Possible Ecological Interactions between Small-pelagic and Mesopelagic Fishes in the Kuroshio-Oyashio Transition Zone and Kuroshio Extension in Spring.

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Possible Ecological Interactions between Small-pelagic and Mesopelagic Fishes in the Kuroshio-Oyashio Transition Zone and Kuroshio Extension in Spring Akihiko Yatsu, Masatoshi Moku, Hiroshi Nishida, Kaori Takagi, Norio Yamashita and Hiroshi Itoh Horizontal Distribution Vertical Distribution Stomach Contents

Survey Area (Spring)

Lantern Fish Migration: Myctophum asperum (left) and Symbolophorus californiensis (right) After Sassa (2001)

Backgrounds and Purpose Kuroshio-Oyashio Transition Zone (KOTZ) and Kuroshio Extension (KE) are the key areas for recruitment of sardine, anchovy, and mackerel Mortality of anchovy larvae in KOTZ-KE is mainly caused by predation by black snake mackerel (Nealotus tripes). Biological interactions between juvenile small pelagics and myctophids may be possible because 1) myctophids are abundant in KOTZ and 2) both are zooplankton feeder Seek for possible interaction between small pelagics and micronectonic mesopelagic fishes in KOTZ DayNight Small pelagics Meso-pelagics ?

Surface Trawl Survey in Kuroshio/Oyashio Transition Zone in Spring since 1996 Net opening diam.: 27m Towing at: 3.5 knots at night Typical towing depth: 0-30m Tansyu Maru (499GT, 1800HP): Hokuho Maru (664 GT, 2200HP 2000-

CPUE (kg / 30 min tow) of Japanese Sardine and SST m and 3000m isobath Emperor Sea Mt.

Survey Index of and Estimated Recruit No. Sardine Fairly good relation indicate early survival is mainly determined after the feeding larvae distributing in Kuroshio and KOTZ Sardine (Watanabe et al., 1995)

Catch Weight Composition in 2002 (0-30m depth) Club-hook squid Enoploteuthidae Anchovy larvae Myctophids Scomber juv. Jack juv.

Adult Myctophid Biomass Composition in 2002 and 2003 (0-30m depth)

CPUE (kg / 30 min tow) of Small Pelagic Fishes and Myctophids (juv+ad) in 2000 Sardine juv Scomber spp. juv Anchovy larvae Symbolophorus californiensis Ceratoscopelus warmingii Myctophum asperum Diaphus perspicillatus 1000m and 3000m isobath SST

Size Composition of Small Pelagic Fishes and Myctophids in 2002 Juv. Sardine ad. Scomber spp. Juv. Larvae+Juv. (black) and adults (blue) Symbolophorus californiensis Ceratoscopelus warmingii Myctophum asperum Diaphus perspicillatus Standard length (mm) Anchovy

Nighttime Vertical Distribution of Small Pelagics, Myctophids and Black Snake Mackerel in May 1995 at 37N 147E

Black Snake Mackerel Nealotus tripes as a Predator

Index of Relative Importance of Diets of Black Snake Mackerel in May 2002 Larvae BSM selectively feeds on anchovy larvae (Kubota,2003) Subadults Adults Freq % in Weight % in No.

Prey Composition of Juvenile Small Pelagic Fishes and Myctophids (Adults & Juveniles) in May 2002

Stomach Contents of Sardine and Prey Availability in Kuroshio Extension during (Saito et al., 2001) Small copepods (<0.8mm BL, Paracaranus etc.) are abundant Large copepods (Calanus pacificus etc.) was less abundant Optimum prey size for juvenile sardine (25-40mm BL) is mm Juvenile sardine (>33 mm BL) selectively fed on large copepods Larval sardine (26-31 mm BL) preyed upon small copepods Juveniles of both myctophids and small pelagics fed on mm BL Paracalanus in KOTZ (our results) Size of prey (μm) Prey density (ind m -3 )

Summary Juvenile small pelagics and myctophids (ad.+juv.) horizontally overlap in surface waters (0-30m) of KOTZ in spring Black snake mackerel shift their diet from anchovy larvae, to krill and myctophids with ontogenetic descent Corycaeus and Oncea (epipelagic) were preyed by juveniles of small pelagics and some juvenile myctophids Krill, Pleuromamma and Metridia (deil vertical migrants with photophores) were exclusively consumed by myctophids Possible competition for large copepods Further studies are needed for 1) competition with juvenile myctophids for epipelagic ZP, 2) indirect effects of black snake mackerel, 3) quantitative evaluation

Spawning Stock Biomass and Recruitment of Sardine and Chub mackerel R per SSB = f (SSB, SST in key areas) but imperfect

Myctophids: Diel Vertical Migration and Feeding in Oyashio Area (Moku et al., 2000)

Prey Composition of Juvenile Small Pelagic Fishes and Myctophids (ad.+juv.) in May 2002

CPUE (catch weight per a tow) of Small Pelagic Fishes and Myctophids (juv+ad) in 1999 Sardine Juv. Scomber spp. Juv. Anchovy larvae Symbolophorus californiensis Ceratoscopelus warmingii Myctophum asperum Diaphus perspicillatus 1000m and 3000m isobath SST