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Standard Length (SL - mm)

82.5 - 155.8

117.6

25.8

107.8

Height (%SL)

45.3 - 51.6

48.4

1.8

50.8

Head Length (%SL)

22.9 - 27.3

24.5

1.4

26.3

Eye Diameter (%SL)

4.6 - 7.4

5.8

1.2

6.0

Upper Maxilla (%SL)

8.3 - 13.5

10.3

1.9

10.5

Dorsal Fin Rays

77 - 84

80.6

2.5

74,0

Anal Fin Rays

60 - 63

61.3

1.0

57,0

Pectoral Fin Rays

10.0 - 11.0

10.8

0.3

10,0

Gill Rakers (Upper + Lower)

4 - 6 + 13 - 16

5.1 + 15.3

0.6 + 1.2

5 + 14

Lateral Line Scales

39 - 45

42.8

1.1

40.0

Reversal and ambicoloration in two flounder species.

25

Table I – Measurements and countings for ten typical Citharichthys macrops and one reversed specimen.

S.D. = Standard Deviation

4 - 6 + 12 - 16 37 - 44

Measurements and Countings

Typical C. macrops (n=10)

Range

Mean

SD

Reversed

- - - - - 74 - 85 56 - 64 -

Figueiredo & Menezes

(2000)

Table II shows that neither ambicolored P. isosceles demonstrated morphological differences in relation to the normal ones. Both morphometric and meristic mean values fall within the species´ range (Figueiredo & Menezes 2000), as in the

Northwestern (e.g. Hussakof 1914, Gudger 1935, Gudger 1936) and Southwestern Atlantic (e.g. Díaz de Astarloa 1994, Díaz de Astarloa 1998, Carnikián et al. 2006), including a report for P. isosceles in the Southwestern Atlantic (Díaz de Astarloa 1998).

reversed C. macrops.

However, the ambicolored specimens described in

Ambicoloration is particularly

Paralichthys,

with

reported

cases

common in

for

both

this paper are the first record for the species in Brazilian waters.

Range

Mean

S. D.

Range

Mean

S. D.

Menezes (2000)

125.6 - 189.3

141.9

19.3

98.8 - 220.0

159.4

19.3

-

43.2 - 46.2

44.6

1

42.8 - 45.2

44.0

1

-

27.4 - 29.1

28.2

0.7

27.5 - 27.8

27.7

0.7

-

5.8 - 7.4

6.6

0.5

6.0 - 6.8

6.4

0.5

-

3.8 - 4.7

4.3

0.3

4.1 - 4.6

4.3

0.4

3.7 - 4.8

83 - 87

86

1.6

86 - 87

86.5

0.7

79 - 92

67 - 73

69

1.7

67 - 68

67.5

0.7

67 - 72

11 - 12

11

0.5

11

11

0

-

9 - 12 + 2 - 4

9.7 + 2.8

0.9 + 0.6

9 - 10 + 3

9.5 + 3

0.7 + 0

9 - 11 + 2 - 3

47 - 52

50

1.3

50

50

0

46 - 52

Figueiredo &

Studies about pigmentation defects of flatfishes have been carried out for over a hundred years, but the causes of abnormalities

morphological or meristic parameters were altered in either flounder species. Aknowledgements The authors would like to thank José Lima Figueiredo for receiving the voucher specimens and Demarques Ribeiro Silva Junior for the photos.

References Bolker, J. A., Hakala, T. F. & Quist, J. E. 2005.

Pigmentation

development,

defects,

and

patterning in summer flounder (Paralichthys dentatus). Zoology, 108: 183-193. Carnikián, A., Acuña, A. & Viana, F. 2006.

  • S.

    D. = Standard Deviation

    • *

      - Series of scales above the straight portion of the Lateral Line

neurological aspects are accountable for these phenomena, for fishes in captivity (Venizelos & Benetti 1999). The present study does not intend to discuss the causes of these abnormalities, but only to single out the fact that such malformations are registered in Ilha Grande Bay and

no

Table II – Measurements and countings for regular and ambicolored Paralichthys isosceles.

differences,

still can’t

be

pinpointed.

environmental,

nutritional,

A number

of

hormonal

and

Measurements and Countings

Standard Length (SL - mm) Height (%SL) Head Length (HL) (%SL) Eye Diameter (ED) (%SL)

Typical P. isosceles (n=11)

Reversed P. isosceles (n=2)

Guanabara Bay. Despite

coloration

+

HL/ED Dorsal Fin Rays Anal Fin Rays Pectoral Fin Rays

Gill Rakers (Low Rudimentary Upper) Lateral Line*

er

Pan-American Journal of Aquatic Sciences (2007), 2 (1): 23-26

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