An analysis of how to improve production of copepods as live feed from tropical Taiwanese outdoor aquaculture ponds

Elisa Blanda, Drillet Guillaume, Cheng-Chien Huang, Jiang-Shiou Hwang, Jacob Kring Højgaard, Hans Henrik Jakobsen, Thomas Allan Rayner, Huei-Meei Su, Benni Winding Hansen

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

Resumé

The motivation for this study was to analyse the productivity of Taiwanese aquaculture ponds while providing recommendations for a more effective copepod harvesting. Hence, variations in copepod species composition, biomass and productivity were investigated during four separate 3 weeks of intensive sampling campaigns across an annual season. The ponds showed seasonal changes, with relatively colder water at 20 °C and lower chlorophyll-a in the winter (January 2014) compared to warm water 32 °C and higher chlorophyll-a during the long summer season (April, July, October 2013). Differences between seasons were found for phytoplankton pigments concentration in the seston. Inorganic nutrients were never limited, and the average availability of phytoplankton such as diatoms and haptophytes was sufficient to support maximal growth of zooplankton. The copepod community was characterized by low species diversity with Pseudodiaptomus annandalei and Apocyclops royi as main species. Adult copepods and copepodite stages showed total maximum biomass in October and January with 383 ± 35 μg C L− 1 and 352 ± 74 μg C L− 1, respectively, where the farmers harvesting effort was minimal. The secondary production, evaluated by the nauplii and copepodites carbon specific growth, was stable at 0.36 ± 0.10 d− 1 and 0.50 ± 0.05 d− 1, respectively. The fatty acid composition in the copepods was highly favourable during the winter campaign of which also coincided with a favourable phytoplankton composition. Lastly, this study shows evidence on the yearlong availability of copepods to the pond managers, which, based on standing stock and secondary productivity, easily could improve and intensify their harvest effort. Nauplii could be harvested all year long and adult copepods and copepodites could also be collected during the winter, allowing the pond managers to expand the sales period and thereby increase their revenue.
OriginalsprogEngelsk
TidsskriftAquaculture
Vol/bind479
Sider (fra-til)432-441
Antal sider10
ISSN0044-8486
DOI
StatusUdgivet - 2017

Citer dette

Blanda, Elisa ; Guillaume, Drillet ; Huang, Cheng-Chien ; Hwang, Jiang-Shiou ; Højgaard, Jacob Kring ; Jakobsen, Hans Henrik ; Rayner, Thomas Allan ; Su, Huei-Meei ; Hansen, Benni Winding. / An analysis of how to improve production of copepods as live feed from tropical Taiwanese outdoor aquaculture ponds. I: Aquaculture. 2017 ; Bind 479. s. 432-441.
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abstract = "The motivation for this study was to analyse the productivity of Taiwanese aquaculture ponds while providing recommendations for a more effective copepod harvesting. Hence, variations in copepod species composition, biomass and productivity were investigated during four separate 3 weeks of intensive sampling campaigns across an annual season. The ponds showed seasonal changes, with relatively colder water at 20 °C and lower chlorophyll-a in the winter (January 2014) compared to warm water 32 °C and higher chlorophyll-a during the long summer season (April, July, October 2013). Differences between seasons were found for phytoplankton pigments concentration in the seston. Inorganic nutrients were never limited, and the average availability of phytoplankton such as diatoms and haptophytes was sufficient to support maximal growth of zooplankton. The copepod community was characterized by low species diversity with Pseudodiaptomus annandalei and Apocyclops royi as main species. Adult copepods and copepodite stages showed total maximum biomass in October and January with 383 ± 35 μg C L− 1 and 352 ± 74 μg C L− 1, respectively, where the farmers harvesting effort was minimal. The secondary production, evaluated by the nauplii and copepodites carbon specific growth, was stable at 0.36 ± 0.10 d− 1 and 0.50 ± 0.05 d− 1, respectively. The fatty acid composition in the copepods was highly favourable during the winter campaign of which also coincided with a favourable phytoplankton composition. Lastly, this study shows evidence on the yearlong availability of copepods to the pond managers, which, based on standing stock and secondary productivity, easily could improve and intensify their harvest effort. Nauplii could be harvested all year long and adult copepods and copepodites could also be collected during the winter, allowing the pond managers to expand the sales period and thereby increase their revenue.",
author = "Elisa Blanda and Drillet Guillaume and Cheng-Chien Huang and Jiang-Shiou Hwang and H{\o}jgaard, {Jacob Kring} and Jakobsen, {Hans Henrik} and Rayner, {Thomas Allan} and Huei-Meei Su and Hansen, {Benni Winding}",
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An analysis of how to improve production of copepods as live feed from tropical Taiwanese outdoor aquaculture ponds. / Blanda, Elisa; Guillaume, Drillet; Huang, Cheng-Chien; Hwang, Jiang-Shiou; Højgaard, Jacob Kring; Jakobsen, Hans Henrik; Rayner, Thomas Allan; Su, Huei-Meei; Hansen, Benni Winding.

I: Aquaculture, Bind 479, 2017, s. 432-441.

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

TY - JOUR

T1 - An analysis of how to improve production of copepods as live feed from tropical Taiwanese outdoor aquaculture ponds

AU - Blanda, Elisa

AU - Guillaume, Drillet

AU - Huang, Cheng-Chien

AU - Hwang, Jiang-Shiou

AU - Højgaard, Jacob Kring

AU - Jakobsen, Hans Henrik

AU - Rayner, Thomas Allan

AU - Su, Huei-Meei

AU - Hansen, Benni Winding

PY - 2017

Y1 - 2017

N2 - The motivation for this study was to analyse the productivity of Taiwanese aquaculture ponds while providing recommendations for a more effective copepod harvesting. Hence, variations in copepod species composition, biomass and productivity were investigated during four separate 3 weeks of intensive sampling campaigns across an annual season. The ponds showed seasonal changes, with relatively colder water at 20 °C and lower chlorophyll-a in the winter (January 2014) compared to warm water 32 °C and higher chlorophyll-a during the long summer season (April, July, October 2013). Differences between seasons were found for phytoplankton pigments concentration in the seston. Inorganic nutrients were never limited, and the average availability of phytoplankton such as diatoms and haptophytes was sufficient to support maximal growth of zooplankton. The copepod community was characterized by low species diversity with Pseudodiaptomus annandalei and Apocyclops royi as main species. Adult copepods and copepodite stages showed total maximum biomass in October and January with 383 ± 35 μg C L− 1 and 352 ± 74 μg C L− 1, respectively, where the farmers harvesting effort was minimal. The secondary production, evaluated by the nauplii and copepodites carbon specific growth, was stable at 0.36 ± 0.10 d− 1 and 0.50 ± 0.05 d− 1, respectively. The fatty acid composition in the copepods was highly favourable during the winter campaign of which also coincided with a favourable phytoplankton composition. Lastly, this study shows evidence on the yearlong availability of copepods to the pond managers, which, based on standing stock and secondary productivity, easily could improve and intensify their harvest effort. Nauplii could be harvested all year long and adult copepods and copepodites could also be collected during the winter, allowing the pond managers to expand the sales period and thereby increase their revenue.

AB - The motivation for this study was to analyse the productivity of Taiwanese aquaculture ponds while providing recommendations for a more effective copepod harvesting. Hence, variations in copepod species composition, biomass and productivity were investigated during four separate 3 weeks of intensive sampling campaigns across an annual season. The ponds showed seasonal changes, with relatively colder water at 20 °C and lower chlorophyll-a in the winter (January 2014) compared to warm water 32 °C and higher chlorophyll-a during the long summer season (April, July, October 2013). Differences between seasons were found for phytoplankton pigments concentration in the seston. Inorganic nutrients were never limited, and the average availability of phytoplankton such as diatoms and haptophytes was sufficient to support maximal growth of zooplankton. The copepod community was characterized by low species diversity with Pseudodiaptomus annandalei and Apocyclops royi as main species. Adult copepods and copepodite stages showed total maximum biomass in October and January with 383 ± 35 μg C L− 1 and 352 ± 74 μg C L− 1, respectively, where the farmers harvesting effort was minimal. The secondary production, evaluated by the nauplii and copepodites carbon specific growth, was stable at 0.36 ± 0.10 d− 1 and 0.50 ± 0.05 d− 1, respectively. The fatty acid composition in the copepods was highly favourable during the winter campaign of which also coincided with a favourable phytoplankton composition. Lastly, this study shows evidence on the yearlong availability of copepods to the pond managers, which, based on standing stock and secondary productivity, easily could improve and intensify their harvest effort. Nauplii could be harvested all year long and adult copepods and copepodites could also be collected during the winter, allowing the pond managers to expand the sales period and thereby increase their revenue.

U2 - 10.1016/j.aquaculture.2017.06.018

DO - 10.1016/j.aquaculture.2017.06.018

M3 - Journal article

VL - 479

SP - 432

EP - 441

JO - Aquaculture

JF - Aquaculture

SN - 0044-8486

ER -