CalCOFI Reports, Vol. 27, 1986 - California Cooperative Oceanic ...

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MOSER ET AL.: EARLY STAGES OF OCEAN WHITEFISHCalCOFI Rep., Vol. XXVII, 1986Figure 2. Developmental stages of Caulolatilus princeps: (A) 6.2-mm larva, flexion stage; (€3)juvenile.6.2-mm larva, dorsal view; (C) 7.9-mm larva; (D) 16.8-mm pelagicI66
MOSER ET AL.: EARLY STAGES OF OCEAN WHITEFISHCalCOFI Rep., Vol. XXVII, 1986TABLE 4Meristics of Stained Specimens of Caulolatilus princepsPrincipal Procurrentcaudal caudal Branchio- PectoralAnal DorsalPelvicLength fin raysfin rays stegal rays fin raysfin finfin rays(mm) Superior Inferior Superior Inferior Left Right Left Right rays rays Left RightVertebrae5.7 (6) (6)6.1 (8) (7)- - 6 6 (7) (7) (1.12) (VIII,lO) - - 15- - 6 6 - (12) (1,17) (IX.17) - - 177.1 9 8 - - 6 6 12 12 11.22 IX,20 1,3 1,3 277.9 9 8 4 4 6 6 19 19 I1,25 IX,24 1,s 1.5 -15.5 9 8 13 11 6 6 19 19 II,25 IX,24 I,5 1.5 -16.8 9 8 11 11 6 6 18 18 11.24 IX,25 1,5 1,5 -17.1 9 8 12 12 6 6 19 19 11.25 IX,26 1.5 1,5 -38.6 9 8 13 12 6 6 19 19 11.25 IX,26 I,5 I, 5 -Specimens between dashed lines are undergoing notochord flexion. Numbers in parentheses indicate unstained fin elements.opercle, and the opercle has one. In pelagic juvenilesthe spines on the ridges become less prominent, but theridges increase in number as multiple ridges develop atthe supracleithral shelf, lacrimal, dentary, andpreopercular bones.In addition to head spines, larvae of C. princepsdevelop spinous scales on the head and body. Theseappear initially in flexion-stage larvae as patches ofsmall conical spines lacking the ossified scale. Flexionstagelarvae develop the following patches: (1) a linearpatch on each side of the nape, (2) a linear patch oneach side of the spinous dorsal fin, (3) a patch on theopercle, (4) one on the outer surface of the pectoral finbase, (5) one on the ventral midline posterior to theisthmus, (6) a rounded patch on the posteroventralsurface of the gut, (7) an elongate patch on the trunkextending posteriad along the midlateral region of thetail. All of these patches enlarge in postflexion larvae,and the supporting scales become ossified. The patchesat the nape and fin base enlarge to fill in the bodyregion above the lateral line; the trunk patch enlarges tofill in the area below the lateral line. The gut patch extendsanteriad and dorsad to cover the gut area, and theventral midline patch expands in a broad triangularshape to cover that region. A patch also forms on thecheek posterior to the eye.In early pelagic juveniles the entire body is coveredwith scales that have one to several spines located ontheir posterior regions. The head is also covered, ex-cept for the frontal ridge region and the ventral region.In late-stage pelagic juveniles each scale has typically4-6 spines in a cluster at the posterior central region ofthe scale.Fin FormationlMeristicsThe first elements to ossify are the branchiostegalrays at about 3.7 mm NL (Table 4). Specimens largerthan 5.0 mm NL have the full complement of 6branchiostegal rays. The sequence of initial ossificationof fin rays could not be determined because ofcalcium leaching during preservation; however, theappearance of unstained rays could be noted, and theseare indicated in Table 4. Principal caudal rays appear atabout 4.5 mm NL, and the full complement of 9 + 8rays is present in early preflexion larvae. Procurrentcaudal rays begin forming late in the postflexion stage;the full complement is formed in pelagic juveniles(Table 4). Dorsal and anal fin rays appear in 5-mmlarvae, and the full complements (D. VIII-IX, 23-26;A. 1-11, 23-25) are present in our largest larva (7.9 mmSL) .The pectoral fins have a large rounded base andblade in preflexion larvae. Rays begin to form in 5-mmlarvae and are fully formed by the end of the larvalperiod. The pelvic fins are the last to develop and arefully formed in postflexion larvae (Table 4). Vertebraebegin to ossify in 4-mm larvae; all centra (27) areossifying by the end of the notochord flexion.167
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REPORTSVOLUMECICTCIBERXXVll1986
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EDITOR Julie OlfeSPANISH EDITOR Pat
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COMMITTEE REPORTCalCOFI Rep., Vol.
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FISHERIES REVIEW: 1985CalCOFl Rep.,
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FISHERIES REVIEW: 1985CalCOFI Rep.,
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BINDMAN: 1985 NORTHERN ANCHOVY SPAW
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~~ ~BINDMAN: 1985 NORTHERN ANCHOVY
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WOLF AND SMITH: MAGNITUDE OF SARDIN
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PUBLICATIONSCalCOFI Rep., Vol. XXVI
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Part I1SYMPOSIUM OF THE CALCOFI CON
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PETERSEN ET AL.: NEARSHORE HYDROGRA
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LAVENBERG ET AL.: SOUTHERN CALIFORN
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STEPHENS ET AL.: LARVAL FISH RECRUI
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LOVE ET AL.: INSHORE SOFT SUBSTRATA
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Part 111SCIENTIFIC CONTRIBUTIONS
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BAILEY ET AL.: FORECASTING HAKE REC
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BAILEY ET AL.: FORECASTING HAKE REC
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ESPINO AND WOSNITZA-MENDO: PERUVIAN
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Page 144 and 145: DuracionQUINONEZ-VELAZQUEZ Y GOMEZ-
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Page 172 and 173: ARCOS AND FLEMINGER: CALANOID COPEP
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CHEN: VERTICAL DISTRIBUTION OF PELA
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BRINTON ET AL.: GULF OF CALIFORNIA
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METHOT: FRAME TRAWLCalCOFI Rep., Vo
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-130' 125. 120' 11.5. 110.I I I I I
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