;24; : 4 - ^ % jli ± ^ ^ '^^ ^ ^ 'SX IIP 45 ^ 3 / 1

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^ ^ lii f r • # ) If -5

On the post larva of Munida gregaria (Crustacea, Galatheida) in Penas Bay, Chile, with reference

to mass occurrence in 1969

Osame Tabeta and Shin-ichi Kanamaru

3 iy^- 9 x t"M®—'M Munida gregaria (Fabri-

cius) © f f « t f e ® # l i i 6 * a "Lobster krilP tmi

* 5.1- ' m^- h \t7mif-bmw%\^ i -^T I968 fp n

©tfi^fi: Munida gregaria (Fabricius) © Grimo-

thea mM}SiX'^i>^tiiiDi)>-ofz0x% ^mumv fzL0^sio^mm^Mt^'^mm> mm&^tbxo

-^-^xjga^ 'J i t fEr ' t t f i l / (Fig. 1), iJjf 47°00'-47''30'S, 74°30'~75°30'W | SA*J5itKfi!l t ^^^-t-, «©:ibi.lHi:^ ^ ^ tmAi^M^ii, 'm±^ "J

S S W S W O ^ a J f e K ^ ^ T t ^ S . C©ig©Si{fi^^g|S

(Fig. 1 © St. 1) 07KMlt^ 150ni T', 5 'J Hl^fc

n * C^^'JIiiiSM S. Villanueva B3). »#?>*>*

iiUr:7jcair0liSI)ISftli#A (32ioF» ji;, c Omx 1969 Ip 1 J5 21 0 K h n - ; H ^ f t f t * % | l f j o

fZ.'' C © K i t 3 i / t y t ' a ^ 5 £ © y ^ « ^ * t t f t ±

f}>hm^^ntz. aihomsi0^mmm%m^ztz s6, 1 jg 21-22 aizam 130 cm ©s^Majt^f ^

h*3J:2K 1 0 : 7 ^ - h ^ Isaacs-Kidd FfJJB :^y h^

3i/t'J:tt:'«i/)^©y«Ci m^mmvtzBi

1«H) « l

0 Bf : 1969 ^ 1 i i 21 0 , 10~H ^ .

« S © « f f : ^ ° - •I' x |g: |ba5-m. mK 47° S,

75° W # f i .

mmmm (Fig. i © st. i) onm: 7j<iB» 150 m, Jg® i>|B, ^(i|7j<S 13.5"

c, mmyKU re,

^ ^ : ^ « D, a s 13.5°C, a a NNW 6 m.

*#?.{i*IISiii?>2:©«5tAofcm{t, ^B±10 ^^HSiyfc. ^©6Ma#irfeT% t n a 1968 12 ilt^l^bW^^l^"© Lobos de Afera ft#fiT'«S

Lfc Copepoda ^^t'©/|NSyi?«a{<:J; 5l£^/j:»ffl

t ' -©gg i¥r j ;s l>©T ' *o f : . ^UT^:nP)©/> J f t tE 'MK 10 cm~l m 0t^-jU'^OMUMm^^^

K7Km±^mfy7yi7m%bxi^fz. coio^immm itmm^m^xmKm^xh-ofz. r^^. £^±©.±5 rmMii Fig. 1 © St. 1 (hP-ji^SS*^) f S

228 •^^

3.2 y >;; h JJir^Ml>/:• t^6i)>, J^ > v-> ^ ^ z k

OmyK^ (Kingstone valve) i^^OMB^^^M

3 ->;t 'J :t If-^ MwmWG © t ) ^ . ^ " * S t i ^ MMb

fZ (Fig. 2).

" o r K t © t t ^ © 5 5 - ^ « H * ^ S f ; J i > { j : Fig. 1 ©

« ^ © St. 2-^6 Itm^XmM^-^^:^ hi^XZ 2y y

h, 10dB©*liC^"l%fi^j:of:. ^0B^, St. 2

(21 H, 20.00~20.10) iJiCK St. 3(22 B, 00.30-

00.40) Kfc^^T 7 6 « # : t 33|H#:©I&^;6>|^«#ti

fZ. t.tZ St. 7 Itfe'l-^Tfj^cC-ofc Isaacs-Kidd Ff S

^.-;. h (22 H, 09.12'-09.32 ; 50^-60 m Ji) K^-o

xiimi^o^^i)m^ntzr^, st. 4'-6}c:fai T

-<:^^^mKi6lfZ h D - ; ^ « a C F i g . l 0 S t . 1)

i<: i : -oT^i .5 h > . l 3 a © 3 f e S * > * » $ t i f c . C

l i ?) © ohi)>h ^M ^titz i^-^if^yt Brama rail

(Bloch), V 3 ^'y^O Macruronus magellanicus

LOnnberg^20'fB#,^ ti ^^f-jj-?X^Thyrsitesatun

(Euphrasen) 2mw-^M/vxnnmmM&^sfim , a iyt 'J ^ t:'Miil^©S||ttS^M^fC (Table I).

'SOUTH AMERICA

St. 7

-47-S-Q

TT / lOO {Mho

^^ms

78'W JJ_

Fig. 1. Map of Penas Bay and its adjacent, south Chile, especially showing the observed location and the distribution of the larva. St. 1, trawl ground; St. 2-6, stations of fish-larva net; St, 7, station of Isaacs-Kidd net. Solid circle, present; open circle, absent.

Table 1. Stomach contents of three fishes caught in Penas Bay.

Examined fish (Body length)

Brama rati (Bloch) (36—55 cm)

Macruronus magellanicus LSnnberg

(23—51 cm)

Thyrsites atun (Euphrasen)

(34, 45 cm)

No. of ex­amined

individuals

20

20

2

Food organisms

Munida gregaria (Crustacea) Hyperiidae ( / / ) Euphausiacea ( ' / ) Stomatopoda larva (// ) Myctophidae (Pisces)

Hyperiidae (Crustacea) Stomatopoda larva ( ' / ) Macruronus magellanicus (Pisces) Penaeidea or Caridea (Crustacea) Euphausiacea ( / / )

Digested fish

No. of fish eating each

food organism

16 7

12 8 1

20 7 3 1 1

2

No. of total food

organisms

583 237 170 152

1

805 17 6 1 1

2

:%: 9 'J CD -^ :=• + X ?g iC :te y- 5 =1 -> : t 'J j : - t ' ® O ^ I ^ i C O V ^ T 229

^ y V ? S Hyperiidae :6>^S5:i'£&, ^ P ^ 5^:^-7

4-[lIil^ § n/: : :! v' :t y J:- t"M Munida f i S | ^ ^

|^0^/C^:g*> 6.0~9.4mm (^:^ 7.2 mm, 20 j@#:

L/TB:^{J100^T!/^5 (Fig. 2). Third maxilliped

(icJ:<?l:lL, -?•© Terminal segments a ^ t ^ T '

Matthews ?> CD Munida gregaria CD Grimothea

|tg (post larval stage) (D^^O^fltX < —l$ t"

M|{^*5(tS|3^{i^V^Oj; 5-^-^5.1) Rayner KX

#i£f?:fc'pT«,it lyT 200m omuux ^m^^Y^

--^;^if#fii^'(i?fra/:tt"t^-^x<, Fig. i © St. 3

(47° S, 77°W;7ic^|^ 2000 m) # f i { ^ ^ T ' ^ ^ ^ U

TOf;. L(D^ iyt y i f'SCD5^I^W*fi^i hX'B

nhomw. (Fig. 1 © St. i~7) \±m^%omn-

c©i!]^{im^, ^ ^ ® © | g | 4 t UT ^ aST-/.^'

^ ^ - -:> 7 > K #iS}^ *50Ta c ©iij ;6> ^ ^ - r 5

i , ^07J<:^0*^!^S:t®©Mjbm><^iti^*>m,

^/TiSiO^n^..^' ^[I!©tl^-t^-{i'>v:^-^y;t(i:C

it^-XB.OX^W-'^O Lower California -f^g}^

fc'l"»T}i,3l]S©^ i/:t y t" Pleuroncodesplanipes

Stimpson (D^KW:^^ {^tH Lobster krill tug^ff

t l 5 cli;6>*5^'^0 {ZlJl-OTia® Suction valve ;6>

m-biUZCttiS^Z,.'^ mn%\t M. gregaria 0ib

^fclcioTMiiDti^ Kingstone valve ^mi>tl, C

(Dm\^x ^-Wifmvti 3 0© h o - y b ^ H ^ mte:

ifJ^$"5%f#/j::i>ofc. ViJlaneuva S^KlUlf^

S^{c:, C©if5Sf^oc^T^^©a^^^; l f ) t i / :

mtz. ^fz,m~MmM.(DB:^m^7Kmm^m7iimiEm S'g, m^m7Kmm%m/hm-^^'^ty h amu^x t'

Fig. 2. Swimming post larva of Munida gregaria (Fabri-cius), 8.0 mm in carapace length.

X m 1) Matthews, L. H. : Discovery Rep., 5, 467-

230 ^ ^ * l IS ^ 2 4 ^ ^ 4 #

484 (1932), culture and Forestry, Japan, Tokyo (1969). 2) U^%.X:Z>^MM(DmP(, pp .136 . mM&i 5) Loughrst , A. R. : Calif. Coop. Ocean. Fish.

^0T . MM (1962). Invest. Rep., 11, 142-154 (1967). 3) Rayner, G. W. : Discovery Rep., 10, 209- 6) Thomson. G. M. : T r a n s . N. Z. Inst. , 45,

245 (1935). 225-251 (1913). 4) Fisheries Agency: Rep. Sci. Exped. Fish. 7) Schmitt, W. L. : Crustaceans, pp. 204,

Chile, 1969 (Emerald Operation on Board Univ. of Michigan Press , Ann Arbor of Kaiyo-maru) , pp. 134, Ministry of Agri- (1965).

Summary

During the voyage of exploration of t rawl fishing ground off the Pacific coast of South America by R. V. Kaiyo-maru, Fisheries Agency, the authors observed the mass occurrence of the Munida larva which was known as " Lobster kr i l l" , an important whale food, in Peiias Bay of south Chile, on January 21, 1969 (Fig. 1). The swarm of the larva made our vessel stop by blocking the Kingstone valve on the way of t rawl operation. The observations were summarized as fol lows:

1) The most prominent swarming of the larva was observed in the northern waters of the bay, especially around the station of 47° S. and 75° W, (St. 1 in Fig. 1). The swarming area extended to the course of over 8 miles.

2) According to the survey of fish-larva and Isaacs-Kidd nets, the larvae were found even in the open sea (Fig. 1). These were considered being swept away from the bay.

3) Brama raii was recognized to take exclusively the larva as food, but in Macruronus magellanicus the authors could not find a trace of Munida in their stomachs (Table 1).

4) The larvae which measured 6.0-9.4 mm in carapace length except rostrum were revealed to belong to the Grimothea stage (post larval s tage) of Munida gregaria (Fabr ic ius) (Fig. 2).

Contribution from Emerald Operation (Scientific Expedition on Fishes off Peru and Chile by Kaiyo-maru, Fisheries Agency).

Osame T a b e t a : Fisheries Laboratory, Faculty of Agriculture, Kyushu University, Fukuoka, Japan.

Shin-ichi Kanamaru : Hokkaido Regional Fisheries Research Laboratory, Hokkaido, Japan.