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

Helgoländer Meeresuntersuchungen volume 45, pages 345–356 (1991)Cite this article

Abstract

The harpacticoid copepodTisbe holothuriae 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 seaweedUlva; five artificial compound feeds: the liquid Fryfood® (Waterlife), a powder ofMytilus, yeast, soya andSpirulina, respectively; and a mixed diet consisting ofUlva 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 ofT. 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 oft. holothuriae, resulting in an efficient intrinsic rate of natural increase (rm=0.304) of the population.

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  1. Zoological Laboratory, University of Athens, 15771, Athens, Greece

    H. Miliou & M. Moraïtou-Apostolopoulou

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  1. H. Miliou
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  2. M. Moraïtou-Apostolopoulou
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Miliou, H., Moraïtou-Apostolopoulou, M. Effects of seven diets on the population dynamics of laboratory culturedTisbe holothuriae Humes (Copepoda, Harpacticoida). Helgolander Meeresunters 45, 345–356 (1991). https://doi.org/10.1007/BF02365524

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Helgoland Marine Research

ISSN: 1438-3888

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