First-feeding by European eel larvae: A step towards closing the life cycle in captivity

Butts, Ian A.E.; Sørensen, Sune Riis; Politis, Sebastian Nikitas; Tomkiewicz, Jonna

doi:10.1016/j.aquaculture.2016.07.028

Cited by 40 publications

(44 citation statements)

References 48 publications

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“…Eggs were considered alive when the first somite segmentation was visible. Oversized, dark, discoloured eggs/embryos, or those with abnormities in the cytoplasm were considered dead (Sørensen, Butts, et al, ). Eggs/embryos were mixed for 3 s before sampling three aliquot samples.…”

Section: Methodsmentioning

confidence: 99%

“…In addition, controlled laboratory studies have identified optimal environmental conditions for improved early offspring performance, that is light (Politis, Butts, & Tomkiewicz, ), salinity (Sørensen, Butts, Munk, & Tomkiewicz, ) and temperature (Politis et al, , ). Together, this new innovative technology has enabled the production of copious amounts of offspring reaching the first‐feeding stage (Butts, Sørensen, Politis, & Tomkiewicz, ; Sørensen, Tomkiewicz, et al, ). On the contrary, little is known about parental factors, via genetic selection or breeding, and if or how they impact early life history (ELH) performance traits.…”

Section: Introductionmentioning

confidence: 99%

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Effect of parental origin on early life history traits of European eel

Benini¹,

Politis

Kottmann

et al. 2018

Reprod Domestic Animals

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Establishment of European eel (Anguilla anguilla) hatchery production will rely on selectively bred individuals that produce progeny with the best traits in successive generations. As such, this study used a quantitative genetic breeding design, between four females and nine males (four wild-caught and five cultured), to investigate the effect of paternal origin (wild-caught vs. cultured) and quantify the relative importance of parental effects, including genetic compatibility, on early life history (ELH) performance traits (i.e. fertilization success, embryonic survival at 32 hr post-fertilization, hatch success and larval deformities at 2 days post-hatch) of European eel. Wild-caught males had higher (56%) spermatocrit values than cultured males (45%), while fertilization success, embryonic survival, hatch success and larval deformities were not significantly impacted by paternal origin. This demonstrates that short-term domestication of male eels does not negatively affect offspring quality and enables the consideration of cultured male broodstock in future breeding programmes. Moreover, paternity significantly explained 9.5% of the variability in embryonic survival, providing further evidence that paternal effects need to be taken into consideration in assisted reproduction protocols. Furthermore, maternity significantly explained 54.8% of the variation for fertilization success, 61.7% for embryonic survival, 88.1% for hatching success and 62.8% for larval deformities, validating that maternity is a major factor influencing these "critical" ELH traits. At last, the parental interaction explained 12.8% of the variation for fertilization success, 8.3% for embryonic survival, 4.5% for hatch success and 20.5% for larval deformities. Thus, we conclude that eggs of one female can develop more successfully when crossed with a compatible male, highlighting the importance of mate choice for successful propagation of high-quality offspring. Together, this knowledge will improve early offspring performance, leading to future breeding programmes for this critically endangered and economically important species.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of parental origin on early life history traits of European eel

Benini¹,

Politis

Kottmann

et al. 2018

Reprod Domestic Animals

Self Cite

View full text Add to dashboard Cite

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“…Thus, it is necessary to improve techniques for the production of high‐quality eggs to make mass production of larvae possible (Di Biase et al., ). Indeed, if this target could be reached, research could focus and concentrate on larval weaning techniques, as first successful early feeding of European eel larvae has already been obtained (Butts, Sørensen, Politis & Tomkiewicz, ; Di Biase et al., ).…”

Section: Introductionmentioning

confidence: 99%

Effect of aromatable androgen (17-methyltestosterone) on induced maturation of silver European eels (Anguilla Anguilla ): Oocyte performance and synchronization

et al. 2017

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The reproductive performances of silver European eel in term of gonad development and egg production, employing slow-release implants with the androgen 17-MT (1 mg) in combination with traditional weekly injection of carp pituitary extract (CPE) was evaluated. Wild female European eels (Anguilla anguilla) underwent a standard induction protocol with CPE and were randomly divided into three groups (N-group, no implant; Y-group, with implant; and control, C-group, no treatment).The results showed that 17-MT-treated females (Y-group) reproduced spontaneously about 6 weeks earlier than the N-group females with a saving of almost 40% in CPE and time of induction. Concerning artificial induction of maturation in female silver eels, our study demonstrated that they positively respond to androgen exposure also in terms of eggs productivity. Indeed, Y-group was more productive than N-group: in Y-group, 11 eels ensured an eggs production that exceeded 50% of initial body weight (BW), whereas in N-group only three eels have exceeded this value. The results suggest that 17-MT should be considered in future protocols for the improvement of the artificial reproduction of female silver European eels.

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“…In the wild, it is believed that these larvae will be passively transported by the Gulf Stream towards Europe. Within a few days (~3 days) the oral opening of the larvae will appear and after ~14 days the larvae will be capable of feeding (Sørensen et al 2016), although first feeding has not been observed before day 16 (Butts et al 2016). The natural diet of these larvae is unknown, and their teeth seem unpractically large and are protruding out from the mouth (Fig.…”

Section: European Eel Life Cyclementioning

confidence: 99%

“…This achievement may not be far away as European eel larvae production has steadily improved over the years and the first successful exogenous feeding of European eel larvae has been achieved (Butts et al 2016). The current state-ofthe-art of European eel maturation involves a weekly intraperitoneal injection of recombinant hCG for the males (Asturiano et al 2005(Asturiano et al , 2006Gallego et al 2012;Herranz-Jusdado et al 2019).…”

Section: Artificial European Eel Maturationmentioning

confidence: 99%

Development of innovative methods for induction of European eel (Anguilla anguilla) spermatogenesis

Rozenfeld¹

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First-feeding by European eel larvae: A step towards closing the life cycle in captivity

Cited by 40 publications

References 48 publications

Effect of parental origin on early life history traits of European eel

Effect of parental origin on early life history traits of European eel

Effect of aromatable androgen (17-methyltestosterone) on induced maturation of silver European eels (Anguilla Anguilla ): Oocyte performance and synchronization

Development of innovative methods for induction of European eel (Anguilla anguilla) spermatogenesis

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