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Diapositiva 1

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'Does polyculture of bivalve molluscs and fin fish reduce environmental impact? ... Biometry. Dry weight. 55 C 72 hours. Stable isotope ratio analyses: ... – PowerPoint PPT presentation

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Title: Diapositiva 1


1
Department of Ecology and Hydrology University
of Murcia Does polyculture of bivalve molluscs
and fin fish reduce environmental impact?
Francisco NAVARRETE-MIER, Carlos SANZ-LÁZARO
Arnaldo MARÍN 2009
2
INTRODUCTION
  • Intensive fish culture is a widely spread method
    around Europe, especially in the Mediterranean
    Sea
  • Activity increasing
  • since 1990 ?
  • 5 annually

3
  • Water Enrichment ? Organic matter

4
  • Labile dissolved

  • material

  • influence

Non consumed pellets Excreta
Benthos
Benthic Organisms
5
  • Is polyculture systems an alternative?
  • Integrated bivalve fish culture model is simple

  • Is It Really working?
  • The use of stable isotopes of C and N could help
    to understand the food web structure

6
  • Objectives
  • To valuate the growth of bivalves in a gradient
    of distance from floating fish cages.
  • To determinate oysters and mussels approaching of
    wastes from non consumed food or fish faeces by
    stable isotopes measures.
  • To analyse bivalves metals accumulation from feed
    or antifouling by its concentrations in a
    gradient of distance from the culture.

7
Materials and Methods
37º 24 56 N 1º 32 04 W Águilas - Spain
8
Cultured species
European sea bass Dicentrarchus labrax
  • Gilthead seabream
  • Sparus aurata

9
Total depth 31 m Tº 21
26ºC Annual production 1000 ton 83 000 kg of
fish Daily feed input 994 kg (computer system
with underwater video cameras)
Two groups of 12 net cages Each cage 25 m
diameter 19 m deep
10
Sites
11
Bivalves
Mytillus galloprovincialis
Ostrea edulis
12
n 112 / specie
13
  • 15 m depth
    90 days
  • Biometry
  • Dry weight
  • 55 ºC 72 hours

14
  • Stable isotope ratio analyses
  • d13C or d15N (Rsample / Rstandar
    1) 1000 (º/oo)
  • Metal analyses
  • Cu Cd Zn
    Pb
  • Statistical analyses
  • One way analyses of variance (ANOVA)
  • Post-Hoc de Tukey HSD (a lt 0,05)

15
  • Results

a)
b)
Oysters growth after 90 days of experiment (mean
SE). a) Length of shell b) Meat dry weight
16
a)
b)
Mussels growth after 90 days of experiment (mean
SE). a) Length of shell b) Meat dry weight
17
Metals concentrations (mean SE) in oysters,
mussels and fish feed
18
d15N
d15N
d13C
d13C
Mussels
Oysters
19
Discussion
  • Objetive of responsible aquaculture ? Minimize
    the possible impacts
    to the environment
  • Efectiveness in open sea cultures ? Still
    discusing

20
  • Bivalves have significant growth ? adapted
  • Size show no diferences between sites
  • Stable Isotopes
  • C N
  • No differential
  • accumulation of
  • heavy metals

21
  • Mazzola et al (2001) and Peharda (2007) show
    diferences
  • Cheshuk et al (2003) and Taylor et al (2006) no
    differences
  • Comfirm ? Stable isotopes

22
  • Polyculture must be previusly analyzed
  • Generate new impacts

23
Thanks
24
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