Roles of microalgae on total egg production over female lifespan and egg incubation time, naupliar and copepodite survival, sex ratio and female life expectancy of the copepod Bestiolina similis

Camus, Thomas, and Zeng, Chaoshu (2010) Roles of microalgae on total egg production over female lifespan and egg incubation time, naupliar and copepodite survival, sex ratio and female life expectancy of the copepod Bestiolina similis. Aquaculture Research, 41 (11). pp. 1717-1726.

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Abstract

We examined the effects of 10 microalgal diets on a range of productivity-related parameters of Bestiolina similis. The diets tested included four monoalgal diets: Tahitian strain Isochrysis sp. (T-Iso), Pavlova salina (Pav), Tetraselmis chuii (Tet) and the diatom Chaetoceros muelleri (Chaet), five binary diets: Tet+Pav, T-Iso+Tet, T-Iso+Pav, Chaet+Tet and Chaet+Pav and a tri-algal diet: T-Iso+Tet+Pav. Except for sex ratio, microalgal diets significantly affected all parameters examined (P<0.05). The shortest egg incubation time was found for the tri-algal diet treatment (1.91±0.04 days) while the longest (2.41±0.09 days) was from the monoalgal diet Tet. Survival at the naupliar stage ranged from the highest of 86.3±1.0% for the tri-algal diet to a complete mortality for the Tet diet. Naupliar survival was consistently higher than that of copepodite stages for all diets examined and ranged from 86.3±1.0% for the tri-algal diet to a complete mortality for the Tet diet. Copepodite survival was the highest for the T-Iso treatment (69.0±4.3%) while Chaet+Tet produced the lowest survival (8.8±1.2%).

Sex ratio of B. similis was strongly skewed towards females. Adult female life expectancy was highly dependent on diet. The shortest lifespan (3.1±0.3 days) of the Tet treatment was only about half of that of Pav (6.3±0.6 days) and the tri-algal diet (5.9±0.4 days). Daily egg production during female lifespan was generally lower on the first day, but peaked over the subsequent days before decreasing towards the end of their lifespan. The highest total egg output over female lifespan was produced by the tri-algal diet (156.0±11.5 eggs female−1), while the lowest output came from the diet Tet (20.7±2.8 eggs female−1).

Item ID: 16694
Item Type: Article (Research - C1)
ISSN: 1365-2109
Keywords: Paracalanid copepod, Bestiolina similis, microalgal diets, daily and total egg production, female lifespan, naupliar and copepodite survival, sex ratio Introduction
Date Deposited: 06 May 2011 02:24
FoR Codes: 07 AGRICULTURAL AND VETERINARY SCIENCES > 0704 Fisheries Sciences > 070401 Aquaculture @ 75%
06 BIOLOGICAL SCIENCES > 0602 Ecology > 060205 Marine and Estuarine Ecology (incl Marine Ichthyology) @ 25%
SEO Codes: 83 ANIMAL PRODUCTION AND ANIMAL PRIMARY PRODUCTS > 8301 Fisheries - Aquaculture > 830101 Aquaculture Crustaceans (excl. Rock Lobster and Prawns) @ 50%
83 ANIMAL PRODUCTION AND ANIMAL PRIMARY PRODUCTS > 8301 Fisheries - Aquaculture > 830199 Fisheries - Aquaculture not elsewhere classified @ 50%
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