Population Dynamics, Fecundity and Fatty Acid Composition of Oithona nana (Cyclopoida, Copepoda), Fed on Different Diets

Abstract

The marine copepod species Oithona nana is considered as one of the most successfully mass cultured Cyclopoida species in marine hatcheries. This study investigated the effects of four feed diets (soybean, yeast, rice bran, and corn starch) on the population growth, growth rate, population composition, fecundity, and fatty acid composition of native isolated Cyclopoida copepod species O. nana. The experiment was continued for 15 days and the copepods were fed on one of the four diets with a concentration of 1 g 10−6 individual day−1. The results revealed that corn starch was found to be the most supportive diet for population growth and population growth rate. For nutritional value, copepods fed on rice bran were detected to have the highest content of MUFA, PUFA, and the lowest SFA and SFA/UFA ratio; more importantly, the rice bran diet was the only treatment that showed C20:5ω3. Moreover, copepods fed on rice bran showed the highest significant female fecundity, copepodite, and nauplii percent. Finally, the protocols described in the current study concluded that the dry feeds, especially corn starch, are very useful and applicable in hatcheries for maximizing the fecundity and density of Cyclopoida copepod species, O. nana.

Impact of Commercial Seaweed Liquid Extract (TAM®) Biostimulant and Its Bioactive Molecules on Growth and Antioxidant Activities of Hot Pepper (Capsicum annuum)

“…Accordingly, seaweed extracts are strongly recommended to assist organic agriculture due to their very promising stable measures [ 3 , 5 , 6 , 7 ]. Native aquatic species should be tested for their industrial and biotechnological potential as a source of bioactive compounds [ 48 , 49 , 50 , 51 , 52 , 53 ].…”

Effect of a New Feed Daphnia magna (Straus, 1820), as a Fish Meal Substitute on Growth, Feed Utilization, Histological Status, and Economic Revenue of Grey Mullet, Mugil cephalus (Linnaeus 1758)

“…Zooplankton is the main source of fish feed in their early life stages [2,3]. With the increase in the number of fish farms, the need for zooplankton has increased and the trend of cultivating zooplankton, as live food, has increased significantly in the last decades [4]. Several zooplankton species were successfully cultured and utilized in aquaculture, include rotifer, Brachionus plicatilis [5], Artemia franciscana [6], amphipod, Gammarus pulex [3], copepods, Oithona nana [4], and Daphnia magna [7].…”

“…With the increase in the number of fish farms, the need for zooplankton has increased and the trend of cultivating zooplankton, as live food, has increased significantly in the last decades [4]. Several zooplankton species were successfully cultured and utilized in aquaculture, include rotifer, Brachionus plicatilis [5], Artemia franciscana [6], amphipod, Gammarus pulex [3], copepods, Oithona nana [4], and Daphnia magna [7]. For many nutritional aspects [8,9], algal cells are the basic and the recommended food item for zooplankton [5,6], while, several food items have been utilized in feeding for different zooplankton species, include agriculture, industrial waste products, and animal manures [10][11][12].…”

Population growth of microcrustaceans in water from habitats with differing salinities

“…The final concentration of yeast added to the glasses was 4 * 10 4 cells per ml, though we did not measure the decrease in concentration as the animals fed during a day. Although yeast is not an optimal food for any of our study species, it is an accepted food source for all of these groups ( Maguire, 1960 ; Bouchnak & Steinberg, 2010 ; Miah et al, 2013 ; Magouz et al, 2021 ). To maintain the cultures, half the water from the glass was removed with a transfer pipette every 3 days, making sure to not suck up any invertebrates.…”