Effect of feeding scheme and prey density on survival and development of Chinese mitten crab Eriocheir sinensis zoea larvae

Abstract

The e¡ect of feeding scheme and prey density on survival and development of Eriocheir sinensis zoea larvae was studied in three experiments. Di¡erent combinations and densities of rotifers (Brachionus rotundiformis) and newly hatched Artemia nauplii were fed to zoea larvae. Average survival at each stage, larval development (larval stage index, LSI), duration of zoeal stage and individual megalopa dry weight were compared among treatments. This study revealed that, under the experimental conditions, rotifers should be replaced with Artemia between the zoea 3 (Z3) and the zoea 4 (Z4) stage. The optimal rotifer feeding densities for zoea 1 (Z1) and zoea 2 (Z2) were 15 and 20 mL À 1 respectively, while the optimal Artemia feeding density for Z3, Z4 and zoea 5 (Z5) was 3, 5 and 8 mL À 1 respectively. Further trials in production scale are recommended.

The effect of poly-β-hydroxybutyrate on the performance of Chinese mitten crab (Eriocheir sinensisMilne-Edwards) zoea larvae

“…In a first experiment, the effect of either encapsulating PHB into the live food or adding PHB directly to the rearing water on the survival and the larval development of E. sinensis was investigated. After transfer of the Z2 larvae to the plastic beakers on DAH 4, the larvae were fed three times daily (8:00, 14:00 and 22:00 hours) and prey density was kept as suggested by Sui, Wille, Wu, Cheng and Sorgeloos (): 15 rotifers mL −1 for Z2, 10 rotifers +0.5 Artemia mL −1 for Z3, 1 Artemia mL −1 for Z4 and 1.5 Artemia mL −1 for Z5. Prior to feeding, the density of rotifers and Artemia remaining in the larval rearing beakers was estimated by counting the number of prey in three subsamples of 5 mL from the rearing medium.…”

Establishing larval feeding regimens for the decorator crab Camposcia retusa : Effects of live prey types and density on larval survival and development

“…Similarly, in southern rock lobster, Jasus edwardsii, phyllosoma larvae showed prolonged development when live prey was too small (Ritar et al, 2003). Indeed, the relationship between prey size and larvae is a critical factor to consider in larval feeding, the disproportion of the size between food particles and larval feeding appendages may incapacitate the larvae to effectively capture the prey or despite larvae can capture and consumed the prey, they would eventually die due to unable to acquire a sufficient energy to sustain normal development (Guarizo et al, 2020;Ritar et al, 2003;Ruscoe et al, 2004;Sui et al, 2008).…”

Effect of Copper-EnrichedArtemiaon Growth, Body Composition, Antioxidant Enzyme Activities, and Osmotic Stress Tolerance of Chinese Mitten CrabEriocheir sinensisLarvae

“…From zoea stage 3 (Z3) onward, larvae were fed with Artemia enriched with different Cu levels twice a day at 0800 h and 2200 h. The Artemia densities were kept at 3 individuals/mL at Z3, 5 individuals/mL at Z4, and 8 individuals/mL at Z5, which was similar to densities used by Sui et al (2008). Each treatment consisted of 6 replicated beakers containing 1 L diluted seawater (20 g/L) stocked with 100 Z3 larvae to determine the survival rate and larval stage index.…”