Zoological Studies

Vol. 60, 2021

(update: 2021.07.12)
 

Preliminary Observations on the Effect of Temperature and Food Concentration on the Egg Production Rate and Hatching Success of Acartia amboinensis from the Central Red Sea

Mohsen M. El-Sherbiny1,2,* and Ali Al-Aidaroos1

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1Department of Marine Biology, Faculty of Marine Science, King Abdulaziz University, Jeddah 21589, Saudi Arabia. *Correspondence: Email: ooomar@kau.edu.sa (El-Sherbiny). Tel: +966562669972.
2Department of Marine Sciences, Faculty of Science, Suez Canal University, Ismailia 41522, Egypt

Received 2 August 2020 / Accepted 1 July 2021
Communicated by Ryuji Machida

The effect of temperature and food concentration on the egg production rate (EPR) of a tropical calanoid copepod Acartia amboinensis were studied from the coastal waters of the central Red Sea during March 2017. In the first experiment, adult females were incubated in glass bottles that pre-filled with screened seawater containing a natural assemblage of phytoplankton. In the second experiment, the species were incubated in glass bottles that enriched with different concentrations of Chaetoceros muelleri along with natural assemblage of phytoplankton. Both the experimental setups were then exposed to different temperatures (21, 24, 27, 30 and 33C). The daily EPR was significantly varied both in between different temperatures as well as the various food concentrations (p < 0.05). Within the natural food assemblage (Exp. 1), the EPR increased gradually to a maximum mean of 13.7 eggs female-1 d-1 at 27C, then declined with increasing temperatures (at 30 and 33C). In the second experiment when water enriched with algal culture, EPRs were significantly greater (maximum EPR: 63.9 eggs female-1 d-1 at 27C) than that incubated in ambient water with natural food (maximum EPR: 17.4 eggs female-1 d-1 at 21C). The hatching rate fluctuated between 42.4% and 88.6%. The study revealed that EPR of Acartia amboinensis responded rapidly to change in food availability, suggesting the extreme food limitation in the central Red Sea.

Key words: Acartia amboinensis, Copepods, Egg production rate, Hatching rate; Red Sea.

Citation: El-Sherbiny MM, Al-Aidaroos A. 2021. Preliminary observations on the effect of temperature and food concentration on the egg production rate and hatching success of Acartia amboinensis from the central Red Sea. Zool Stud 60:58.