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					               GROWTH OF ADULT SEAHORSES Hippocampus guttulatus
               FED EXCLUSIVELY ON ENRICHED ADULT Artemia
               (PROJECT HIPPOCAMPUS)
              M. Planas, P. Quintas & A. Chamorro
                                                                                           Spain,
               Instituto de Investigaciones Marinas (CSIC), Eduardo Cabello 6, 36208 Vigo, Spain, +34 986214457 mplanas@iim.csic.es




INTRODUCTION                                                                                           30
Maintenance of seahorses in captivity is generally dependent on                                                   ♂
supply of Artemia supplemented with mysidaceans. A long-term study
                                      mysidaceans. long-                                                                      Max recorded weight
                                             long-
was carried out on the growth of adult long-snouted seahorses                                          25                                                                                 Weight gain




                                                                                    WET WEIGHT (gr)
(Hippocampus guttulatus) fed exclusively on Artemia. The objective
                guttulatus)                    Artemia.                                                           ♀
was to investigate the adequateness of adult Artemia to support                                                                                                                           ♂   + 11.9 g (92% )
                                                                                                       20
growth (SGR) of seahorses. The results show that adult Artemia is a
satisfactory prey when cultivated and enriched adequately.
                                                                                                       15                                                           non-repr                  ♀   + 7.5 g (70% )
                                                                                                                                                    repr
                                                                                                                                non-repr
MATERIALS AND METHODS                                                                                  10
                                                                                                                  repr
Long-                                        guttulatus,
Long-snouted seahorses, Hippocampus guttulatus, were hand-caughthand-
collected in Galicia (NW Spain) in 2006 and maintained in captivity for
                                                                captivity                                5
                                                                 distributed
two years. The seahorses (16 males and 16 females) were distributed                                                                 Males             Females
in 160 l (85H x 75L x 25D cm) aquaria (Chamorro et al., 2007).                                           0
                                          (Jun-
Photoperiod varied from 16L/8D (Jun-Jul) to 10L/14D (Dec).             (Dec).
Temperature was progressively adjusted (15-20ºC). Further
                                                       (15- 20º                                              0        3      6     9   12    15   18                        21
information is provided by Planas et al. (2008). Seahorses were fed ad                                                    TTIME IN CAPTIVITY (months)
                                                      Inve) (Quintas
libitum twice daily on enriched adult Artemia (EG, Inve) (Quintas et al.,
                                           (15-
2007). Initially, Artemia was grown (15-21 days) on mixtures of
                        Inve)
Isochrysis sp, Prolon (Inve) and Spirulina and enriched for 24-30 h on
                                                                  24-                                         (gr)
                                                                                               Fig. 1. Weight (gr) of seahorses (males and females) maintained in captivity
a mixture of Prolon and Isochrysis. More recently, a long-term
                              Isochrysis.                          long-                       for two seasons.
                                           (Bernaqua)
enrichment (>3 days) with Red Pepper (Bernaqua) was applied during
ongrowing to increase HUFA levels. Seahorses were weighted when
captured and at the end and start of the reproductive season (31 Oct
06, 1 Mar 07, 31 Oct 07 and 1 Mar 08). Specific growth rates (SGR %)(SGR
were calculated for the reproductive (1 Mar - 31 Oct) and non-           non-                         0,6
reproductive (31 Oct - 1 Mar) seasons.                                                                                                                   Reproductive Season
                                                                                                      0,5                                                Non-reproductive Season

                                                                                                      0,4                                MALES
RESULTS AND DISCUSSION
                                                                                                                                                      y = -0.3521 Ln(x) + 1.1339
Seahorse Mean weight (mean± sd) of caught seahorses was 10.8 ± 3.6
                        (mean± sd)                                                                    0,3
                                                                                    SGR (%)




                                                                                                                                                                2
g (3.3 – 17.1 g) in females and 12.9 ± 3.0 g (6.4 – 18.7 g) in males.                                            FEMALES                                     R = 0.8047
                                                                28.9
Maximal weight achieved in captivity was 23.7 g in females and 28.9 g
                                                                                                      0,2
                                                             increase)
in males. Weight gain in 21 months was 11.9 g in males (92% increase)
                                                                                                                                                                     y = -0.3163 Ln(x) + 1.0023
and 7.5 g in females (70% increase). Specific growth rates (SGR %)                                                                                                               2
were high and, consistently higher in males than in females,                                          0,1                                                                   R = 0.4407

decreasing progressively as weight increased and dropping to 0
(growth stopped) when males and females reached about 25 and 20 g,                                    0,0              y = -0.2726 Ln(x) + 0.8022
                                                                                                                                2
respectively (Fig 2). Growth of seahorses in our study was near to                                                             R = 0.6745
                                                             about 6-
those reported by Palma et al. (2008) in seahorses weighting about 6-8                                -0,1
g and fed on frozen shrimp (SGR=0.53) and mysids (0.48). Those                                                                                      y = -0.2832 Ln(x) + 0.8413
                                                                                                                                                            2
authors also reported no growth when seahorses were fed on adult                                                                                           R = 0.6211
frozen Artemia (-0.01).                                                                               -0,2
                                                                                                             0            5              10    15       20                           25            30
                                                     long-
The study demonstrates that growth in adults of the long-snouted
                                                                                                                                          WET WEIGHT (gr)
seahorse Hippocampus guttulatus is plenty satisfactory when fed
                               Artemia.
exclusively on adult enriched Artemia. The culture and enrichment
                                                                                                                                                       females)
                                                                                         Fig. 2. Specific growth rates (SGR %) in seahorses (males and females)
procedures applied to Artemia seem to be adequate.
                                                                                         maintained in captivity for two seasons.



ACKNOWLEDGEMENTS
                                                                      Science           (CGL2005- 05927- C03-
Project Hippocampus was financed by the Spanish Ministry of Science and Technology (CGL2005-05927-C03-01/03) and Xunta de Galicia
                                                                            (JAE-
(PGIDIT06PXIC402106PN). P. Quintas was supported by a postdoctoral contract (JAE-CSIC).



REFERENCES
              Stockdale,                  J.P.                                                                                  guttulatus)            diets.
Palma, J., J. Stockdale, M. Correia and J.P. Andrade 2008. Growth and survival of adult long snout seahorse (Hippocampus guttulatus) using frozen diets.
Aquaculture,      55-
Aquaculture, 278: 55-59.
                                                                                                           long-         seahorse,
Planas, M., A. Chamorro, P. Quintas and A. Vilar 2008. Establishment and maintenance of threatened long-snouted seahorse, Hippocampus guttulatus,guttulatus,
               captivity. Aquaculture,     18-
broodstock in captivity. Aquaculture, 283: 18-28.
                              Piñ                                     Producció                     alimentació
Quintas, P., A. Chamorro, S. Piñeiro, I. Medina, and M. Planas. 2007. Producción de Artemia para la alimentación del caballito de mar Hippocampus guttulatus
                                                                      Spain, 555-
Cuvier 1829 en cautividad. XI Congreso Nacional de Acuicultura, Vigo, Spain, 555-558.



                                                      WORLD AQUACULTURE 2009    VERACRUZ (MEXICO)                     MAY 25 - 29 2009

				
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