IZE TRUCTURE BAED AOCIATION BETWEEN ANCHOVETA AND OTHER PELAGIC REOURCE IN PERU iguel Ñiquen arilu Bouchon, Andres Chipollini y Cecilia Peña INTITUTO DEL AR DEL PERU
OUTLINE Goal & Data Presence of mixed schools ize structure A/ y A/ Distribution A/ y A/ Conceptual model for Interactions Position of oceanic front Proposal of a circuit Conclusion
GOAL To describe interactions between anchovy and other pelagics, with emphasis on their distribution and size structure during warm periods. DATA On board observations, in Purse seine fleet. between 1996 to 2016 pecies composition and size structure by set. Pelagic resources monitoring on landings port. ea surface temperature anomalies in Chicama (07 30 ) from 1996-2016
-4-2 0 2 4 6 8 J96 J97 J98 J99 J00 J01 J02 J03 J04 J05 J06 J07 J08 J09 J10 J11 J12 J13 J14 J15 J16 AT - Chicama (07 30') Presence of mixed schools Anchoveta ardina Caballa Niño Niño 96 2016
About size composition in 3 cases and sardine 140000 120000 100000 ANCHOVY Number of de individ 80000 60000 40000 20000 0 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39 400000 350000 ARDINE ANCHOVY 300000 Number of de individ 250000 200000 150000 100000 50000 0 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39 140000 120000 ARDINE Number of de individ 100000 80000 60000 40000 20000 0 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39 Total Length (cm)
About size composition in 2 cases and pacific mackerel & ackerel Coastal zone Frecuencia /%) 60.00 50.00 40.00 30.00 20.00 10.00 0.00 Incidental 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 Longitud Horquilla (cm) caballa anchov Only ackerel Not anchovy Oceanic zone
About distribution by zones and sardine izes modal of anchovy and sardine (cm) ardine ixed Diferences in sizes modal (cm) between anchovy and sardine in mixed hauls
About distribution by zones and pacific mackerel Only ackerel Not anchovy Oceanic zone & ackerel Coastal zone 4 Pta. al 6 Talara Paita Pta. La Negra Pimentel Presencia de Caballa Programa de Observadores a Bordo 8 10 12 14 alabrigo alaverry Chimbote Casma Huarmey upe Huacho Chancay Callao Pucusana Cerro Azul Pisco Bahia Independencia 16 an Juan arcona Atico ollendo 18 Ilo ama 20
Conceptual odel for interaction / ardine (other pelagics) Evidence indicates that the interaction is related to adult anchovy with juvenile sardine and it develops in two different spatially and oceanographically zones. 10cm 20cm 30cm 40cm 50cm 60cm 1 2 3 4 5 6 7 8 9 11 12 13 14 15 16 17 18 19 21 22 23 24 25 26 27 28 29 31 32 33 34 35 36 37 38 39 41 42 43 44 45 46 47 48 49 51 52 53 54 55 56 57 58 59 10 20 30 40 50 60 ardine P. mackerel J. mackerel juvenile adult
Conceptual odel for interaction / ardine (other pelagics) Evidence indicates that the interaction is related to adult anchovy with juvenile sardine and it develops in two different spatially and oceanographically zones. 10cm 20cm 30cm 40cm 50cm 60cm 1 2 3 4 5 6 7 8 9 11 12 13 14 15 16 17 18 19 21 22 23 24 25 26 27 28 29 31 32 33 34 35 36 37 38 39 41 42 43 44 45 46 47 48 49 51 52 53 54 55 56 57 58 59 10 20 30 40 50 60 ardine P. mackerel J. mackerel juvenile adult
Conceptual odel for interaction / ardine (other pelagics) Evidence indicates that the interaction is related to adult anchovy with juvenile sardine and it develops in two different spatially and oceanographically zones. 10cm 20cm 30cm 40cm 50cm 60cm 1 2 3 4 5 6 7 8 9 11 12 13 14 15 16 17 18 19 21 22 23 24 25 26 27 28 29 31 32 33 34 35 36 37 38 39 41 42 43 44 45 46 47 48 49 51 52 53 54 55 56 57 58 59 10 20 30 40 50 60 ardine P. mackerel J. mackerel juvenile adult Coastal zone Oceanic zone
Come back to the data. Interactions anchovy-sardine, 1998 ardine 17% 60 50 30 miles 40 % 30 20 83% 10 0 10 12 14 16 18 20 22 24 26 28 30 32 34 36 ardine anchovy sardine 0% 60 50 60 miles 40 % 30 20 ardine ardine 100% 10 0 10 12 14 16 18 20 22 24 26 28 30 32 34 36 anchovy sardine
Interactions anchovy-pacific mackerel, 2016 35.00 30.00 25.00 ackerel Frecuencia (%) 20.00 15.00 10.00 5.00 0.00 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 Length (cm) ackerel ackerel Frecuencia (%) 45 40 35 30 25 20 15 10 5 0 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 Fork length(cm) ackerel
Changes of the position of oceanic front patialy Temporally Far from the coast Near to the coast
ore data. Horizontal View LILIANA December 2016 11 30 1 1 Callao Oceanographic Line 12 00 3 2 1 2 Catch 7 set Track per day
Vertical View OCEANOGRAPHIC LINE: CALLAO 1612 - R/V LUI FLORE PORTUGAL 06 th - 07th December 2016) Temperature ( C) CTD alinity (ups) CTD Oxigen (ml/l) CTD ixed school vertical distribution 2007 Frente oceánico alejado TEPERATURA ALINIDAD 0 0 50 50 100 100 150 150 200 200 250 250 300 300 ECCION CALLAO (22-23/0872007) CTD : conductivity, temperature and depth) 350 350 400 400 450 450 500 100 50 0 500 100 50 0
Proposal of a circuit When the oceanic front is near to the coast, then the circuit repeats quickly; While when it is far away, then the circuit is difficult to meet. The circuit is closer in warm periods
Looking for historical data. Proposal of a circuit alinidad superficial del mar durante el Crucero de marzo de 1998. What happens at that moment??? IN 1998 The oceanic front was very near to the coast. < ----------
CONCLUION 1 2 3 There is interaction between adult anchovy and juvenile sardine, jack mackerel and pacific mackerel in coastal areas, whereas in oceanic areas there is only interaction between adult specimens of these species, without anchovy participation. These evidence suposse the generation of a circuit in the life cycle of the sardine, jack mackerel, mackerel, that goes from juvenile coastal zone to adult oceanic zone and vice versa, according far away or closing of the oceanic front. The direct interaction between anchoveta and sardine occur only in a given size range interval. We suppose that at this stage the competition between the two species is a key factor for the abundance of the species during the following years. The knowledge of the interactions between these pelagic resources, identified with the upwelling areas, are the basis for understanding possible mechanisms of regime shift.