The Effect of Fixation, Preservation and Freezing on Certain Body Proportions of Two Small Pelagic Fish Species, Sardinella Longiceps (Family: Clupeidae) and Selaroides Leptolepis Collected From Muscat Waters, Sultanate of Oman - page 2

Results and Discussion

The different concentrations of formaldehyde and ethanol besides freezing showed different degrees of effects on the three dimensions of the two fish species in question chosen for the study (Table 1 and 2).

 

Table 1: Effects of different fixatives, preservatives and freezing on selected morphological characters of Sardinella longiceps. DW, distilled water; HL, head length; I, increase; NE, no effect; SH, Shrinkage; SL, standard length; TL, total length; TW, tap water.

Morphological Characters

Fixatives, Preservatives, Freezing

% Effect

TL

10% Formaldehyde -TW

9.6

I

TL

10% Formaldehyde -DW

1.5

I

TL

5% Formaldehyde -TW

2.2

I

TL

5% Formaldehyde -DW

1.5

I

TL

70% Ethanol-TW

2.1

I

TL

70% Ethanol-DW

5.8

I

TL

Freezing

3.8

I

SL

10% Formaldehyde -TW

12.9

I

SL

10% Formaldehyde -DW

8.5

I

SL

5% Formaldehyde -TW

4.4

I

SL

5% Formaldehyde -DW

6.2 I

SL

70% Ethanol-TW

6.7 I

SL

70% Ethanol-DW

1.8 I

SL

Freezing

5.3 I

HL

10% Formaldehyde -TW

6.7

I

HL

10% Formaldehyde -DW

12.9 I

HL

5% Formaldehyde -TW

13.3 I

HL

5% Formaldehyde -DW

10.7 I

HL

70% Ethanol-TW

11.1 I

HL

70% Ethanol-DW

5.7 I

HL

Freezing

12.9 I

 

Table 2: The effects of different fixatives, preservatives and freezing on selected morphological characters of Selaroides leptolepis. DW, distilled water; HL, head length; I, increase; NE, no effect; SH, Shrinkage; SL, standard length; TL, total length; TW, tap water.

Morphological Characters

Fixatives, Preservatives, Freezing

% Effect

TL

10% Formaldehyde -TW

1.4

NE

TL

10% Formaldehyde -DW

0.8

NE

TL

5% Formaldehyde -TW

1.3

I

TL

5% Formaldehyde -DW

4.4

I

TL

70% Ethanol-TW

2.1

I

TL

70% Ethanol-DW

5.7

I

TL

Freezing

4.6

I

SL

10% Formaldehyde -TW

0.9

I

SL

10% Formaldehyde -DW

2.5

I

SL

5% Formaldehyde -TW

3.3

NE

SL

5% Formaldehyde -DW

2.2 I

SL

70% Ethanol-TW

6.7 SH

SL

70% Ethanol-DW

1.8 I

SL

Freezing

1.7 I

HL

10% Formaldehyde -TW

13.5

I

HL

10% Formaldehyde -DW

0 SH

HL

5% Formaldehyde -TW

4.4 SH

HL

5% Formaldehyde -DW

24.3 I

HL

70% Ethanol-TW

11.1 I

HL

70% Ethanol-DW

5.7 I

HL

Freezing

15.4 I