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Reproductive traits and growth of Labrus bergylta in Galician waters
Reproductive traits and growth of Labrus bergylta in Galician waters
Reproductive traits and growth of Labrus bergylta in Galician waters
Reproductive traits and growth of Labrus bergylta in Galician waters
Reproductive traits and growth of Labrus bergylta in Galician waters
Reproductive traits and growth of Labrus bergylta in Galician waters
Reproductive traits and growth of Labrus bergylta in Galician waters
Reproductive traits and growth of Labrus bergylta in Galician waters
Reproductive traits and growth of Labrus bergylta in Galician waters
Reproductive traits and growth of Labrus bergylta in Galician waters
Reproductive traits and growth of Labrus bergylta in Galician waters
Reproductive traits and growth of Labrus bergylta in Galician waters
Reproductive traits and growth of Labrus bergylta in Galician waters
Reproductive traits and growth of Labrus bergylta in Galician waters
Reproductive traits and growth of Labrus bergylta in Galician waters
Reproductive traits and growth of Labrus bergylta in Galician waters
Reproductive traits and growth of Labrus bergylta in Galician waters
Reproductive traits and growth of Labrus bergylta in Galician waters
Reproductive traits and growth of Labrus bergylta in Galician waters
Reproductive traits and growth of Labrus bergylta in Galician waters
Reproductive traits and growth of Labrus bergylta in Galician waters
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Reproductive traits and growth of Labrus bergylta in Galician waters

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  • Fish maturity stages Oocyte stages
  • Cambiar lineas no se ven bien
  • Transcript

    • 1. Reproductive traits and growth of Labrus bergylta in Galician waters David Villegas-Ríos , Alexandre Alonso-Fernandez, Mariña Fabeiro, Rosario Domínguez-Petit and Fran Saborido-Rey
    • 2. INTRODUCTION Galicia and artisanal fishing · 6000 small boats · Multispecific · Different gears (nets, traps, hooklines) · Weak scientific knowledge · Conflict with habitats Landings of Labrus bergylta
    • 3. INTRODUCTION Labrus bergylta (ballan wrasse) · Labridae · Distribution: NE Atlantic and Mediteranean · Inhabits rocky reefs from 0 to 60 m · Feeds on crustacea, molusca, algae and small fish · Very different patterns of coloration
    • 4. INTRODUCTION Reproduction · Protogynic hermaphrodite · Harem forming · Benthic eggs and parental care · Spawns from April to June in Norway Growth · Old studies · Based on opercular bones and scales · 25/29 maximum age for females/males
    • 5. Coloration Non mottled coloration Maragota 3€/kg Mottled coloration Pinto 6€/kg INTRODUCTION
    • 6. METHODS Sampling · Fish markets · 815 individuals from November 2009 to October 2010 · 626 females, 78 males, 107 transitions* · 571 maragota (non mottled coloration), 244 pinto (mottled coloration) · Artisanal fishing: gillnets Fish markets
    • 7. METHODS Sampling Biometry, coloration Reproduction Bioenergetics Diet Growth Formaline -80ºC -20ºC Ovary Ovary Testicles Testicles Liver Muscle Stomach Otolith
    • 8. METHODS Histology · Embebded in parafin · Haematoxilin-eosin · 3 micrometres Primary growth Cortical alveoli Vitellogenesis 1 Vitellogenesis 2 Vitellogenesis 3 Migratory nucleus Hydratation POFs Atresia Brown Peterson et al ., 2011
    • 9. METHODS Growth · Sagittae otoliths · Extracted and washed with freshwater · Reading of the whole otolith submerged in mineral oil · Reflected light · Binocular 3 yr 7 yr 15 yr
    • 10. RESULTS Reproductive cycle in Galicia
    • 11. RESULTS Maturity ogive (length) L 50 =23.3 cm L 50 =23.4 cm L 50 =24.9 cm Df Deviance Resid. Df Resid. Dev P(>|Chi|) NULL 503 198.92 talla 1 60.75 502 138.18 6.489e-15 *** color 1 16.35 501 121.82 5.257e-05 *** talla:color 1 4.89 500 116.94 0.02706 *
    • 12. RESULTS A 50 =2.7 yr Maturity ogive (age) Df Deviance Resid. Df Resid. Dev P(>|Chi|) NULL 234 127.076 talla 1 36.743 233 90.334 1.348e-09 *** color 1 0.974 232 89.359 0.32361 talla:color 1 2.802 231 86.557 0.09415 .
    • 13. RESULTS L 50 =43.9 cm L 50 =38.4 cm L 50 =47.7 cm Sex change ogive (length) Df Deviance Resid. Df Resid. Dev P(>|Chi|) NULL 684 481.59 talla 1 69.94 683 411.64 2e-16 *** color 1 96.87 682 314.77 < 2e-16 *** talla:color 1 1.43 681 313.35 0.2322
    • 14. RESULTS A 50 =10.7 yr A 50 =10.5 yr A 50 =11.5 yr Sex change ogive (age) Df Deviance Resid. Df Resid. Dev P(>|Chi|) NULL 414 284.88 talla 1 133.09 413 151.79 < 2.2e-16 *** color 1 11.72 412 140.07 <0.000618 *** talla:color 1 3.99 411 136.08 0.045771 *
    • 15. RESULTS K=0.31 Linf=37.8 T 0 =-1.48 Growth: Von Bertalanffy Model L=Linf*(1-exp(-k*(T-T 0 )))
    • 16. RESULTS K=0.31 Linf=37.8 T 0 =-1.48 Chow test F=51.2 P<0.001 K m =0.38 Linf m =36.3 T 0m =-0.65 K p =0.06 Linf p =62.5 T 0p =-7.85 Growth: Von Bertalanffy Model L=Linf*(1-exp(-k*(T-T 0 )))
    • 17. RESULTS K m =0.38 Linf m =36.3 T 0m =-0.65 Growth: Von Bertalanffy Model L=Linf*(1-exp(-k*(T-T 0 ))) K p =0.06 Linf p =62.5 T 0p =-7.85
    • 18. RESULTS Growth: otolith size Fish length - Otolith wide Fish length - Otolith length Estimate Std. Error t value Pr(>|t|) (Intercept) 0.58 0.22 2.61 0.00959 ** talla 0.14 0.01 21.14 < 2e-16 *** colorpinto 0.57 0.33 1.69 0.09200 . talla:colorpinto -0.03 0.01 -3.01 0.00286 ** Estimate Std. Error t value Pr(>|t|) (Intercept) 0.16 0.15 1.07 0.29 talla 0.07 0.00 16.58 < 2e-16 *** colorpinto 0.45 0.22 2.03 0.043030 * talla:colorpinto -0.02 0.01 -3.39 0.000816 ***
    • 19. DISCUSSION  Labrus bergylta spawns in January-April in Galicia, two months earlier than in Norway (Muncaster et al., 2010) and in synchronization with the main upwelling event in the region, just before the first phytoplanckton bloom.  Maturity is reached at 23.4 cm / 2.7 yr, what is above the minimum legal size of capture (20 cm).  Sex change occurs at 43.9 cm/10.7 yr, but there is a great range.  Growth : Labrus bergylta is a slow growth species. Phytoplanckton blooms in Galicia Sex Length range (cm) Age range (yr) Female 19.6 – 46.2 2 - 14 Transition 25.5 – 53 2 - 13 Male 28.9 - 51.8 6 - 21
    • 20. DISCUSSION Does growth rate affect reproductive potential?  Labrus bergylta is present in two patterns of coloration. The mottled pattern growths faster, what implies a bigger size at maturity and sex change. Non mottled Mottled
    • 21. THANKS e-mail: villegas@iim.csic.es

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