Effect of different Salinity levels on the Hatchability and Survival of Brine Shrimp, Artemia salina (Linnaeus, 1758) from Malindi, Kenya

  • Alal, George Wasonga Department of Fisheries and Aquatic Science, University of Eldoret, P.O. BOX 1125-30100, Eldoret
  • Robert, J. Olendi Department of Fisheries and Aquatic Science, University of Eldoret, P.O. BOX 1125-30100,
##article.subject##: Artemia salina, hatchability, survival, Friedman`s analysis, Probit analysis

##article.abstract##

Brine shrimp, Artemia salina (Linnaeus, 1758) has become popular in aquaculture industry as live feed to over 85% of the cultured species around the world. A. salina is a non-selective filter-feeder of high nutritive value which thrives in a wide range of water quality variables under high density, thus it is suitable feed in fin-fish culture. The stocking density in each hatching systems were 700 cysts litre-1, replicated three times. The concentration in hatching tanks was changed every two days. The treatments were maintained at (4 ppt saline solution (freshwater), 28 ppt saline solution (brackish water) and 40ppt saline solution (seawater)) and the pH between 7.8-8.5, 8.2-8.9 and 8.5-9.3 among treatments respectively. A uniform temperature of 28ºC was maintained by thermostat for all the treatments throughout the study period. Non-parametric tests, Friedman’s analysis method were used for hatchability and incubation period and Probit Analysis method used for survival data analysis.  Hatchability of cysts was not significantly different among treatments (p>0.05). However, there was significant difference in the hatching period as compared to salinity levels with the (p= 0.029). Moreover, there was significant difference in the salinity levels on survival of A. salina nauplii cultured for five days with the goodness-of-fit tests (p<0.05) and the test for equal slopes were significant, the comparison of survival were not  similar regardless of the salinity Levels.

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##submissions.published##
2018-03-13
##issue.issue##
##issue.vol## 3 ##issue.no## 4 (2017)
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Articles