A new large egg type from the marine live feed calanoid copepo Acartia tonsa (Dana) - Perspectives for selective breeding of designer feed for hatcheries

Stian Halsen Hammervold, Ronnie N. Glud, Jan Ove Evjemo, Andreas Hagemann, Benni Winding Hansen

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

Resumé

Mass cultivation of marine copepods as live feed requires predictable and uniform production of a standard product for the end users, the hatcheries. A previously undescribed large egg type, measuring a mean diameter of 106.5 μm, was characterized and compared to normal eggs (82.3 μm) from a continuous culture of Acartia tonsa. The large egg type was significantly larger than the normal eggs, and only 1 large out of approximately 100 000 normal-sized eggs was found. Mean egg densities was 1.34 ± 0.16 g/cm3 and 1.20 ± 0.07 g/cm3 for normal and large eggs, respectively. The hypothesis that large eggs were dormant, as indicated from the relatively low hatching success of 60%, within 48 h, was rejected as no significant difference was found in egg volume-specific respiration rates or histological analysis of the chorion between the two egg types. The nauplii hatched from large eggs were correspondingly large, and the copepods remained large when developing into adulthood. The fact that copepods hatched from large eggs were fertile indicates no chromosomal abnormalities and suggests that this egg type represents the upper tail end of eggs in a classical normal distribution of size vs. frequency. The next generations' eggs were not as large as the ones they originated from suggesting that the rare large eggs represent a maternal effect. The large size eggs do however pose an interesting selection potential for designing large species-specific live feed products in aquaculture
OriginalsprogEngelsk
TidsskriftAquaculture
Vol/bind436
Sider (fra-til)114-120
ISSN0044-8486
DOI
StatusUdgivet - 2015

Citer dette

@article{8bdff206a98245abb2469a04d5af1e93,
title = "A new large egg type from the marine live feed calanoid copepo Acartia tonsa (Dana) - Perspectives for selective breeding of designer feed for hatcheries",
abstract = "Mass cultivation of marine copepods as live feed requires predictable and uniform production of a standard product for the end users, the hatcheries. A previously undescribed large egg type, measuring a mean diameter of 106.5 μm, was characterized and compared to normal eggs (82.3 μm) from a continuous culture of Acartia tonsa. The large egg type was significantly larger than the normal eggs, and only 1 large out of approximately 100 000 normal-sized eggs was found. Mean egg densities was 1.34 ± 0.16 g/cm3 and 1.20 ± 0.07 g/cm3 for normal and large eggs, respectively. The hypothesis that large eggs were dormant, as indicated from the relatively low hatching success of 60{\%}, within 48 h, was rejected as no significant difference was found in egg volume-specific respiration rates or histological analysis of the chorion between the two egg types. The nauplii hatched from large eggs were correspondingly large, and the copepods remained large when developing into adulthood. The fact that copepods hatched from large eggs were fertile indicates no chromosomal abnormalities and suggests that this egg type represents the upper tail end of eggs in a classical normal distribution of size vs. frequency. The next generations' eggs were not as large as the ones they originated from suggesting that the rare large eggs represent a maternal effect. The large size eggs do however pose an interesting selection potential for designing large species-specific live feed products in aquaculture",
author = "{Halsen Hammervold}, Stian and Glud, {Ronnie N.} and Evjemo, {Jan Ove} and Andreas Hagemann and Hansen, {Benni Winding}",
year = "2015",
doi = "10.1016/j.aquaculture.2014.11.003",
language = "English",
volume = "436",
pages = "114--120",
journal = "Aquaculture",
issn = "0044-8486",
publisher = "Elsevier BV",

}

A new large egg type from the marine live feed calanoid copepo Acartia tonsa (Dana) - Perspectives for selective breeding of designer feed for hatcheries. / Halsen Hammervold, Stian; Glud, Ronnie N.; Evjemo, Jan Ove; Hagemann, Andreas; Hansen, Benni Winding.

I: Aquaculture, Bind 436, 2015, s. 114-120.

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

TY - JOUR

T1 - A new large egg type from the marine live feed calanoid copepo Acartia tonsa (Dana) - Perspectives for selective breeding of designer feed for hatcheries

AU - Halsen Hammervold, Stian

AU - Glud, Ronnie N.

AU - Evjemo, Jan Ove

AU - Hagemann, Andreas

AU - Hansen, Benni Winding

PY - 2015

Y1 - 2015

N2 - Mass cultivation of marine copepods as live feed requires predictable and uniform production of a standard product for the end users, the hatcheries. A previously undescribed large egg type, measuring a mean diameter of 106.5 μm, was characterized and compared to normal eggs (82.3 μm) from a continuous culture of Acartia tonsa. The large egg type was significantly larger than the normal eggs, and only 1 large out of approximately 100 000 normal-sized eggs was found. Mean egg densities was 1.34 ± 0.16 g/cm3 and 1.20 ± 0.07 g/cm3 for normal and large eggs, respectively. The hypothesis that large eggs were dormant, as indicated from the relatively low hatching success of 60%, within 48 h, was rejected as no significant difference was found in egg volume-specific respiration rates or histological analysis of the chorion between the two egg types. The nauplii hatched from large eggs were correspondingly large, and the copepods remained large when developing into adulthood. The fact that copepods hatched from large eggs were fertile indicates no chromosomal abnormalities and suggests that this egg type represents the upper tail end of eggs in a classical normal distribution of size vs. frequency. The next generations' eggs were not as large as the ones they originated from suggesting that the rare large eggs represent a maternal effect. The large size eggs do however pose an interesting selection potential for designing large species-specific live feed products in aquaculture

AB - Mass cultivation of marine copepods as live feed requires predictable and uniform production of a standard product for the end users, the hatcheries. A previously undescribed large egg type, measuring a mean diameter of 106.5 μm, was characterized and compared to normal eggs (82.3 μm) from a continuous culture of Acartia tonsa. The large egg type was significantly larger than the normal eggs, and only 1 large out of approximately 100 000 normal-sized eggs was found. Mean egg densities was 1.34 ± 0.16 g/cm3 and 1.20 ± 0.07 g/cm3 for normal and large eggs, respectively. The hypothesis that large eggs were dormant, as indicated from the relatively low hatching success of 60%, within 48 h, was rejected as no significant difference was found in egg volume-specific respiration rates or histological analysis of the chorion between the two egg types. The nauplii hatched from large eggs were correspondingly large, and the copepods remained large when developing into adulthood. The fact that copepods hatched from large eggs were fertile indicates no chromosomal abnormalities and suggests that this egg type represents the upper tail end of eggs in a classical normal distribution of size vs. frequency. The next generations' eggs were not as large as the ones they originated from suggesting that the rare large eggs represent a maternal effect. The large size eggs do however pose an interesting selection potential for designing large species-specific live feed products in aquaculture

U2 - 10.1016/j.aquaculture.2014.11.003

DO - 10.1016/j.aquaculture.2014.11.003

M3 - Journal article

VL - 436

SP - 114

EP - 120

JO - Aquaculture

JF - Aquaculture

SN - 0044-8486

ER -