Baldascino, Elena

Bartolomé-Baraza, A. (Aurora)

Fiorito, Graziano

Perales-Raya, C. (Catalina)

English

Baldascino, E. (Elena)

Fiorito, G. (Graziano)

Repositorio Institucional Digital del IEO

30/09/20161C li  P l R   A  B l   El  STRESS MARKS OF TWO FISHING METHODS IN OCTOPUS BEAKSata na era es- aya, urora arto omé, enaBaldascino  and Graziano FioritoThe stress of capture in octopuses is coded as a darker and deeper mark in th  b k tiStress of capturecapture stressDeathe ea sec onsComparison of growth rates after different events and treatments suggests that capture is one of the most stressful events for the animalIs the stress of capture affected by the fishing method?Perales-Raya et al. 2014b30/09/20162Animals caught in Bay of Napoli (Italy) • 33 octopuses by traps MATERIAL AND METHODS: the sampleThey were moved to the culture facilities at SZN, where they lived for 2-55 days• 32 octopuses by jiggingAfter death in lab, the beaks were sent to the IEO for their analysisCut the rostrum areaMount in lateral positionBEAKS - Rostrum Sagittal Sections for stress analysisHow to prepare    Rostrum Sagittal Sections         Ground carborundum paperPolish 1μm diamond pasteCover with more resin(RSS)  0Perales-Raya et al. 201030/09/20163How to prepare Lateral Wall Surfaces Cut along the CrestBEAKS - Lateral Wall Surfaces for age estimation(LWS) 03mmAdd some drops of distilled waterPerales-Raya et al. 2010JIGGING: stress mark around capture in 100% of beaks 14 days / 14 rings7 days / 7 rings42 days / 41 rings 14 days / 14 rings30/09/20164TRAPS: stress mark around capture in 68% of beaks34 days / 30 rings 34 days / 31 rings38 days / 39 rings38 days / 37 rings600700Jiggs TrapsAGE 200300400500Weight (g)01000 30 60 90 120 150 180 210 240 270 300 330 360 390 420Age (daily rings)Age: 4 – 13 months30/09/201655060kKendall’s coefficient of concordance days-rings O erall W  0 76Relationship days-rings from capture203040Rings from capture markJiv = .Jiggs W = 0.97(very high)Traps W = 0.67    (good)Capture method associated to days-0100 10 20 30 40 50 60Days from captureggsTrapsrings overlapping     (Chi-square n=59; df=1; p<0.05)• Significant overlapping between days elapsed and rings deposited from capture• The capture method is significantly associated to the l i  d i  f  tCONCLUSIONSover app ng ays-r ngs rom cap ure• Jigging faster but more stressing for capturing octopuses (radical confinement) • Traps take more time for fishing octopuses (gradual confinement) and seems to be a less stressing capture methodNext steps To assess possible accumulated after-capture stress (during acclimatization to lab)  To analyze stress caused by specific experiments in lab30/09/20166Thanks for your attention

Stress marks of two fishing methods in octopus beaks

Perales-Raya, Catalina

Bartolomé-Baraza, Aurora

Digital.CSIC

http://www.repositorio.ieo.es/e-ieo/bitstream/10508/10583/1/Perales-Raya%20et%20al%20CIAC2015-oral.pdf

Stress marks of two fishing methods in octopus beaks

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