Next Article in Journal
Owners’ Perceptions Do Not Match Actual Ground-Dwelling Invertebrate Diversity in Their Gardens
Previous Article in Journal
A Literature Synthesis of Actions to Tackle Illegal Parrot Trade
Article

Effect of Different Salinity Levels on Population Dynamics and Growth of the Cyclopoid Copepod Oithona nana

1
Department of Animal Production, Faculty of Agriculture, Kafrelsheikh University, Kafrelsheikh 33516, Egypt
2
National Institute of Oceanography and Fisheries (NIOF), Cairo 11516, Egypt
3
Animal and Fish Production Department, College of Agricultural and Food Sciences, King Faisal University, P.O. Box 420, Al-Ahsa 31982, Saudi Arabia
4
Fish and Animal Production Department, Faculty of Agriculture (Saba Basha), Alexandria University, Alexandria 21531, Egypt
5
Department of Biology, College of Science, Taif University, P.O. Box 11099, Taif 21944, Saudi Arabia
*
Author to whom correspondence should be addressed.
Academic Editor: Benny Kwok Kan Chan
Received: 9 April 2021 / Revised: 20 April 2021 / Accepted: 27 April 2021 / Published: 29 April 2021
(This article belongs to the Special Issue Larval Biology and Ecology of Marine Invertebrates)
Copepods are one of the most abundant and diverse live food sources for mesopelagic and bathypelagic fishes and crustaceans. They could contribute to the overlap of the transition period from live feed to an artificial weaning diet in marine larvae production. However, the culture conditions still need optimization to provide sufficient production to cover the increasing demand for marine hatcheries. Therefore, the present study investigated the effects of different salinity levels (5, 10, 15, 20, 25, and 30 ppt) on the population growth, growth rate, and population composition (males, females, copepodite, and nauplii ratio) of the marine copepod, Oithona nana. The experiment continued for 15 days, under laboratory-controlled conditions of temperature (27 ± 1 °C), pH (7.7 ± 0.15), and continuous gentle aeration in 30 L glass aquaria. The copepod culture aquaria were supplemented with a mixture of soybean and yeast (0.5 g 10−6 individual−1 24-h−1) as a feed source. The highest significant population growth and population growth rate of O. nana were achieved with a salinity level of 20 ppt. Regarding population composition, O. nana cultured at the salinity level of 20 ppt recorded the highest significant percentages of copepodite and nauplii. The results concluded that copepod, O. nana, is capable of withstanding abrupt changes in the salinity, but there are limits to their tolerance, with an optimal salinity level of 20 ppt. This salinity level achieved the highest population growth and the highest percentages of copepodite and nauplii of marine Copepoda, O. nana. View Full-Text
Keywords: aquaculture; live feeds; salinity; copepodite; growth; population composition aquaculture; live feeds; salinity; copepodite; growth; population composition
Show Figures

Figure 1

MDPI and ACS Style

Magouz, F.I.; Essa, M.A.; Matter, M.; Mansour, A.T.; Gaber, A.; Ashour, M. Effect of Different Salinity Levels on Population Dynamics and Growth of the Cyclopoid Copepod Oithona nana. Diversity 2021, 13, 190. https://0-doi-org.brum.beds.ac.uk/10.3390/d13050190

AMA Style

Magouz FI, Essa MA, Matter M, Mansour AT, Gaber A, Ashour M. Effect of Different Salinity Levels on Population Dynamics and Growth of the Cyclopoid Copepod Oithona nana. Diversity. 2021; 13(5):190. https://0-doi-org.brum.beds.ac.uk/10.3390/d13050190

Chicago/Turabian Style

Magouz, Fawzy I., Mohamed A. Essa, Mustafa Matter, Abdallah T. Mansour, Ahmed Gaber, and Mohamed Ashour. 2021. "Effect of Different Salinity Levels on Population Dynamics and Growth of the Cyclopoid Copepod Oithona nana" Diversity 13, no. 5: 190. https://0-doi-org.brum.beds.ac.uk/10.3390/d13050190

Find Other Styles
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop