Ingestion ofArtemianauplii by Chinese mitten crabEriocheir sinensiszoea larvae

Abstract

A series of ingestion trials were conducted to determine the ingestion rate of Artemia nauplii by Eriocheir sinensis zoea larvae with increasing densities of Artemia and with or without rotifers as a co‐feed. At each zoeal stage, 10 groups of 10 larvae were reared individually in glass beakers and fed with increasing densities of newly hatched Artemia nauplii (0.5, 2.5, 5, 10 and 20 individual (ind.) mL−1) with or without rotifers (15–25 ind. mL−1) as a co‐feed. The average number of ingested Artemia was measured over 24 h. In addition, the average larval development rate (Larval Stage Index, LSI) over a longer period (time needed for the best treatment to reach 100% moult or metamorphosis to the next larval stage) was compared. The results showed that Artemia ingestion rate of E. sinensis larvae increased with increasing prey densities and larval development, and had a significantly negative correlation with rotifer consumption for all zoeal stages. Rotifers as an alternative prey significantly affected the intake of Artemia at early larval stages (Z1 and Z2) and promoted LSI at a lower Artemia density. Further experiments are needed to clarify the effect of prey density on survival and larval development when larvae are reared communally.

The Predation of Artemia Nauplii by the Larvae of the Amazon River Prawn, Macrobrachium amazonicum (Heller, 1862), is Affected by Prey Density, Time of Day, and Ontogenetic Development

“…Palaemon serratus [Yúfera and Rodríguez 1985a], Palaemonetes varians [Yúfera and Rodríguez 1985b], Metapenaeus ensis [Chu and Shing 1986], Lucifer faxoni [Vega‐Pérez et al 1996], and Macrobrachium rosenbergii [Barros and Valenti 2003]), crabs (e.g. Ranina ranina [Minagawa and Murano 1993], Scylla serrata [Suprayudi et al 2002] and Eriocheir sinensis [Sui et al 2009]), mysids ( Rhopalophthalmus africana [Kouassi et al 2006]), and lobsters ( Nephrops norvegicus [Pochelon et al 2009]). However, in our study with M. amazonicum , this response was only observed during the night.…”

“…Increased daytime feeding behavior has been observed in the larvae of the crustaceans Ranina ranina (Minagawa 1994), Lucifer faxoni (Vega‐Pérez et al 1996), Clausocalanus furcatus (Uttieri et al 2008), and Eriocheir sinensis (Sui et al 2009). This behavior was attributed to the increase in swimming activity in the presence of light (Uttieri et al 2008; Sui et al 2009). Recently, Uttieri et al (2008) observed that the larvae of Clausocalanus furcatus engage in random movements to explore their surroundings, enhancing the success of prey capture.…”

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

“…Indeed, previous studies have shown a positive relationship between ingestion rate and prey density until a saturation level is reached in various decapod larvae, including crabs E. sinensis (Sui et al, 2009),…”

“…Indeed, previous studies have shown a positive relationship between ingestion rate and prey density until a saturation level is reached in various decapod larvae, including crabs E . sinensis (Sui et al, 2009), Hyas araneus (Anger & Dietrich, 1984), Ranina ranina (Minagawa & Murano, 1993) and shrimps Lysmata wurdemanni (Zhang et al, 1998), Penaeus kerathurus (Yúfera et al, 1984) and Penaeus monodon (Loya‐Javellana, 1989). The importance of prey density is probably particularly relevant to early larvae who typically have weak swimming ability (Lumasag et al, 2007).…”

“…Interestingly, in the same experiment, as Artemia density further increased to 15 ind./ml, larval survival decreased significantly. This probably can be explained by excess number of Artemia degraded water quality (Sui et al, 2009; Zhang et al, 1998). Dan, Ashidate, et al (2016) also reported that an excessive high Artemia density could induce morphology abnormality in larvae of the last stage zoeal larvae of swimming crab Portunus trituberculatus , leading to mortalities during metamorphose.…”