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Parasites of commercial fishes as bioindicators of marine pollution: A preliminary study Parasites of commercial fishes as bioindicators of marine pollution:

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Presentation on theme: "Parasites of commercial fishes as bioindicators of marine pollution: A preliminary study Parasites of commercial fishes as bioindicators of marine pollution:"— Presentation transcript:

1 Parasites of commercial fishes as bioindicators of marine pollution: A preliminary study Parasites of commercial fishes as bioindicators of marine pollution: A preliminary study Ana Pérez-del Olmo, Mercedes Fernández, Francisco E. Montero, Juan Antonio Raga & Aneta Kostadinova Ana Pérez-del Olmo, Mercedes Fernández, Francisco E. Montero, Juan Antonio Raga & Aneta Kostadinova Cavanilles Institute of Biodiversity and Evolutionary Biology University of Valencia, Spain Cavanilles Institute of Biodiversity and Evolutionary Biology University of Valencia, Spain Vertimar 2005

2 External anomalies Length-weight relationships Detoxifying enzymes Hematological values Histopathology Pollutant concentration Parasitism External anomalies Length-weight relationships Detoxifying enzymes Hematological values Histopathology Pollutant concentration Parasitism Bioindicators in marine organisms

3 External anomalies Length-weight relationships Detoxifying enzymes Hematological values Histopathology Pollutant concentration Parasitism External anomalies Length-weight relationships Detoxifying enzymes Hematological values Histopathology Pollutant concentration Parasitism

4 Parasites as Bioindicators Transmission through trophic webs (Marcogliese & Cone, 1997) Alteration of parasite´s environment (Khan, 1987) Life cycles shorter than those of their hosts Heavy metal accumulation (Sures, 2003) More parasitic than free living species (MacKenzie, 1999) Transmission through trophic webs (Marcogliese & Cone, 1997) Alteration of parasite´s environment (Khan, 1987) Life cycles shorter than those of their hosts Heavy metal accumulation (Sures, 2003) More parasitic than free living species (MacKenzie, 1999)

5 “Exxon Valdez” (Alaska) “Exxon Valdez” (Alaska) “Amoco Cadiz” (France) “Amoco Cadiz” (France)

6 Boops boops (Bogue – Boga) Boops boops (Bogue – Boga) Micromesistius poutassou (Blue whiting – Lirio) Aim To investigate the medium-term impact of the oil spill from the “Prestige” using pre- and post-spill information on parasite infections from two commercial fish.

7 “Prestige” oil spill km affected

8 Micromesistius poutassou Family Gadidae aa Mesopelagic Small crustaceans (euphausiids, amphipods). Large individuals may prey on fish and cephalopods Family Gadidae aa Mesopelagic Small crustaceans (euphausiids, amphipods). Large individuals may prey on fish and cephalopods 3000 m 160 m 30 – 400 m

9 Vigo 60 fish: 2000 & 2004 Micromesistius poutassou Vigo

10 Digenea(benthic-neritic)Digenea(benthic-neritic) Nematoda(pelagic)Nematoda(pelagic)

11 Distribution of abundance

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13 Boops boops Family Sparidae aaaaaaaaaa Inshore Waters ( m) Demersal or semipelagic above various bottoms Omnivorous (young mostly carnivorous, adults mostly herbivorous) Family Sparidae aaaaaaaaaa Inshore Waters ( m) Demersal or semipelagic above various bottoms Omnivorous (young mostly carnivorous, adults mostly herbivorous)

14 Malpica Vigo OndarroaOndarroa 120 fish: 2001 & 2004 Boops boops

15 Parasites of Boops boops Pre-spill samples: Post-spill sample: Total: 26 metazoan parasites Isop.Copep.Monoge.Nematod.Acantho.Cestod.Digen.Total Vigo Malpica Ondarroa Malpica BeforeVigoAfterMalpica 2 Malpica 1 Ondarroa BeforeVigoAfterMalpica 2 Malpica 1 Ondarroa

16 Before After Parasite richness mean  SD Parasite richness mean  SD Parasite abundance mean  SD Parasite abundance mean  SD Malpica (M2) Malpica (M1) Vigo (V1) Ondarroa (O1) Malpica (M2) Malpica (M1) Vigo (V1) Ondarroa (O1) Parasite Communities

17 Samples P (%) M2M1V1O1 ns *** Monoxenous parasites: Prevalence Monoxenous parasites: Prevalence direct cycle-ectoparasites

18 Prevalence of monoxenous by group Monoxenous parasites: Species richness Monoxenous parasites: Species richness ns *** ns *** Monoxenous parasites: Abundance

19 MONOXENOUS PARASITES (direct cycle-ectoparasites) MONOXENOUS PARASITES (direct cycle-ectoparasites) HETEROXENOUS PARASITES (indirect cycle-endoparasites) HETEROXENOUS PARASITES (indirect cycle-endoparasites) Ratio Sm/Sh Diamant et al. (2003) ns ***

20 PAHs Immunosupression ELEVATED LEVELS OF MONOXENOUS INFECTIONS ELEVATED LEVELS OF MONOXENOUS INFECTIONS Gill hyperplasia Excessive mucous secretion Coagulation of mucus Gill hyperplasia Excessive mucous secretion Coagulation of mucus Haensy et al. (1982): Amoco Cadiz oil spill Moles & Wade (2001): experimental study Khan (1990; 2003): experimental & field studies Haensy et al. (1982): Amoco Cadiz oil spill Moles & Wade (2001): experimental study Khan (1990; 2003): experimental & field studies

21 Pollution & Parasites increase Immunosupression EctoparasitesEctoparasites Endoparasites decrease Interruption of life cycles MacKenzie (1999), Khan (2003)

22 * No substantial perturbation of the benthic intermediate hosts ns *** Heteroxenous parasites: Abundance Heteroxenous parasites: Abundance Heteroxenous parasites: Species richness Heteroxenous parasites: Species richness ns *** Samples No. sp. M2 M1 V1 O1

23 Mean no. of sp. Mean no. of ind. Still … 3 Atlantic 3 Mediterranean 3 Atlantic 3 Mediterranean

24 Future research Parasitism Length-weight relationship External anomalies Hematological values Histopathology Pollutant concentration Parasitism Length-weight relationship External anomalies Hematological values Histopathology Pollutant concentration

25 Thanks are due to: Ministerio de Educación y Ciencia (APO holds a FPU grant and MF holds a “Ramón y Cajal” contract) Fundación Azti (Sukarrieta), IIM (CSIC) Pescados Rivas (Fisterra), Lonjas de Bueu y Ribeira Unidad de Zoología Marina (ICBIBE, Universitat de València) Thanks for your attention! Ministerio de Educación y Ciencia (APO holds a FPU grant and MF holds a “Ramón y Cajal” contract) Fundación Azti (Sukarrieta), IIM (CSIC) Pescados Rivas (Fisterra), Lonjas de Bueu y Ribeira Unidad de Zoología Marina (ICBIBE, Universitat de València) Thanks for your attention!

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28 Micromesistius poutassou


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