Egg cannibalism in Acartia tonsa: effects of stocking density, algal concentration, and egg availability

Drillet, Guillaume; Maguet, Rémi; Mahjoub, Mohamed-Sofiane; Roullier, François; Fielding, Mark James

doi:10.1007/s10499-013-9747-1

Cited by 20 publications

(15 citation statements)

References 40 publications

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“…In the range of density, where adults were not food limited there is a negative correlation between the egg harvest and the number of adults confirming that increasing the copepod stocking density does affects negatively the egg harvest. This can be explained partly by egg cannibalism which is known to occur in copepods (Daan, Gonzalez & Breteler ; Uye & Liang ; Camus & Zeng ) including in A. tonsa (Lonsdale, Heinle & Siegfried ; Drillet, Maguet, Mahjoub, Roullier & Fielding ). The latter study (Drillet et al .…”

Section: Discussionmentioning

confidence: 99%

“…The latter study (Drillet et al . ) showed that under certain conditions optimal for cannibalism (high starved adult and egg density, 3 h incubations) a single adult A. tonsa could ingest up to 20 eggs h −1 . Considering that eggs sediment in the chambers to reach the harvesting mesh (Fig ), there must be a trade‐off between the depth of the chamber, the flow through the chamber and the density of adults in the culture (Drillet & Lombard ) and therefore it has been argued that continuous egg harvest (or separation from adults) is necessary to improve egg harvest yield per adult (Drillet, Frouël et al .…”

Section: Discussionmentioning

confidence: 99%

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Total egg harvest by the calanoid copepodAcartia tonsa(Dana) in intensive culture - effects of high stocking densities on daily egg harvest and egg quality

et al. 2014

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Understanding the factors limiting copepod productivity in dense cultures is a prerequisite for the partial or entire replacement of Artemia and rotifers as live feed for finfish larvae. In dense cultures, high encounter rates between individuals may increase stress, cannibalism incidents and potentially trigger resting egg production.We conducted an experiment to evaluate the potential egg production and egg quality of Acartia tonsa stocked at densities ranging from 10 to >5000 ind. L À1 . Egg Production (EP), Delayed Hatching Eggs production (DHE), hatching success (HS), egg mortality and water quality were used as end points. In the present system, A. tonsa was raised at >5000 ind. L À1 without affecting the mortality, confirming that attaining this high density in culture is possible. However, egg harvest reached an optimum of 12 000 egg L À1 day À1 at~2500 ind. L À1 indicating that increasing stocking density above this level is not of practical interest. Calculations showed that the loss in egg harvest at stocking densities <2500 ind. L À1 is of 1.3% for every additional 100 adult copepods L À1 . The increasing adult density did not affected the proportion of DHE produced (~10% of harvest) but decreased significantly the HS, though not to a point that would be problematic in a commercial production.Understanding the biology of copepods when stocked at high density is important to improve copepod culture systems and increase egg harvest yields. Technical solutions such as the continuous separation of eggs from adults in the water column, recirculation and the continuous provision of food are seen as potential solutions.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Total egg harvest by the calanoid copepodAcartia tonsa(Dana) in intensive culture - effects of high stocking densities on daily egg harvest and egg quality

et al. 2014

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“…In turn, if higher amounts of food are added, this may affect water quality negatively because of unused nutrients as well as exudates (Drillet et al., ), and consequently, water exchange has to be increased. Finally, though it was not controlled in our experiments, it is possible that at higher temperatures if enhanced encountering of eggs and offspring occurs as well as competition for food and mates, cannibalism may occur (Camus & Zeng, ; Drillet et al., ).…”

Section: Resultsmentioning

confidence: 98%

“…A. grani is a copepod with low capacity to dampen food variability (Calbet & Alcaraz, ), and it is well known that the growth rate depends on food availability (Herrera, Yebra & Hernández‐Léon, ). If increased water temperatures induce faster development and growth, higher densities will be found in the culturing tanks, leading to higher competition for space and food (Støttrup, Richardson, Kirkegaard & Pihl, ; Drillet, Maguet, Mahjoub, Roullier & Fielding, ). In turn, if higher amounts of food are added, this may affect water quality negatively because of unused nutrients as well as exudates (Drillet et al., ), and consequently, water exchange has to be increased.…”

Section: Resultsmentioning

confidence: 99%

The effects of temperature and photoperiod on egg hatching success, egg production and population growth of the calanoid copepod, Acartia grani (Calanoida: Acartiidae)

Nogueira¹,

Sumares²,

Andrade

et al. 2017

Aquac Res

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Calanoid copepods, including species of the genus Acartia, are commonly used as larval diets for marine finfish. This study aimed to determine the separate effects of water temperature (18, 22, 24, 28°AE 0.5°C) and photoperiod (24L:0D; 18L:6D; 12L:12D; 8L:18D; 0L:24D) on Acartia grani egg production (EP), hatching rate (EHR) and population growth. Egg production rate was not affected by the two abiotic parameters. A. grani eggs incubated at T24°C and T28°C were the first to achieve 50% hatching rate (23-25 hr), with significant differences at the end of the experiment (48 hr) between T28°C treatment (EHR 88 AE 5%) and T18°C treatment (EHR 65 AE 2%). However, different temperature regimes did not affect final number of individuals in population growth experiment. Still, when eggs were excluded from data, population at lower temperatures (18°C) was mainly composed by the nauplii stage (72%), while at higher temperatures (24°C and 28°C) more than 60% of the population was composed by copepodites and adults. A. grani subjected to long-day photoperiods had significantly lower EHR (16.7% at 24L:0D; 20.8% at 18L:6D) than at short-day photoperiods (52.6% at 6L:18D; 50.0% at 0L:24D). In population growth experiment, eggs were the most common life stage after 12-day culture.Lowest population number was found at constant light conditions (665.0 AE 197.1), suggesting higher metabolic rates and depletion of energy reserves in long-day conditions. This study expanded knowledge on the biological response of A. grani to separate temperature and photoperiod regimes, and provided ground to improve the culture of this potential life feed species for hatcheries. K E Y W O R D S

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“…In a R setup, densities of A. tonsa reached densities >5000 ind./L for several generations (Drillet, Goetze, Jepsen, Højgaard, & Hansen, 2008). Based on a model approach, Drillet and Lombard (2015) (Steenfeldt, 2008;Støttrup, 2003 (Drillet, Maguet, et al, 2014;Lazzaretto & Salvato, 1992).…”

Section: Population Growthmentioning

confidence: 99%

Interactions between populations of the calanoid copepodAcartia tonsaDana and the harpacticoid copepodTisbe holothuriaeHumes in mixed cultures of live feed for fish larvae

et al. 2017

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Copepods are considered high quality live feed for fish larvae due to their large within species size span, swimming pattern triggering hunting behaviour, and complete biochemical profile. In a continuous cultivation system aiming at the planktonic calanoid Acartia tonsa an intruding harpacticoid frequently appears. We experimentally evaluate how the interaction from the semi-benthic Tisbe holothuriae is affecting our cultures and ask whether the two copepod-species are expected to pose competitive exclusion or co-exist long-term. This is pursued by establishing 40 days mono-and mixed copepod cultures reared in a stationary setup (S) theoretically advantageous for T. holothuriae and a rotating setup (R) with organisms kept in suspension by use of a plankton wheel, theoretically advantageous for A. tonsa. The carrying capacities of A. tonsa in either mono-or mixed cultures are not affected whether the copepods are subject to S or R treatment. Only exception is the S-setup containing mixed culture were A. tonsa obtains a significantly lower carrying capacity compared with A. tonsa alone in R-setup. The mono-and mixed cultures of T. holothuriae are, however, highly negatively affected by the R setup compared with S setup. A long-term solution to limit the presence of T. holothuriae is to apply turbulence level in a classical stagnant tank setup to an extend that suppress T. holothuriae and simultaneously allow algae in suspension as food for A. tonsa, make their eggs sediment as well as minimize risk of benthic-predation on eggs. K E Y W O R D Sco-existence, culture contamination, logistic population development, niche differentiation, polyculture

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Egg cannibalism in Acartia tonsa: effects of stocking density, algal concentration, and egg availability

Cited by 20 publications

References 40 publications

Total egg harvest by the calanoid copepodAcartia tonsa(Dana) in intensive culture - effects of high stocking densities on daily egg harvest and egg quality

Total egg harvest by the calanoid copepodAcartia tonsa(Dana) in intensive culture - effects of high stocking densities on daily egg harvest and egg quality

The effects of temperature and photoperiod on egg hatching success, egg production and population growth of the calanoid copepod, Acartia grani (Calanoida: Acartiidae)

Interactions between populations of the calanoid copepodAcartia tonsaDana and the harpacticoid copepodTisbe holothuriaeHumes in mixed cultures of live feed for fish larvae

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