Behavior and ultrastructure of sensory organs in rotifers

Clément, Pierre; Wurdak, Elizabeth; Amsellem, Jacqueline

doi:10.1007/978-94-009-7287-2_13

Cited by 25 publications

(24 citation statements)

References 30 publications

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“…The present study showed similar results demonstrating that supplemented L-carnitine in culture medium has resulted in significant responses in reproduction and individual growth of enriched rotifers. The mechanical and chemical receptors of rotifers are sensitive to environmental stimulation and are in direct contact with external medium (Clement et al, 1983). Thus, it is possible that rotifers exposed to a medium enriched with L-carnitine are affected directly.…”

Section: Discussionmentioning

confidence: 99%

Effect of L-carnitine enrichment on the rotifer and influences on clownfish larvae

Kumar

Sahu

2015

SL J Food & Agric

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Enrichment has shown considerable influence on the population growth, reproduction and individual growth of rotifer (Brachionus plicatilis Müller, 1786) and its utility on the clownfish larvae (Amphiprion ocellaris Cuvier 1830). Using the culture medium of microalgae (Nannochloropsis salina D.J. Hibberd 1981) as the control, rotifers were enriched by dissolving in S-presso (for short term enrichment) or L-carnitine supplements. The study was conducted in three replicates for five and 10 days of batch culture. On day-4, the population density of rotifers exposed to 1, 10 and 100 mg l -1 L-carnitine was significantly increased (p<0.001) by 43, 39 and 54%, respectively, compared to the control. The population density in these three treatments also increased on day-2, day-3 and day-5 compared to the 1000 mg L -1 treatment (p<0.05) and control (p<0.05). The body length (p<0.001) and width (p<0.05) were significantly reduced in the 1000 mgL -1 treatment compared to the control. The mean values of total unsaturated fatty acids (PUFA's, HUFA's and n-3 fatty acids) and the ratio of n-3/n-6, DHA/EPA, EPA/AA were significantly higher (p<0.05) in the rotifers enriched with L-carnitine compared to S-presso and algae. Larvae fed using rotifer enriched with Lcarnitine gained the maximum growth (65.7±1 mg), followed by those enriched with S-presso (42.2±0 mg). In L-carnitine treatment, metamorphosis took only 9 days, followed by the control. In L-carnitine and S-presso units, the clownfish larvae took only three days for the first pigmentation compared to four days in N. salina (control) and 10 days with S-presso. Rotifers enriched with L-carnitine showed the highest survival rate (70 %) of the clownfish followed by the control (68%) and S-presso (52%). The results suggested that L-carnitine could be a positive factor to enhance the rotifer production and also its utilization in clownfish larval culture.

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Section: Discussionmentioning

confidence: 99%

Effect of L-carnitine enrichment on the rotifer and influences on clownfish larvae

Kumar

Sahu

2015

SL J Food & Agric

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“…The paired dorsal papillae (dp) that also resemble the pair of dorsal ciliated organs or the multiciliated lateral pits of the chordoid larva (Funch, 1996) might be comparable to dorsal or lateral antennae seen in monogonont rotifers (Clément et al, 1983;Clément and Wurdak, 1991). A cycliophoran male has a pair of frontal palps (fp) that are aligned closely together with the frontalia (fr).…”

Section: Discussionmentioning

confidence: 99%

“…consisting of several cell types that line the copulatory organ (Aloia and Moretti, 1973b;Gilbert, 1983). The copulatory organ of many rotiferan males bears a ciliated crown around the genital pore (Clément et al, 1983), while the penis of the cycliophoran male is cuticular and without cilia. Also, the ultrastructure and the number of prostate glands differ between the reproductive systems (Aloia and Moretti, 1973b).…”

Section: Discussionmentioning

confidence: 99%

Untitled

2003

Journal of Morphology

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This study clarifies the identity and development of the male in the life cycle of Symbion pandora. The male is not produced directly by the feeding stage, as previously thought, but arises as a distinct individual from budding cells inside an intermediate stage named the Prometheus larva. The morphology and the development of the two distinct stages are described with light and electron microscopy. Furthermore, the following terminology is suggested to clearly distinguish between the different individuals: 1) the Prometheus larva, which is the free-swimming individual being produced inside the feeding stage; 2) the attached Prometheus larva on the feeding stage, which mostly degenerates following settlement, except for the internal budding cells; and 3) the dwarf male, which is the ciliated, sexually mature stage. The budding cells inside the attached Prometheus larva usually develop two internal dwarf males. Each dwarf male is heavily ciliated and has a well-developed nervous system with a relatively large brain, numerous gland and muscle cells, testis with bundles of sperm, and one penial structure. The male lacks a gut, as in the other free stages in the life cycle of Symbion pandora. This study also indicates that the dwarf male is freed from the attached Prometheus larva. Copulation, which has not been observed yet, probably takes place between a free-swimming male and the female, either while the female is released or afterwards.

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“…Most rotifers have mechano-and chemoreceptors, which are sensitive to environmental stimulations and in direct contact with external medium [4]. …”

Section: Resultsmentioning

confidence: 99%

Effects of Myostatin Prodomains on the Reproduction of Rotifer Brachionus rotundiformis

Jo¹,

Jin²

2012

Journal of Life Science

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Myostatin (MSTN), a member of the transforming growth factor (TGF)-beta family, is a potent negative regulator of skeletal muscle growth and maintenance. The MSTN prodomain inhibits MSTN biological activity. The rotifer Brachionus rotundiformis is an excellent primary live feed for fish larvae in aquaculture; however, it is not known whether the rotifer expresses MSTN and the MSTN prodomain along with its activity. The objective of this study was to examine the effects of recombinant MSTN prodomains. Individual cultures of the rotifer B. rotundiformis were carried out to determine the effect of recombinant MSTN prodomains (pMALc2x-poMSTNpro and pMALc2x-sMSTNpro) on the pre-reproductive phase, reproductive phase, post-reproductive phase, offspring, lifespan, fecundity, and male ratio. In addition, a population culture of the rotifer was performed to confirm the effects of pMALc2x-poMSTNpro and pMALc2x-sMSTNpro on population growth. The results showed that the rotifer treated with pMALc2x-pMSTNpro had a reduced pre-reproductive phase at higher concentrations (1, 2, and 4 μg/ml) compared to the non-treated control group. Moreover, the pMALc2x-sMSTNpro treated rotifer effectively decreased the pre-reproductive phase at a lower concentration (0.25 μg/ml) compared to the pMALc2x-pMSTNpro treated and control group. Interestingly, pMALc2x-poMSTNpro and pMALc2x-sMSTNpro significantly increased the population of B. rotundiformis.

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Behavior and ultrastructure of sensory organs in rotifers

Cited by 25 publications

References 30 publications

Effect of L-carnitine enrichment on the rotifer and influences on clownfish larvae

Effect of L-carnitine enrichment on the rotifer and influences on clownfish larvae

Untitled

Effects of Myostatin Prodomains on the Reproduction of Rotifer Brachionus rotundiformis

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