What you need to know about juvenile tunas in the Philippines:

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1 What you need to know about juvenile tunas in the Philippines: N. Barut National Fisheries Research & Development Institute, BFAR J. Ingles WWF, Coral Triangle Program Stakeholders Consultation Workshop on Saving the Juvenile Tunas Greenleaf Hotel, General Santos City September 1, 213

2 Outline of Presentation Some facts about tuna fisheries What is juvenile tuna? How much juvenile tunas do we harvest? Where and When are Juvenile tunas found? Why are juvenile tunas important to us? What needs to be done.

3 Depletion Ratio Depletion Ratio Total Biomass Adult Biomass yft bet skj.4.2 yft skj bet

4 What is a juvenile tuna Juvenile tuna or immature tunas are those fish that have not reached age of maturity or reached the ability to reproduce. Length/Age at Maturity (Lm) many interpretations the average minimum length or its corresponding age of the fish that is reproductively capable. Minimum length of spawning fish L 5 = length / age where 5% of the new recruits become reproductively capable SKJ = 45 cm; YFT= 1 cm; BET= 15 cm

5

6 Quantity ( tons) How much do we harvest? Total Tuna Harvest SKJ YFT BET Year Accuracy of estimates improved significantly (2 yrs) Declining trend for all 3 principal species Arguably decline partly due to compliance (high seas closure) Source: WCPFC Yearbook 212

7 How much juvenile tunas are harvested? 21 Juvenile Tuna catch estimate (mt) Gears SKJ YFT BET TOTAL PS RN HL large HL small Total Juveniles 192,11 mt HL large HL small RN PS % For 21, 9.8 % of total catch of our tunas are classified as juveniles Both commercial and artisanal gears catch significant quantities; Handline Large harvest predominantly mature individuals Sources: WCPFC Yearbook 212 for total harvest; NSAP database

8 Frequency Frequency Where are juvenile tunas found? 2 Skj: Lagonoy Gulf (24) 15 1 Juv = 43% Mature = 57 % Fork Length (cm) YFT: Lagonoy Gulf (24) Fork Length (cm) Sources: LF from FRMP Project 24; Map redrawn from WWF-PPTST

9 Frequency Frequency Where are juvenile tunas found? 5 4 Pacific Seaboard (Off Samar) SKJ: HL & TL Fork Length (cm) YFT: HL&TL Source: WWF FAD report Fork Length (cm) Source: NSAP database

10 Frequency Frequency Frequency () Where are juveniles found? BET: Moro Gulf/ Celebes Sea YFT: Moro Gulf/ Celebes Sea Fork Length (cm) Fork length (cm) 5 SKJ: Moro Gulf/ Celebes Sea Fork Length (cm) Sources: LF from NSAP database, map from WWF FAD report

11 Frequency Frequency Where are juveniles found? Northwestern Philippine Sea 4 3 SKJ: DLL&TL Fork Length (cm) YFT:DLongline Fork Length (cm) Sources: LF data from NSAP database, Map from WWF

12 Where are juvenile tunas found? Philippine EEZ Sources:

13 FAD deployment evolution in the Philippines Sources WWF 212 FAD tech report

14 Why are juvenile tunas present all year? Month Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan Feb NE Monsoon Cohort SPAWNING cm cm cm SW Monsoon Cohort cm cm 45-6 cm SPAWNING 45-6 cm cm Migrates to the Pacific cm Yellowfin Tuna Juvenile tunas occur all year; Two cohorts per year; Recruitment to the fishery (~2 cm) occur in April-May and Nov-Dec of each year Smaller individuals in nearshore waters and on upper level of water column; Sizes from 6-1 cm (5-25 kg) disappears from catches and rarely caught in Phil inzone waters; Sources: yamanaka, 1989;

15 How fast do yft grow? YFT = cm FL and kg in year cm = 2.5 mm/d; cm =.96 cm/d Source: Yamanaka, 1989 Source: Lehodey & Leroy, Age and growth of yellowfin tuna (T. albacares from the Western and Central Pacific Ocean as indicated by daily growth increments and tagging data

16 How fast do skj grow? SKJ = up to 27 cm = 1.6 mm/d; cm=.8 mm/day Source: Uchima & Struhsaker, 1981

17 Why are juvenile tunas important to us? Food 192, tons could feed 5.3 million Filipinos P7/kg, value approximates P13.44 billion Jobs unknown but significant number of direct and indirect beneficiaries that are dependent on juvenile and adult tuna fisheries!! Why are juvenile tunas important to the rest of the world? Ph-born tunas supply undetermined portion of the Western and Central Pacific tuna stocks that are harvested by the DWF that includes Philippine owned companies.

18 If saving our juvenile tunas is vital to our economy and to our survival... what needs to be done?

19 We need to: manage the harvest of tunas (both juvenile and adults) by limiting our harvest at a level that we will continue to benefit and allow sufficient numbers to reproduce to replenish the population taken by the fisheries; find a way to compensate our fishers from social and economic cost arising from compliance with conservation measures; Conduct focused research, to provide the decision basis for the policies. Identify innovative solutions to the issue, prototype the solution, pilot test and upscale the feasible ones.

20 Thank you for your kind attention

21 PS RN Hand line H&L/ MHL DGN Troll Skipjack Yellowfin no data 1. Bigeye no data no data 21 SKJ YFT BET TOTAL PS RN HL large HL small Total Juveniles 19211

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