Allowable Salinity for Survival of Three Types ofMacrobrachium nipponense Larvae.
|
Accession number;01A0448111
|
| Title;Allowable Salinity for Survival of Three Types ofMacrobrachium nipponense Larvae. |
| Author;
IMAI TADASHI
(Tokaidai Daigakuinkaiyogakukenkyuka)
AKIYAMA NOBUHIKO
(Tokai Univ., Sch. of Mar. Sci. and Technol.)
KOSAKA MASAYA
(Tokai Univ., Sch. of Mar. Sci. and Technol.)
|
Journal Title;Suisan Zoshoku
|
Journal Code:Y0285A
|
ISSN:0371-4217
|
|
VOL.49;NO.1;PAGE.35-40(2001)
|
| Figure&Table&Reference;FIG.3, REF.15 |
| Pub. Country;Japan |
| Language;Japanese |
| Abstract;The salinity assuring Macrobrachium nipponense for surviving up to postlarval stage, and the duration for the development were compared among the three types of freshwater lakes, brackishwater lake and rivers. The larvae of freshwater lake type reached to the postlarval stage even in freshwater, but the survival rate was considerably lower than those reared in the water of 3.3PSU or higher, upper limit of optimum salinity varied from 13.4 to 23.4PSU by the locality. The larvae of river type survived at higher salinity than the freshwater lake type, between 10PSU and 23.4 to 26.7PSU. Also, this type survived in seawater. Allowable salinity for high survival of brackishwater lake type ranges from 3.3 to 23.4PSU, similar to that of freshwater lake type. Durations required to moult into the postlarval stage were 15 to 16 days after hatching for the freshwater lake type in the optimal salinity, but longer in freshwater. The freshwater lake type spent shorter duration than river type, 24 to 32 days, but similar to brackishwater lake type, 15 day. These results suggest that the brackishwater and river types adapted to the larval habitat in brackishwater, while the freshwater lake type are on the way adapting to freshwater condition throughout the life. (author abst.) |
|
|
|
Related Articles;
|
|
