Manipulating the timing of maturation and competence for fertilization and development of oocytes from the semelparous polychaeteNereis(Neanthes)virensSars

Rees, Simon W.; Olive, P. J. W.

doi:10.1080/07924259.2000.9652441

Cited by 3 publications

(6 citation statements)

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“…This highlights the need to understand better the molecular changes that are taking place during the later stages of maturation in Nereidae and especially to understand the late-acting environmental cues (Rees and Olive, 2000) which may coordinate the later stages of oogenesis and the linkage between the onset of competence for fertilisation and spawning. Sperm-fertilised oocytes took longer to reach cleavage than those that developed spontaneously; this suggests that the parthenogenetic development pathway is shorter than that of standard fertilisation, and that certain early stages are by-passed.…”

Section: Discussionmentioning

confidence: 98%

“…Rees and Olive (2000) suggested that there may be late acting environmental signals which influence these later stages of sexual maturation but the mechanisms have not been elucidated.…”

Section: Introductionmentioning

confidence: 97%

“…Oocytes may appear competent, i.e., have achieved the terminal size and have a clearly developed cortical region (Brafield and Chapman, 1967;Bass and Brafield, 1972), but may not fertilise when viable sperm is present. Late acting environmental signals as suggested by Rees and Olive (2000) may therefore induce in oocytes a state of competence to fertilise. Such signals may be photoperiodic, hormonal or lunar.…”

Section: Introductionmentioning

confidence: 98%

“…The capability of pre-spawned oocytes to fertilise is achieved progressively in early spring (Rees and Olive, 2000), but what controls this onset of fertilisability is unclear. Oocytes may appear competent, i.e., have achieved the terminal size and have a clearly developed cortical region (Brafield and Chapman, 1967;Bass and Brafield, 1972), but may not fertilise when viable sperm is present.…”

Section: Introductionmentioning

confidence: 98%

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Impact of pH on oocyte fertilisation and the overrun of meiotic checkpoints leading to parthenogenetic development inNereis virens

Bouch¹,

Olive²

2005

Invertebrate Reproduction & Development

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Whilst developing a fertilisation assay to quantify the onset of fertilisability in oocytes from cultured Nereis virens, development through to the blastula stage was observed within the negative control. In the absence of sperm, some oocytes re-initiated the cell cycle without fertilisation which is the usual cue in this species. Investigations showed that a lower pH of 6.6 significantly increased the incidence of this parthenogenetic development which was also observed to be more rapid than was observed in normal sperm fertilised development. Cleavage was reached within 3 h if no sperm were present, but took longer when the oocytes were fertilised with sperm. The parthenogenetic development is symptomatic of a breakdown between the environmental cues that would cause final maturation and spawning in wild animals and the re-initiation of meiosis. In culture systems, where sufficient environmental cues may be lacking, oocytes can attain an overripe "trigger happy" state where minor shocks can initiate development in the absence of sperm. The avoidance of this state in cultured animals is therefore an important management objective.

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Section: Discussionmentioning

confidence: 98%

“…Rees and Olive (2000) suggested that there may be late acting environmental signals which influence these later stages of sexual maturation but the mechanisms have not been elucidated.…”

Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 98%

See 2 more Smart Citations

Impact of pH on oocyte fertilisation and the overrun of meiotic checkpoints leading to parthenogenetic development inNereis virens

Bouch¹,

Olive²

2005

Invertebrate Reproduction & Development

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“…data). It has been demonstrated that a key event is the response to a critical photoperiodic threshold in the autumn (Olive et al 1998, Rees & Olive 1999 though the time of breeding may also be modified by the environmental conditions experienced after the time of this key transition (Rees & Olive 2000).…”

Section: Discussionmentioning

confidence: 99%

Pre-emptive competition as a selective pressure for early reproduction in the polychaete Nereis virens

Lewis¹,

Olive²,

Bentley³

2003

Mar. Ecol. Prog. Ser.

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Reproduction in the semelparous polychaete Nereis virens occurs at a time of year when seawater temperatures are lower than the optimum temperatures for fertilization and larval development and at a time when seawater temperatures are rising. This study assesses the possible role of intra-specific competitive interactions between settling N. virens post-larvae as a selective pressure for 'early' reproduction. A series of laboratory competition experiments were conducted between 2 cohorts of N. virens post-larvae, under a range of environmental conditions. Significant pre-emptive competition between settling post-larvae was recorded at 15°C, whereby a survival advantage was gained via prior residence with early larval settlers out-competing later arrivals. This competitive interaction was reduced at lower temperatures and no significant effect was measured at 5°C. An increase in age difference between the 2 cohorts of post-larvae increased the competitive effect, whilst photoperiod regime and food availability had no significant effect on the outcome of these experiments. Intra-specific competition was greatest at the temperatures at which maximum fertilization and development are known to occur, but was reduced at the temperature range at which spawning occurs in the field. It is suggested, therefore, that pre-emptive competition between settling post-larvae forms a strong selective pressure for breeding early at a time of year when temperatures are below the optimum for fertilization and development. KEY WORDS: Polychaeta · Pre-emptive competition · Nereis virens · Seasonal reproductionResale or republication not permitted without written consent of the publisher

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Survival, growth and biomass of mud polychaete Marphysa iloiloensis (Annelida: Eunicidae) under different culture techniques

Mandario

2020

Aquac Res

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Polychaetes are commercially exploited as fishing bait and supplemental diet to crustacean and finfish broodstock. However, scarcity of supply and biosecurity issues limits its use. Polychaete aquaculture has become the best alternative to wild resources. In this study, two different culture techniques (1-sediment tank throughout the culture period and 2-nursery tank with bioflocs for 30 days; thereafter, juveniles were transferred to sediment tank until harvest) using two diets [bioflocs (BF) and feed mill sweepings (FS)] were tested to determine the survival, growth and biomass of polychaete Marphysa iloiloensis (Glasby et al., Zootaxa, 2019, 4674) in the grow-out.The 180-day trial was conducted in 16 tanks (0.20 m 2 ) stocked with 5,066 ± 575 M. iloiloensis trochophore larvae/tank which were assigned randomly into four culture treatments with four replicates each. The treatments were labelled as: (a) BFS -fed BF in sediment tank for 180 days; (b) BF + BFS -fed BF in nursery tank for 30 days, juveniles were transferred in sediment tank and fed BF for another 150 days; (c) FSS -fed FS in sediment tank for 180 days; and (d) BF + FSS -fed BF in nursery tank for 30 days, juveniles are transferred in sediment tank and fed FS for another 150 days. Results showed that polychaetes in BF + FSS had significantly higher survival than BFS. Polychaetes in both BF + FSS and FSS had significantly higher body weight than BF + BFS and BFS, while biomass in BF + FSS (175.73 ± 42.25 g/tank) was significantly higher compared to other treatments (p < .05). Polychaetes fed with FS had 61%-64% protein and 12%-13% fat, while those fed with BF exclusively had 66%-70% protein and 3.50%-4.50% fat. The findings indicate that FS whether or not BF is included in the diet can improve both survival and growth of polychaetes but significantly higher biomass can be achieved with the combination of BF and FS.Additionally, polychaetes in BF + FSS contained 64% protein and 13% fat. Therefore, BF can be used as an alternative diet to FS in the early life stages of M. iloiloensis and nursery rearing using BF is imperative to increase its biomass in the grow-out production. K E Y W O R D Sbiofloc, marine annelid, Marphysa iloiloensis, mudworm, polychaete culture

show abstract

Manipulating the timing of maturation and competence for fertilization and development of oocytes from the semelparous polychaeteNereis(Neanthes)virensSars

Cited by 3 publications

References 5 publications

Impact of pH on oocyte fertilisation and the overrun of meiotic checkpoints leading to parthenogenetic development inNereis virens

Impact of pH on oocyte fertilisation and the overrun of meiotic checkpoints leading to parthenogenetic development inNereis virens

Pre-emptive competition as a selective pressure for early reproduction in the polychaete Nereis virens

Survival, growth and biomass of mud polychaete Marphysa iloiloensis (Annelida: Eunicidae) under different culture techniques

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