Vol. 60, 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
Mohsen M. El-Sherbiny1,2,* and Ali Al-Aidaroos1
of Marine Biology, Faculty of Marine Science, King Abdulaziz
University, Jeddah 21589, Saudi Arabia. *Correspondence: Email:
firstname.lastname@example.org (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
33ºC). 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 27ºC, then declined with increasing temperatures (at 30 and 33ºC).
In the second experiment when water enriched with algal culture, EPRs
were significantly greater (maximum EPR: 63.9 eggs female-1 d-1 at 27°C) than that incubated in ambient water with natural food (maximum EPR: 17.4 eggs female-1 d-1 at 21°C). 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.
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.