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REF.J --

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',L.N. Domane,vsky'

,,'AtlantNIRO'

Kal:i.niD.gra~,

USSR

•

•

ON,'PE,CULIARITIES In THß BIOLOGY OF SOME. . ,....

LITTLE~KiroWN'FISHSPEeIES' FROMTllE NORTH­

WEST AFRICANCOAST

'In: this po.persomo biological characteri6,ti.CS~'~and'',.,. " .

, peculi~rities iri the di.stributio~ o'f such~pe,ci~s a's:"-: ': , t~

Polimetme co.rythac~laJ Hoplostethusmeditarraneus J ,Helic,olenus'. .. . '.. .. , ... ' . '... ~ .. .

dactylopterus t Berjx splendens t Boyx decadactylus ere :cons'idered.• ," • , :' • " < , ~ ",",,' -; ,: .~ :~'.. .~, "',' •

'The basicmaterinl vms collected dUring the expedition 6r the ",. , . ~..' '. - ,"\' , '~; -', .. '~ '$.~:,.,.~ ".

'AtiantNIRO R!V RThr' BELOGORSK in S~p'l;ember-November'1'972:,' ~ .".~ .. ' " '.. . -: . .~. .,'. ,,' ~-".: ... " :"" . "'. ,:.• '",:' :,. . , ;., ~ "

,off' the 'lTortl1':':'West Afr::i.ca· (r!g.1 ) ~ Thc series.of' 'hauls,by' a.... :'," ' .• ' '< "',, '", " ': '~'.', ,~ , ," ,,' .-~.. _-',~ -:".:~:,,,,,,,,.:.~.~' :~'".~'

.bottom trawl were 1ulfilled according to a previously'

coxistructed scheTlle 'eUCh 20 mil~s' at diffetent' d~Pth:~:,:'(t~.'600 ro).-' " ..... '" . ..

, • • f" '. _.... ~.

In sampling a routine method was used., The matUrit~1-:'stagesof".'" -' , ~ , ....

..:; . ".' . . , . , .. , . -" . ~ " , , .' -' "

'sexual products were determinod .by a six-grade scale.~ .' ~.

, Polimetinecorythacola{AJ.cock~: ·1898J(Gonostomidae) "

:BathypEü~gicschooling ..fish'occurringto -ihe;..nortb.,~of 2,4,ON:

'at' 'the ~epth'below ,)70 m (fig.1 );'abundant souihward'; ~f)O'~N':, :; '- .",' .' . "" " ... . ,,' . .' ~

'at "the 'depths of 450-525 m (fig. 2). It Vlas' also r'ecorded on 'tne

Concepcion Ba~lk. '

The' length rencheß 24 c~.- In the population the' females

predominnto" The males are less nUmerous und oi:· smäller, Biie~,," . :

Maximum len~th of males is ,16 cm.. The males are mature 'at the

I

A.~" _'_

length of 10-12 cm. whilefemalos at' 10-15 cm(tig.3J~: Immature'.- .. ".

. - ~ ':- ...

'Th.e:seXual' products were mainly in' matUl'ity .st'~g~ ·j;V.

(70~9o~'f~ 'in 'the' ~o;ther.n :~reäbe'ing':fO~d"~bout'20%':6~,spent'

, f~sh. Är~'un~ tho ·'c~pe J~bY .th~~p~Wning\~mS'';r~~otde~'~t~'~he .

'de~th- o'r":4oo~550 m;':wh~re' ru~~:ng -raDiales w~;~·C~~gh~ ," (st~geßIV-V aIid:v)~",:",,, ,;..'" ".~ .' ." " ,... ,' ,'.

", :'.' ',.;"-.., :,.-" ..

thosouth can oe found in great numbers~ . .' ""'

-r" " - 1-,,', , .. '

IIoptostethus mediterraneus C.V. (Trachichthydae,-•.. ; ;. '.. :. ':; -: - ~. :. . ,~BerYciformes) ~

'. ~. ..' ": . ~ . , .~,~'

. " ,:; ',"'

.'',Widely distributed' at the 'depths of 250"to 600 m' (fig.5)

.' . . ."

'(poesibly ,deeper) •. In. . . '~,

", ..

a:t- ,ieseer:,depths. :'"~'. ".,' ,

Though thc.: fieh or varia,uß ,lengt,h is found' nt different·,r.~,

depth~,it' sh'ould' be 'n~ted tho.t 'the 'larger individuals', tC'eep' :ta

" greate.r: deptho:(fig.6).·

•

~. ., ..

',' 'The length' reaches 26 em: (fig:'7). The s1ze of males and':.. .. . ;', " .. '

femaie'~' .is·· almost slmilar. :Thc sex' ratio 18 1 :i .' The '~~t~ation.... .~

. p'eriod i8 'prolonged'. '.The males ~ begin to' mature" at the· i~~gtli',~f. ~ . . . " .

,s,

·10:.em und, fomales at. 14 eDl•.Maturat:i.on·.is eomploted at' the <"

Most dep~eeonecnträtionswere reeorded to'the ßouth'of,. ~,' - " ~,. ';

26°n ,(fig.8). Size composition ~on'~idcrably differs by rirea~~'< • ,-'" • -', ..' '

: Small~f i~a~ure'fish ~s 'mor~.ribu~da~t in most :cases: Thc'. .' ..".,.'. , ' ~

producers '~~lere'predominant in :the"so~th.' : , -:'.>" ,'. ',':,':,'" ,j ' ... ,.':

.' " .·1 -'

. In 'Uovember-Decembcr thc scxuö.1 produetsin mature' :r:i.sh> •• .."••: ••" ,'. " • - -" ~ '" - ,.

weremainly in" stago IV.', The spawning oeeurs·in·'the· a~e~:~,'o'f~<';'

: Cap~" Ghir ~nd C~p:'.Blarie ,n~' \h~ d~Ptl1B,'O:f 380~625:m'~s'pav~i~

. -; '" " " .,'.

length.of 22 em..... '... ,... •

2

ti,sh was also: caug~t 'ind:iv:idually ,~t:J.esser' ~~pthso,~ :150-1G~.

, Bery:x: splenclenolowe' (BerYcidae, ,BerYcifoformes>:·. . ",". ~ ',' .~: ~ , ',,~ '"

,:# JIII." .,. ._.: :~ " .. " ..,

,'Recorded ir; twoareaS ,(fig.9) ."Most' numeroua to the south"'"- . .' ...

, - ~ ."' . '" , '.': "

p:E'25°N. Oc~urr~d at"depths ,from' 200't'o 550 m.(i'",.g~10) and:at:,'< ."..... • • _.' - ','

fosser:dei;ths southwardof, 25°N~. '

'Th~',f:tS~''öf'''21':25'\c~'';~ ~i~n~t;h:.pr-ed()minated (i-ig~1.1);-

se~i":produ~ts'~ ~o~e' iri:·ooturiti·'~t~ge ,'~Il' '.. .".. .

. Ber;vx decadäctylus Suoie~. :' ,;. ~ "' ,. - .:. '"" "* .. ';'" #

. . . "':. " - ..

Unlik:e,the'ebove species.this'fishwas recorded~only'.' - , - , . ...

~". '

. southwa;d Of 25;'N (f~g.9) >It also ';)ccurred in th~' ~atc.:hes.'. "

, ta~cen ,trom, the. Concepeion, Bank. Inhabits.,th'e depth. . .range,from'

'2'SO-SOOm. Less abundant as eompared with B4' "splendena The

,~'ittdhe~': i~eiud~'d' fish from 23' to43 cm'· (fig·.12)~· The'sextial

"~;~d~C't~':were:i~ maturity'st~ge'II:.""· " '" .," ~. ' ~. , "., , ...... ,. ~

H~l~colonus dactyloRterysi (nelaroch.e) (Scorpaenidae)

• ,Widely distributed. Thc Inrgest" coneent.ra:tion~'~;ecorded.

intheCap Blmic· aroa' (fig~13) .Occ~s 'at d~pt:hß" f~'Otn"10C/'t~ GeOm '

,: (P(;Soi'bl:i'd~~pE1r)~·in·the southern are'a keeps"t~'iesser"'dePtlis' .

,'if~g.14·).,'n~ "dependence of s~ze' upo~ depth :L~'m~rk~d~::'(~ig.15'L'.' .' .

. '- ,-'_:'-

Tho mnleci, begin to mature o.t ,'18 em'arid females' at 21 ·Ctn.· The

~~~~br~ti'on'is fully complotod' ~t 24"cm>The spaW~l1gwa~:. - . .' .

obsö'rved i:o- the Cap Blanc. area, at .th~.,'depth,o:f480-m.

3

-. ..

Fig.1 ~. The:opera~ional area of the .. A'tlantNIRO R/VRTM '

.' BELOGORSK in,·1972.·:

: Fig.2'- The occ~rence :at various"'depths .:on'.the.·North';;'Wost. . " ~ , ' ,"

African shelf.' .. '.\ .:

, " .... . .. ~.' .Fig.3. The length-sex8~ructureofP. corythacola., .

. ' .!" ••.••.~ ~ '"'". ~ . "~'. ...•/" .....,:~.~ ~ , .

.Fig.4. The distribution ~.and leng'thstructure, 01', P•. ,co!ythaco'la •. ·. ,... ,. - ~..: :.:..~: .. ' '.. ..

'. \' ' ••' • -';./ • 'y'~

Fig.5. The oc~urr~nce 01' Hoplostethus mcditerraneus at'·. ~ ~ .various depths 01' .the Nor·th-'!iest, ,African shel1'.·

, ...f .. :. ,~:.~

Fig.6. The distributionof H. mediterraneus of differentlength

(modal elnsaes) depending on the depth•. ,·

Fig.7. Tha length-~ex structure of ',Hoplostethus medlterraneus.,.,

" r

Fig.8 The siistribtrl'ion·. and length structureof H. mediterr~neu8~- .' ' .. ~. ,," . ;"':. . ,. . "

• <,'. " 1-

Fig.9. The ~istribution 01' B~ splendens and B. decadactylus(+)

onthe North-West African.shelf.

'.

.. Pig.11 •. The length structure of ·.Bery:x: splendens.

Pig.10. 'rhe distributionof:B. splendens·at various depthsof thJ

1 llorth~West African.· she11'•.

•

j

~ig.12 •. The length structure'of Beryx decadaotylus~'. " ...: ,.

. Fig.13.The 'distribution end length atructure.of H.· dactylopterys~

~iS•. 14~\ Th~ 'dist'~ibut~'on of 'H.· d~<ctYlo~t~;Ys··. at' ,~ario~~'tiep~hs ....:..;.,•• ',' .'. '''cl.'.~;~'. ..:~.~ .' ' .• ~ ~ .• -

~f 'tho U()rth-We~t Africu~'·~h·elf. J-"-

'Fig. 15. T'hff: distribution cf H. dac.tylopterUs ..,01' 'di:rferent':,r'ength .J.' '" " .:\ . :. .. ' , " ". '. ',' . ' .. ~ ." .,(modal class )d~pend~ng.. on ,.the depth~

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