Applying algal paste as food for copepod live feed—A growth study on Acartia tonsa nauplii using the microalga Isochrysis galbana

2018 ◽  
Vol 50 (2) ◽  
pp. 694-697
Author(s):  
Thomas A. Rayner ◽  
Benni W. Hansen
Keyword(s):  
Isochrysis Galbana ◽  
Acartia Tonsa ◽  
Growth Study ◽  
Live Feed

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

Aquaculture ◽  
2015 ◽  
Vol 436 ◽  
pp. 114-120 ◽  
Author(s):  
Stian Halsen Hammervold ◽  
Ronnie N. Glud ◽  
Jan Ove Evjemo ◽  
Andreas Hagemann ◽  
Benni Winding Hansen
Keyword(s):  
Selective Breeding ◽  
Calanoid Copepod ◽  
Acartia Tonsa ◽  
Live Feed

Recommended feeding regime and light climate in live feed cultures of the calanoid copepod Acartia tonsa Dana

2016 ◽  
Vol 25 (2) ◽  
pp. 635-654 ◽  
Author(s):  
Per M. Jepsen ◽  
Niels S. Bjørbæk ◽  
Thomas A. Rayner ◽  
Minh T. T. Vu ◽  
Benni W. Hansen
Keyword(s):  
Calanoid Copepod ◽  
Acartia Tonsa ◽  
Light Climate ◽  
Feeding Regime ◽  
Live Feed

scholarly journals The copepod Acartia tonsa as live feed for fat snook (Centropomus parallelus) larvae from notochord flexion to advanced metamorphosis

2017 ◽  
Vol 45 (1) ◽  
pp. 159-166 ◽  
Author(s):  
Marcia Vanacor Barroso ◽  
Cristina Vaz Avelar de Carvalho ◽  
Rosemar Antoniassi ◽  
Vinicius Ronzani Cerqueira
Keyword(s):  
Acartia Tonsa ◽  
Live Feed ◽  
Fat Snook

scholarly journals Diet influence on egg production of the copepod Acartia tonsa (Dana, 1896)

2010 ◽  
Vol 82 (2) ◽  
pp. 333-339 ◽  
Author(s):  
Priscila F. Teixeira ◽  
Sonia M. Kaminski ◽  
Tatiana R. Avila ◽  
Alessandro P. Cardozo ◽  
José G.F. Bersano ◽  
...  
Keyword(s):  
Egg Production ◽  
Isochrysis Galbana ◽  
Threshold Value ◽  
Acartia Tonsa ◽  
Thalassiosira Weissflogii ◽  
Chaetoceros Muelleri ◽  
Experimental Conditions ◽  
Male And Female ◽  
Experimental Medium ◽  
Controlled Conditions

Egg production in the copepod Acartia tonsa was evaluated using different densities of the microalgae Thalassiosira weissflogii, Chaetoceros muelleri and Isochrysis galbana. Male and female were kept under controlled conditions (salinity 30, 20°C, photoperiod 12L:12D), acclimated to the experimental conditions and left over a period of 24 h to allow copulation. Algal densities tested were equivalent in biovolume and corresponded to 0, 2.5, 5, 10, 20, 40 and 60.10³ cells.mL-1 of T weissflogii. Ten acclimated female were separated, transferred to glass bottles and exposed for further 24 h to the corresponding experimental medium. After this period, the eggs were fixed and counted. Copepod egg production reached a threshold value when T weissflogii, C. muelleri and I. galbana were supplied at 10.10³, 140.10³ and 640.10³ cells.mL-1, respectively. Mean egg production corresponded to 28.0 ± 0.5, 20.1 ± 1.0 and 22.0 ± 3.5 eggs.female-1 .day-1, respectively. Copepods fed T weissflogii showed the highest mean egg production while those fed I. galbana reached a maximum egg production when the algae were supplied at a density two- to fourfold higher, considering the biovolume of T weissflogii and C. muelleri. These differences are explained considering the different sizes of the microalgae used to feed the copepods.

scholarly journals Effects of Epibiotic Diatoms on the Productivity of the Calanoid Copepod Acartia tonsa (Dana) in Intensive Aquaculture Systems

2021 ◽  
Vol 8 ◽  
Author(s):  
Yen-Ju Pan ◽  
Wei-Lung Wang ◽  
Jiang-Shiou Hwang ◽  
Sami Souissi
Keyword(s):  
Egg Production ◽  
Calanoid Copepod ◽  
Acartia Tonsa ◽  
Infestation Rate ◽  
High Density Culture ◽  
Harvest Rate ◽  
Live Feed ◽  
Infestation Intensity ◽  
The Individual ◽  
Intensive Aquaculture

We evaluated here the effects of the epibiotic diatom Tabularia sp. on the productivity of the calanoid copepod Acartia tonsa (Dana) for assessing their risk on copepod intensive aquaculture industry for the provision of live feed. In the first experiment, uninfested and intensively infested females were cultivated individually for the assessment of egg production. Intensively infested females appeared to have a significantly lower egg production (5.0–9.0 eggs/female/d) than uninfested females (22.0–26.0 eggs/female/d) during 5 consecutive days. In the second experiment, effects of culture densities on diatom epibiosis were investigated in 9 L cultures at three different densities (200, 400, and 600 ind. L–1). Another culture at higher volume (250 L) and lowest density (200 ind. L–1) was also carried out to test the effect of culture volume on diatom epibiosis. The infestation rate (%), infestation intensity (ratio of surface diatom coverage levels, classified as levels 0–3) and daily egg harvest rate (number of harvested eggs per day per liter) were evaluated among the four culture populations. The copepods had higher infestation rate (53.69–60.14%) and intensity rate (high ratios at level 2 and 3) when the densities were increased from 200 ind./L to 400 and 600 ind./L. Although egg harvest increased with increasing culture density, it seemed that the diatom-infested A. tonsa population reach a saturated egg production when the density was higher than 400 ind./L. Nevertheless, the differences of culture volumes (250 and 9 L) appeared to be not to have any effect when the copepods were cultivated at the same density (200 ind./L). This study reveals for the first time that the epibiosis of the diatom Tabularia sp. reduces the individual egg production, and egg harvest rate in high-density culture of the copepod A. tonsa. Our findings implicate that diatom epibiosis should be avoid in copepod intensive culture systems.

Some comparative aspects of a longitudinal growth study in normal spanish children and other longitudinal studies

1986 ◽  
Vol 113 (4_Suppl) ◽  
pp. S93-S97 ◽  
Author(s):  
A. FERRANDEZ ◽  
E. MAYAYO ◽  
M. RODRIGUEZ ◽  
J.M. ARNAL ◽  
J. CARO ◽  
...  
Keyword(s):  
Longitudinal Studies ◽  
Environmental Conditions ◽  
Regional Differences ◽  
Longitudinal Growth ◽  
Growth Study ◽  
Growth Studies ◽  
Different Populations ◽  
Catch Up

Abstract The differences existing among some european longitudinal growth studies make it necessary to be cautious in the use of standards constructed on different populations. The improvement of the environmental conditions during the last 20 years is probably the most important cause of the "catch-up" phenomenon of the spanish stature. It is probable that racial characteristics also play a role, even in the same country as can be appreciated on comparing two spanish longitudinal studies based on children originary from different regions. All of wich indicates the need to use own standards in those countries wich, like ours, have lived through a period of intenses changes. Even exploratory studies of regional differences in the same country seem necesary.

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