Culture of yellowtail kingfish (Seriola lalandi ) in RAS
A. Blanco, K. Kloet, M. Poelman, O. Schneider, H. v.d. Mheen and W. Abbink
Conclusions
First trials show high potential for farming of yellowtail kingfish (Seriola lalandi ) in RAS for (Dutch) aquaculture.
Husbandry conditions for temperature, water pH and oxygen concentration were established.
Commercial grow<out to 3 < 4 kg was successful and product quality was high (taste panel).
B o d y m ass (g )
1000
Growth of the fish during the first trials
750
500
250
FCR: 0.7
FCR: 1.0
0
0
50
100
Days
150
Introduction
70
initial bo dy mass
final body mass
C
60
An inventory was done on culture and reproduction potential and market
perspectives for new species for Dutch recirculation aquaculture systems (RAS).
Yellowtail kingfish was identified as prime species.
Objective: to optimise ongrowing conditions for this species in RAS.
B
B
50
body mass (g)
A
A
40
30
20
10
0
21°C
Material and methods
FCR:
23.5°C
1.17
1.16
25°C
26.5°C
1.01
29°C
0.91
1.02
200
In RAS, a range of five water temperatures (21 – 29°C) and 3 pH values
B
initial body mass
180
A
final bo dy mass
160
(6.5 – 7 – 8) were investigated for a period of four weeks.
A
Three 800 l tanks were used per experimental group.
Performance (body mass, FCR, SGR) and physiological parameters
body mass(g)
140
120
100
80
60
(glucose, lactate, osmolality, plasma pH) were analysed.
40
20
In addition, trials in a commercial setting (~60 Kg/m³) were performed.
0
pH 6.5
FCR:
Results and perspectives
1.15
pH 7
pH 8
0.98
0.99
Growth of the fish at different temperatures and pH values
Physiological data indicate that the fish are not
stressed and have a high energy metabolism.
Group:
21°C
23.5°C
25°C
26.5°C
29°C
pH 6.5
pH 7
pH 8
Glucose
6.2±0.7 b
7.2±1.1 c
7.6±0.7 ac
8.1±0.3 a
8.1±0.5a
8.5±0.5b
7.8±1.0 ab
7.3±1.4 a
Trials in a commercial setting revealed adequate
Lactate
6.9±1.5 bc
7.9±1.0 ac
8.5±1.4 a
8.7±1.5 a
7.7±1.4a c
8.4±2.5a
10.8±1.4b
9.8±1.2 ab
Osmolality
385±11 b
390±8ab
394±11 a
398±6a
392±10a b
409±10b
402±4 a
397±9a
performance during ongrowing.
pH
7.56±0.03
7.58±0.05
7.61±0.07
7.61±0.07
7.58±0.07
7.40±0.09 b
7.48±0.04 a
7.48±0.04a
Study with specific diets (different fish meal contents) planned.
IMARES,
P.O. Box 77, 4400 AB Yerseke, The Netherlands
Tel. +31 317 480 900
Fax +31 317 487 326
e<mail: imares@wur.nl
www.imares.wur.nl
Ainhoa Blanco; ainhoa.blanco@wur.nl
Physiological parameters at different temperatures and pH values
Osmolality is expressed in mOsmol/kg, glucose and lactate in mmol/l