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ACTIVITY PROGRESS REPORT IMARPE. -WP 7 - PowerPoint PPT Presentation


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ACTIVITY PROGRESS REPORT IMARPE. -WP 7. Claudia Wosnitza-Mendo Michael Ballón Carlos Benites. PERU Main distribution area of the demersal fish species. INVESTIGATED SPECIES Hake (Merluccius gayi peruanus) Lumptail searobin (Prionotus stephanophrys)

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slide1

ACTIVITY PROGRESS REPORT

IMARPE. -WP 7

Claudia Wosnitza-Mendo

Michael Ballón

Carlos Benites

slide3

INVESTIGATED SPECIES

Hake (Merluccius gayi peruanus)

Lumptail searobin (Prionotus stephanophrys)

Peruvian rock seabass (Paralabrax humeralis)

Peruvian banded croaker (Paralonchurus peruanus)

slide4

Mean length at Maturity

Hake example ( females)

Maturity ogives of hake for different periods

slide5

Mean length at Maturity (hake example)

Mean length of hake (Paita fleet) vs Lm 50.

slide6

Optimum length (Lopt) Croaker example

Problem: different biological parameters lead to a different Lopt

Lopt

29.06

Parameters: Loo to k M

50.28 -0.2533 0.23159 0.50748

Lopt

28.63

Parameters: Loo to k M

53.3 -1.661 0.137 0.35414

Lmax 65 cm

slide7

% Megaspawners croaker

Lopt+10% Lopt = 32 cm

slide9

Complementary research

Fish Condition and reproduction activity

Long term

Upward trend in condition factor

Downward trend in reproduction activity

Short term

Negative impact of El Niño

In both: Fish condition and reproduction

slide11

Papers in progress

  • Long-term changes in mean length at maturity of four Peruvian demersal species
  • Trend in relative investment of energy in growth and/or reproduction by Peruvian hake from 1972 – 2004: an issue of length dependence
  • Spatial separation of spawning units of hakeMerluccius gayi peruanus