Jellyfish as a predator and prey of fishes: underwater observations and rearing experiments
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1 Jellyfish as a predator and prey of fishes: underwater observations and rearing experiments Reiji Masuda, Yuko Miyajima, Ryosuke Ohata, Yoh Yamashita Maizuru Fisheries Research Station Kyoto Univ.
2 Catch (thousand tons) Fish species alteration Sardine Sardinops melanosticutus Chub mackerel Scomber japonicus Japanese anchovy Engraulis japonicus Jack mackerel Trachurus japonicus
3 Fish-jelly interaction: Predator Prey Commensalism
4 Five-minute trial of survival when exposed to moon jellyfish (Aureria sp.) Captured anchovy larva
5 Time to be eaten by jellyfish (sec) 3 Masuda J Fish Biol 78: Jack mackerel 12 Trachurus japonicus 6 Chub mackere Scomber japonicusl Japanese anchovy Engraulis japonicus Body length (mm)
6 Tolerance to jellyfish Threadsail filefish Leather jacket > Jack mackerel > > Red sea bream Chub mackerel Anchovy Masuda 211. J Fish Biol 78: Miyajima et al. unpublished data. Anchovy larvae 2 mm SL (hatchery-reared) Anchovy larvae rely on their transparency for predator avoidance ---> Adapted in turbid environment to avoid visual predator
7 Survival rate (%) mm mm a 1 15 mm a 1 2 mm * a 1 25 mm 8 6 * 4 2 a マアジ * b a a a a * * * * * * * クラゲ Jack Jelly * 5 3 Turbidity (ppm) b b b Ohata, Masuda, Yamashita 211. J Fish Biol 79: Turbidity did not work as a refuge against jellyfish Eutrophication Hypoxia *1 Jellyfish blooms Turbidity *1 Shoji et al. 25. Mar Biol 147:
8 Threadsail filefish feeding on giant jellyfish Nemopilema nomurai (Nov 25, Kanmuri-jima, Maizuru)
9 65 dph, 35mm BL, 1.4g BW 2 ind. each, duplicated 16 days feeding Jelly Starved Krill + Jelly Krill Yuko Miyajima feeding jelly to filefish (Sep 28, Maizuru Fish. Res. Stn.)
10 BL growth (% d -1 ) BW growth (% d -1 ) c d n=2 n=38 c d Starved Jelly b b a n=39 n=4 Krill a Krill + Jelly Filefish 1. can survive and grow by feeding only jellyfish 2. can attain some supplemental nutrition from jellyfish. Miyajima, Masuda, Kurihara, Kamata, Yamashita, Takeuchi 211. Fish. Sci. 77:
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12 Feeding jellyfish to red sea bream Pagrus major QuickTimeý Dz êlí ÉvÉçÉOÉâÉÄ Ç Ç±ÇÃÉsÉNÉ`ÉÉǾå ÇÈÇžÇ½Ç ÇÕïKóvÇ-ÇÅB
13 1. Starvation 2. Moon jellyfish 3. Pellets 4. Pellets & jellyfish QuickTimeý Dz êlí ÉvÉçÉOÉâÉÄ Ç Ç±ÇÃÉsÉNÉ`ÉÉǾå ÇÈÇžÇ½Ç ÇÕïKóvÇ-ÇÅB (1 ind.. X 3 or 7 tanks, 117 days) Miyajima feeding jelly to red sea bream (Sep 21, Maizuru Fish. Res. Stn)
14 Four months later QuickTimeý Dz êlí ÉvÉçÉOÉâÉÄ Ç Ç±ÇÃÉsÉNÉ`ÉÉǾå ÇÈÇžÇ½Ç ÇÕïKóvÇ-ÇÅB (Dec 21, Maizuru Fish. Res. Stn)
15 BL growth (% d -1 ) BW growth (% d -1 ) b b b b Starved Jelly Pellet Pellet + Jelly a a a a Red sea bream cannot grow by feeding on jellyfish Supplemental nutrition? Miyajima et al. unpubl.
16 Tilting behavior Defined by Uchida et al Nippon Suisan Gakkaishi 59: P <.1 QuickTimeý Dz êlí ÉvÉçÉOÉâÉÄ Ç Ç±ÇÃÉsÉNÉ`ÉÉǾå ÇÈÇžÇ½Ç ÇÕïKóvÇ-ÇÅB 4 No. of fish Tilting Non-tilting Tilting Pellet Non-tilting Pellet & Jelly
17 Order Tetradontiformes Monacanthidae (filefish, leatherfish) Tetradontidae (pufferfish) others Tiger puffer (Sep 212, Shimonoseki)
18
19 Miyajima et al. unpublished Growth (% d -1 ) c D BL BW c D a A b B -1-2 Starved Jelly Pellet Pellet + Jelly
20 Behavior and body contents of jellyfish-fed pufferfish Activity( %) Response(% ) a a ab Starved Jelly Pellet Pellet & Jelly Lipids(%) 7.6c 6.71c 19.4a 16.3b DHA(%) 9.6b 12.4a 1.4b 12.1a Glysin 27.8b 47.9b 134a 111a Glutamic acid 39.3b 75.1a 44.3b 46.3b (mg/1g d.b.) a b b a ab
21 Sashimi of giant jelly Good for your health! (July 29, Pub in Maizuru)
22 Temperature of jellyfish consumption by threadsail filefish 28 C 25 C 22 C 13 C 16 C 19 C QuickTimeý Dz êlí ÉvÉçÉOÉâÉÄ Ç Ç±ÇÃÉsÉNÉ`ÉÉǾå ÇÈÇžÇ½Ç ÇÕïKóvÇ-ÇÅB QuickTimeý Dz êlí ÉvÉçÉOÉâÉÄ Ç Ç±ÇÃÉsÉNÉ`ÉÉǾå ÇÈÇžÇ½Ç ÇÕïKóvÇ-ÇÅB Feeding & Growth 14 days 1 C
23 Jellyfish consumption (per body weight) (Masuda unpubl.) 1.6 QuickTimeý Dz êlí ÉvÉçÉOÉâÉÄ Ç Ç±ÇÃÉsÉNÉ`ÉÉǾå ÇÈÇžÇ½Ç ÇÕïKóvÇ-ÇÅB Mar 28 Average temp. 19. QuickTimeý Dz êlí ÉvÉçÉOÉâÉÄ Ç Ç±ÇÃÉsÉNÉ`ÉÉǾå ÇÈÇžÇ½Ç ÇÕïKóvÇ-ÇÅ 1 n= Temperature ( C) Nov 25
24 Filefish feed on jellyfish (Aurelia) polyps QuickTimeý Dz êlí ÉvÉçÉOÉâÉÄ Ç Ç±ÇÃÉsÉNÉ`ÉÉǾå ÇÈÇžÇ½Ç ÇÕïKóvÇ-ÇÅB Miyajima et al. unpublished data (212)
25 Occurrence (%) Swimming Feeding benthos Feeding jelly Aggressive Immobile at <13 C Feeding benthos at >17 C Feeding jellies at >19 C Aggressive at >19 C Temperature ( C) (Masuda unpubl.)
26 Leatherfish feeding on giant jellyfish (Sep 29, Off Maizuru)
27 QuickTimeý Dz ÉÇÅ[ÉVÉáÉì JPEG OpenDML êlí ÉvÉçÉOÉâÉÄ Ç Ç±ÇÃÉsÉNÉ`ÉÉǾå ÇÈÇžÇ½Ç ÇÕïKóvÇ-ÇÅB
28 QuickTimeý Dz ÉÇÅ[ÉVÉáÉì JPEG OpenDML êlí ÉvÉçÉOÉâÉÄ Ç Ç±ÇÃÉsÉNÉ`ÉÉǾå ÇÈÇžÇ½Ç ÇÕïKóvÇ-ÇÅB
29 QuickTimeý Dz ÉÇÅ[ÉVÉáÉì JPEG OpenDML êlí ÉvÉçÉOÉâÉÄ Ç Ç±ÇÃÉsÉNÉ`ÉÉǾå ÇÈÇžÇ½Ç ÇÕïKóvÇ-ÇÅB
30
31 Commensalism Jack mackerel associating with giant jellyfish (Nov 26, Kanmuri Isl., Maizuru)
32
33 Jack mackerel associating with Japanese sea nettle Chrysaora melanaster (Jun 28, Maizuru)
34
35 Why jack associates with jellies? 1. Predator avoidance 2. Feeding 3. Migration
36 Predator avoidance? Jelly (Aurelia sp.) Association Survival Predator (Scomber japonicus) Jelly & Predator
37 Predator Jelly Predator Jelly & Predator
38 Feeding jelly to jack Provide jellyfish (Aurelia sp.) to jack mackerel No feeding Masuda 26. Fish Sci 72:
39 Jack utilize jelly as a prey collector? Artemia & Jellyfish Artemia Masuda et al. 28. Fish Sci 74:
40 Jack mackerel stealing Artemia from jellyfish Aurelia sp. (Aug 25).
41 Underwater observation of giant jellyfish Nemopilema nomurai Source of giant jelly Maizuru Fish Res Stn Tsushima Kyoto Univ Spawning ground of jack mackerel A total of 192 giant jellyfish Ca. 35 h of u/w observation
42 Frequency Tsushima CV= Maizuru CV=.8 6 Maizuru CV= BL of jack mackerel (mm) Sep 6 Tsushima Aug 6 Maizuru
43 Predator density assessed by Fin-kick transect No. of ind. /1m 3 (Mean±SE) Pelagic predator Jack mackerel Tsushima p<.1 p<.1 Benthic predator n=54 n=43 Maizuru Masuda 29a Hydrobiologia 616: Grouper Epinephelus bruneus (Sep 6, Tsushima) Yellowtail Seriola quinqueradiata (Dec 6, Maizuru) Jack mackerel Trachurus japonicus (Dec 6, Maizuru)
44 Function of association with jellyfish gradually change ontogenetically Feeding Hiding Aggregating & Migration
45 Phytoplankton Sardine Warm temp. Anchovy Copepods Chub mackerel Jack mackerel Jellyfish Other fishes Masuda 29b AquaBiosci Monogr 2(2): 1-56.
46 Conclusion Fish-jelly interaction is species-specific and size (stage) dependent Jellyfish can be energy and nutritious source for fishes To prevent jellyfish blooms 1) Reduce fishing pressure 2) Conserve habitats for reef fish (Nov 29, off Maizuru)
47 Reproduction No. of eggs per body weight Jack Chub Sardine Anchovy Nishida 24 Aoki 1996 Tsuruta 1992 Yamada et al. 1998
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