Dynamique des populations de Tisbe holothuriae (Crustacea: Copepoda) en �levage sur trois r�gimes artificiels diff�rents

Gaudy, R.; Guérin, Jean-Pierre

doi:10.1007/bf00386999

Cited by 31 publications

(9 citation statements)

References 10 publications

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“…For Spirulina, negative values of rm (-0.048) have been noted. The rm values obtained under optimal trophic conditions for the Greek population of Tisbe holothuriae are considered satisfactory, compared with the maximum rm: 0.301 (Aliment Bioter) and 0.313 (Renutryl), found by Gaudy & Gu~rin (1977) and Gaudy et aL (1982), respectively, for the French population of Tisbe holothuriae, under the same temperature/salinity conditions. The productivity of Tisbe populations is directly correlated with the following life cycle parameters: (a) survival during development, (b)sex ratio, (c) number of egg sacs per female, (d) number of offspring per egg sac, (e) development rate.…”

Section: Discussionmentioning

confidence: 75%

“…All life cycle parameters were affected to a greater or lesser degree by the type of food offered. Gaudy & Gu~rin (1977), feeding Tisbe with the two diets Germalyne and Renutryl, found also significant variations in population measurements dependent on diet.…”

Section: Discussionmentioning

confidence: 90%

“…Gu~rin & Gaudy (1977) suggest that Tisbe holothuriae displays a higher productivity and lipid content when fed on compound artificial diets of animal substances than when fed on diets of vegetarian origin or on living unicellular algae. Gopalan (1977) also mentioned that the cultures of the harpacticoid copepod Nitocra spinipes Boek displayed higher productivity when fed on shrimp head meal than on live Chlorella.…”

Section: Discussionmentioning

confidence: 98%

“…Tisbe is known to demonstrate an opportunistic feeding behaviour, utilizing various sources of food such as bacteria, uniceUular algae, detritus, vegetables (Battaglia, 1970;Gaudy & Gu~rin, 1977;Rieper, 1978). However, the study of the influence of diet on the population dynamics of Tisbe has proved that food is an important factor in the regulation of the productivity of Tisbe populations.…”

Section: Discussionmentioning

confidence: 99%

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Effects of seven diets on the population dynamics of laboratory culturedTisbe holothuriae Humes (Copepoda, Harpacticoida)

Miliou

Moraïtou-Apostolopoulou

1991

Helgolander Meeresunters

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The harpacticoid copepod Tisbe holothu~ae was collected from Saronicos Gulf (Greece) and reared under constant laboratory conditions. In order to study the effects of food on the population dynamics, seven diets were tested', the seaweed Ulva; five artificial compound feeds: the liquid Fryfood | (Waterlife), a powder of Mytilus, yeast, soya and Spirulina, respectively; and a mixed diet consisting of Ulva and Fryfood. The life cycle parameters (mortality, sex ratio, generation time, offspring production) were measured, and the demographic variables (mean generation time (T), net reproductive rate (Ro), and intrinsic rate of natural increase (rm)] were determined. As to their efficiency regarding population dynamics, the diets ranked as follows: (1) Ulva + Fryfood, (2), Ulva, (3) Fryfood, (4) Mytilus, (5) soya, (6) yeast, and (7) Spirulina. In this order they cause a progressive increase of both larval mortality and generation time, a progressive decrease of sex ratio, number of offspring per egg sac, number of egg sacs per female and, consequently, of Ro and rm. The observed differences between diets were most pronounced with respect to offspring production. Of the compound diets, those containing animal extracts were more efficient than those containing vegetable materials. Ulva plays an important role in the nutrition of T. holothuriae, favouring offspring production as well as larval survival, development and pigmentation. Ulva in combination with Fryfood led to a greater copepodid survival and offspring production. This mixed diet proved to be the most favourable for rearing the Greek population of T. holothuriae, resulting in an efficient intrinsic rate of natural increase (rm ---0.304) of the population.

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Section: Discussionmentioning

confidence: 75%

Section: Discussionmentioning

confidence: 90%

Section: Discussionmentioning

confidence: 98%

Section: Discussionmentioning

confidence: 99%

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Effects of seven diets on the population dynamics of laboratory culturedTisbe holothuriae Humes (Copepoda, Harpacticoida)

Miliou

Moraïtou-Apostolopoulou

1991

Helgolander Meeresunters

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“…Hence, these experiments preceded the recent publications on population dynamics and ecology in various copepod groups (Gaudy and Guerin, 1977;Corkett and McLaren, 1978;Parrish and Wilson, 1978;Zurlini et al, 1978). These papers and some earlier ones will therefore b e considered together with the results under 'Discussion' of this study.…”

Section: Introductionmentioning

confidence: 72%

Mechanisms of Density-Dependent Population Regulation in the Marine Copepod Amphiascoides sp. (Harpacticoida)

Walker¹

1979

Mar. Ecol. Prog. Ser.

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Amphiascoides sp. was cultured in the laboratory for the first time. Culture method and data on its life cycle are given. Reproductive potential and behaviour (pairing incidence) were studied in relation to population density (i.e. to medium conditioned by a previously dense population) and in relation to food supply. It was found that: (1) conditioned medium reduces the number of ovisacs per female by reducing its fertile period and by extending the interval between release of successive pairs of ovisacs, older females being more susceptible to this inhibition; (2) conditioned medium causes partial sterilization (nonfertilization?) of eggs; (3) these effects are partly, but not completely, reversible when females are returned to fresh medium (delayed, density-dependent effects); (4) crowding itself, but not medium conditioned by crowding, reduces the number of eggs per ovisac; (5) ovisacs are not released in absence of food, and food supply triggers the release of ovisacs; (6) mating incidence is a function of food supply; (7) mating incidence is higher in groups than in isolated pairs; (8) repeated mating is necessary for sustained fertility; (9) infertile periods in females as a result of deprivation of food or males may be compensated for by extension of the normal ( 5 0 4 0 d) fertile period to maximally 80-100 d; (10) the generation period (nauplius to fertile adult) increased by 40 '10 in the course of laboratory existence. These mechanisms of true population regulation via negative feedback are discussed in the light of the 'paradox of evolution under competition': resources are limited, yet, those genotypes that are getting more numerous than others (higher fitness) win the competition (= positive feedback).

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Production and Nutritional Value of Copepods

Støttrup¹

2003

Live Feeds in Marine Aquaculture

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Dynamique des populations de Tisbe holothuriae (Crustacea: Copepoda) en �levage sur trois r�gimes artificiels diff�rents

Cited by 31 publications

References 10 publications

Effects of seven diets on the population dynamics of laboratory culturedTisbe holothuriae Humes (Copepoda, Harpacticoida)

Effects of seven diets on the population dynamics of laboratory culturedTisbe holothuriae Humes (Copepoda, Harpacticoida)

Mechanisms of Density-Dependent Population Regulation in the Marine Copepod Amphiascoides sp. (Harpacticoida)

Production and Nutritional Value of Copepods

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