Effect of pH on survival, egg production and feeding of Pseudodiaptomusannandaleia key fish food organism-a laboratory study

Calanoid copepods are key components of the marine food web and the food sources of many larval fishes and planktivores, and grazers of phytoplankton. Understanding the ranges of major environmental variables suitable for their
growth is essential to maintain the balance between trophic links and resources protection. The effects of exposure to pH ranging from 4.2 to 9.2 on survival, egg production and feeding rate were determined for adult copepod Pseudodiaptomusannandalei. Survival was maximum at pH 8.2 (control) and the optimum pH ranged between 6.2 and 8.2. The overall feeding rate fluctuated between 208-650 cells/ ml. The egg production rate (EPR) varied from 0 – 44±3.22 eggs/female. It is inferred that exposure to lower pH caused a significant decrease in both survival and EPR. However, feeding rate was not affected considerably. Our experimental results prove that pH stress has considerable effect on survival and fecundity of P. annandalei. However, feeding rate stayed
stable in most of the pH tested.

Bhuvaneshwari N., Santhanam P., Nandakumar R., Jayalakshmi T., Ananth S., Kumar S. D. & Prasath B. B., 2019. Effect of pH on survival, egg production and feeding of Pseudodiaptomusannandaleia key fish food organism-a laboratory study. Biodiversity and Aquatic Research 1 (1): 1-4. Article.

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