Salinity Tolerance of Young American Shad, Alosa sapidissima

1973 ◽  
Vol 14 (3) ◽  
pp. 207 ◽  
Author(s):  
Mark E. Chittenden
Keyword(s):  
Salinity Tolerance ◽  
American Shad ◽  
Alosa Sapidissima

scholarly journals The ontogeny of salinity tolerance in the American shad, Alosa sapidissima

1997 ◽  
Vol 54 (1) ◽  
pp. 182-189 ◽  
Author(s):  
J Zydlewski ◽  
S D McCormick
Keyword(s):  
Atpase Activity ◽  
Salinity Tolerance ◽  
American Shad ◽  
Plasma Sodium ◽  
Term Survival ◽  
Alosa Sapidissima ◽  
Seawater Tolerance ◽  
Plasma Chloride ◽  
Survival And Growth

Larval and juvenile American shad (Alosa sapidissima) raised from eggs in the laboratory were subjected to biweekly 24-h seawater (35 ppt) challenges. There was no survival in seawater before 36 days post-hatch, and most mortalities occurred within 2 h of transfer. Twenty-four hour survival reached 89% in seawater at 45 days post-hatch (when larval-juvenile metamorphosis occurred), 96% at 58 days post-hatch, and 92-100% from 58 to 127 days post-hatch. Survival in seawater for 24 h was a good indicator of long-term survival and growth. Seawater tolerance was associated with gill development and increased gill Na + ,K + -ATPase activity, which occurred at the onset of the larval-juvenile metamorphosis (3 months prior to the peak of migration). Gill Na + ,K + -ATPase activity increased threefold in juvenile shad acclimated to 35-ppt seawater, reached peak levels 5 days after transfer, and remained elevated with respect to controls. Plasma sodium and chloride increased 12 and 11%, respectively, within 48 h of seawater exposure. Plasma sodium recovered to initial levels and plasma chloride stabilized at a level 10% higher than initial levels after 5 days. Ionic perturbations that occurred at elevated salinities stabilized when gill Na + ,K + -ATPase activity increased.

scholarly journals Evasive responses of American shad (Alosa sapidissima) to ultrasonic stimuli

2003 ◽  
Vol 4 (2) ◽  
pp. 25-30 ◽  
Author(s):  
Dennis T. T. Plachta ◽  
Arthur N. Popper
Keyword(s):  
American Shad ◽  
Alosa Sapidissima
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