effects of ions and osmolality: A review. Cell Biol. Int. 30, 1–14.
Cosson J. , 'Sperm motility in fishes. (II) Effects of ions and osmolality: A review ' (2006 ) 30 Cell Biol. Int. : 1 -14.
Boni, R., Gualtieri, R., Talevi, R., Tosti, E. (2007) Calcium and other ion dynamics during gamete maturation and fertilization. Theriogenology 68, 156–164.
Tosti E. , 'Calcium and other ion dynamics during gamete maturation and fertilization ' (2007 ) 68 Theriogenology : 156 -164.
Cai, Y. C., Lin, H. Z., Wu, K. C., Li, Y. N., Su, T. F., Jiang, S. G. (2001) Activation conditions of spermatozoa from dissected parent Pinctada margaritifera. J. Fish Sci. China 8, 9–12.
Jiang S. G. , 'Activation conditions of spermatozoa from dissected parent Pinctada margaritifera ' (2001 ) 8 J. Fish Sci. China : 9 -12.
Deng, Y. S., Lin, H. R. (1999) Advance in fish sperm motility. Life Sci. Res. 4, 271–278.
Lin H. R. , 'Advance in fish sperm motility ' (1999 ) 4 Life Sci. Res. : 271 -278.
Gu, X. Y., Zhu, J. Q., Xu, S. J., You, Z. J., Wang, W. (2009) Oogenesis of Phascolosoma esculenta: histological study. Oceanol. et Limnol. Sin. 40, 283–288.
Wang W. , 'Oogenesis of Phascolosoma esculenta: histological study ' (2009 ) 40 Oceanol. et Limnol. Sin. : 283 -288.
He, Q., Zhao, E., Lu, Y. L., Yan, M. C., Huang, C. J., Dong, Q. X. (2012) Evaluation of activation and storage conditions for sperm of yellow drum Nibea albiflora. Aquaculture 324–325, 319–322.
Dong Q. X. , 'Evaluation of activation and storage conditions for sperm of yellow drum Nibea albiflora ' (2012 ) 324–325 Aquaculture : 319 -322.
Hu, J. H., Zhang, S. C., Zhang, Y. Z., Xu, Y. Y. (2006) Motility characteristics of the sperm of the amphioxus Branchiostoma belcheri tsingtauensis as revealed by computer-assisted sperm analysis. Acta Zool. Sin. 52, 706–711.
Xu Y. Y. , 'Motility characteristics of the sperm of the amphioxus Branchiostoma belcheri tsingtauensis as revealed by computer-assisted sperm analysis ' (2006 ) 52 Acta Zool. Sin. : 706 -711.
Hu, J. H. (2005) Motility of spermatozoa in amphioxus and rosy barb and their application of the acute toxicity assay in vitro. Dissertation, Ocean Univ. China, Shandong, pp. 1–66.
Hu J. H. , '', in Dissertation, Ocean Univ. China, Shandong, pp. , (2005 ) -.
Jin, C. H., Zhu, J. Q., Xu, S. J., Wang, W. (2011) Study on the embryonic and larval development of Phascolosoma esculenta. Oceanol. et Limnol. Sin. 52, 94–100.
Wang W. , 'Study on the embryonic and larval development of Phascolosoma esculenta ' (2011 ) 52 Oceanol. et Limnol. Sin. : 94 -100.
Jing, R., Huang, C. J., Bai, C. L., Tanguay, R., Dong, Q. X. (2009) Optimization of activation, collection, dilution, and storage methods for zebrafish sperm. Aquaculture 290, 165–171.
Dong Q. X. , 'Optimization of activation, collection, dilution, and storage methods for zebrafish sperm ' (2009 ) 290 Aquaculture : 165 -171.
Li, X., Liu, S. F., Kang, L., Xu, D. X. (2002) The influence of environmental factors on sperm motion and fertilization of the abalone and oyster. J. Dalian Fish. Univ. 17, 25–30.
Xu D. X. , 'The influence of environmental factors on sperm motion and fertilization of the abalone and oyster ' (2002 ) 17 J. Dalian Fish. Univ. : 25 -30.
Morisawa, M., Morisawa, S., Santis, R. D. (1984) Initiation of sperm motility in Ciona intestinalis by calcium and cyclic AMP. Zool. Sci. 1, 237–244.
Santis R. D. , 'Initiation of sperm motility in Ciona intestinalis by calcium and cyclic AMP ' (1984 ) 1 Zool. Sci. : 237 -244.
Orfão, L. H., Nascimento, A. F., Corrêa, F. M., Cosson, J., Viveiros, A. T. M. (2011) Extender composition, osmolality and cryoprotectant effects on the motility of sperm in the Brazilian endangered species Brycon opalinus (Characiformes). Aquaculture 311, 241–247.
Viveiros A. T. M. , 'Extender composition, osmolality and cryoprotectant effects on the motility of sperm in the Brazilian endangered species Brycon opalinus (Characiformes) ' (2011 ) 311 Aquaculture : 241 -247.
Rice, M. E. (1966) Reproductive biology and development in sipuncula. Doctoral Dissertation, Univ. Wash., Seattle, pp. 46–66.
Rice M. E. , '', in Doctoral Dissertation, Univ. Wash., Seattle, pp. , (1966 ) -.
Wang, H., Zhu, X. W., Wang, Y. N., Luo, M. M., Liu, Z. G. (2012) Determination of optimum temperature and salinity for fertilization and hatching in the Chinese pearl oyster Pinctada martensii (Dunker). Aquaculture 358–359, 292–297.
Liu Z. G. , 'Determination of optimum temperature and salinity for fertilization and hatching in the Chinese pearl oyster Pinctada martensii (Dunker) ' (2012 ) 358–359 Aquaculture : 292 -297.
Wilson-Leedy, J. G., Kanuga, M. K., Ingermann, R. L. (2009) Influence of osmolality and ions on the activation and characteristics of zebrafish sperm motility. Theriogenology 71, 1054–1062.
Ingermann R. L. , 'Influence of osmolality and ions on the activation and characteristics of zebrafish sperm motility ' (2009 ) 71 Theriogenology : 1054 -1062.
Yasui, G. S., Fujimoto, T., Arias-Rodriguez, L., Takagi, Y., Arai, K. (2012) The effect of ions and cryoprotectants upon sperm motility and fertilization success in the loach Misgurnus anguillicaudatus. Aquaculture 344–349, 147–152.
Arai K. , 'The effect of ions and cryoprotectants upon sperm motility and fertilization success in the loach Misgurnus anguillicaudatus ' (2012 ) 344–349 Aquaculture : 147 -152.
Yu, D. H., Jiang, S. G., Chen, J. C., Su, T. F. (1999) A preliminary study on activation mechanism of spermatozoa of Japanese pearl oyster, Pinctada martensii. J. Trop. Oceanogr. 18, 5–10.
Su T. F. , 'A preliminary study on activation mechanism of spermatozoa of Japanese pearl oyster, Pinctada martensii ' (1999 ) 18 J. Trop. Oceanogr. : 5 -10.
Yu, D. H., Chen, J. C., Su, T. F., Zhu, H., Jiang, S. G. (1998) A primary study on experimental biology of spermatozoa of Pinctada fucata (Gould). J. Trop. Oceanogr. 17, 83–87.
Jiang S. G. , 'A primary study on experimental biology of spermatozoa of Pinctada fucata (Gould) ' (1998 ) 17 J. Trop. Oceanogr. : 83 -87.
Zhu, J. Q., Wang, W., Ding, L. F. (2012) Ultrastructural observation on oogenesis, vitellogenesis and vitelline membrane formation during yolk-synthesizing stage in Phascolosoma esculenta. Oceanol. et Limnol. Sin. 43, 870–876.
Ding L. F. , 'Ultrastructural observation on oogenesis, vitellogenesis and vitelline membrane formation during yolk-synthesizing stage in Phascolosoma esculenta ' (2012 ) 43 Oceanol. et Limnol. Sin. : 870 -876.
Zhu, J. Q., Wang, W., Ying, X. P., Xu, S. J., Zeng, H. X., Chen, H. Q. (2008) Cytological changes of fertilization and early cleavage in Phascolosoma esculenta. Acta Zool. Sin. 54, 290–298.
Chen H. Q. , 'Cytological changes of fertilization and early cleavage in Phascolosoma esculenta ' (2008 ) 54 Acta Zool. Sin. : 290 -298.
Zhu, J. Q., Wang, W., Xu, S. J., Zeng, H. X. (2007) Spermatogenesis and sperm morphology of Phascolosoma esculenta. Acta Zool. Sin. 53, 733–741.
Zeng H. X. , 'Spermatogenesis and sperm morphology of Phascolosoma esculenta ' (2007 ) 53 Acta Zool. Sin. : 733 -741.
Zhu, J. Q., Ding, L. F., Jiao, H. F., Wang, Y. B. (2006) Effects of environmental factors on spermatozoa motility of Tegillarca granosa. Mar. Sci. 30, 65–68.
Wang Y. B. , 'Effects of environmental factors on spermatozoa motility of Tegillarca granosa ' (2006 ) 30 Mar. Sci. : 65 -68.