Bettas4all Standard: Chapter 3G - Halfmoon

[Roberto Silverii]

Chapter 3G: Finnage Characteristics - Halfmoon


By Joep van Esch
www.bettas4all.nl - The International Betta Forum



Figure 3G.1   2D representation of the 3D model of the ideal halfmoon (created by Stefan George Psarakos).


1. General appearance


1.1 Condition
As in all other show betta (see Chapter 3).


1.2 Deportment
As in all other show betta (see Chapter 3).


1.3 Overall balance
The ideal halfmoon has a symmetrical appearance which can be demonstrated by an imaginary horizontal midline which shows that the upper and lower parts of the fish nearly form a mirror-image (see Figure 3G.2). The contour of the ideal halfmoon fits an oval of which the width is approximately 1.2-times the height. The outer rim of the unpaired fins follows the contours of the oval in a smooth way without any irregularities. Ideally the anal fin and dorsal fin should not extend beyond the bottom edge and upper edge of the caudal fin, respectively.



Figure 3G.2    The contour of the ideal halfmoon fits an oval. The horizontal (X) and vertical (Y) midlines as well as vertical lines A-E are used to describe the proportions of the ideal halfmoon.
   
The vertical line which runs through the point on the body where the outer rays of the caudal fin are attached (C), divides the total length of the halfmoon (A-E) into two parts, A-C and C-E, with a ~60/40 distribution respectively (see Figure 3G.2).


An important point with respect to overall balance is the fact that the finnage has to be in proportion with the body. The width of the anal fin (B-C) is used as an important marker to indicate the desired proportions (see Figure 3G.3). In the ideal situation the length of the rays of the caudal fin, which extend from the peduncle (D) to the outer rim (E), are equal to the width of the anal fin (B-C). When an imaginary vertical midline would be drawn, the vertical length of the dorsal and anal fin from the body to the outer rim is again equal to the width of the anal fin. The length of the ventral fins from the point where they are attached to the body to the tip is equal to 5/6 of the width of the anal fin (B-C).



Figure 3G.3    The width of the anal fin (B-C) is an important marker to demonstrate proportion.


2. Body


2.1 Form & dimension
As in all other show betta (see Chapter 3 and Figure 3G.4).



Figure 3G.4    Ideal body shape form & dimension of the halfmoon.


2.2. Scalation
As in all other show betta (see Chapter 3).


3. Finnage


3.1 Caudal fin
The form of the caudal fin of the halfmoon can be compared with a the shape of a capital letter "D" (see Figure 3G.5, left). The caudal fin has a symmetrical appearance which means that it could be divided into two equal parts which are a mirror-images of each other across a horizontal midline (X). The ideal caudal fin has a 180-degree spread, straight rays and sharp corners. A spread of more than 180-degrees is not  preferred over a 180-degree spread. The caudal fin has 12-13 primary rays which extend from the peduncle and ideally the branching of the rays can range from secondary (4-ray) to quaternary (16-ray) branching. The branching of the rays should be evenly distributed throughout the caudal fin. The webbing of the caudal fin has a smooth appearance without any overlapping/folding parts due to excessive branching and/or webbing.



Figure 3G.5   Ideal form of the caudal fin (left) and dorsal fin (right) of the halfmoon.


3.2 Dorsal fin
The dorsal fin of the halfmoon snaps open like a fan and has the shape of a modified scalene trapezoid (see Figure 3G.5, right). The volume and the capacity of the dorsal fin to open up like a fan is achieved by an increase in branching of the rays (mostly secondary or tertiary branching) and possibly an slight increase of rays (ranging from 9 to 14 rays). Ideally the base of the dorsal fin should be equal to 2/3 of the width of the anal fin (B-C). The rays in the back of the dorsal fin match those of the caudal fin but the length of the rays slightly declines towards the front. The rays in the front of the dorsal must be slightly directed forward, and the back of the dorsal fin overlaps the upper part of the caudal. Overlap of the back of the dorsal fin with the body is not desirable. The webbing of the dorsal fin has a smooth appearance without any overlapping/folding parts due to excessive branching and/or webbing.


3.3 Anal fin
The anal fin of the halfmoon starts at the thickest point of the body (B) and has the shape of a modified scalene trapezium (see Figure 3G.6, right). The anal fin runs approximately parallel to the body. The length of the rays in the back of the anal fin match those of the caudal fin but the length of the rays slightly declines towards the front. During flaring the front of the anal is directed forward  and the back overlaps the lower part of the caudal.  The volume and the capacity of the anal fin to open up during flaring is achieved by a moderate branching of the fin-rays (mainly primary raysplitting although secondary raysplitting sometimes also can be observed). The webbing of the anal fin has a smooth appearance without any overlapping/folding parts due to excessive branching and/or webbing.


3.4 Ventral fins
The form of the ventrals fins of a halfmoon is as in all other show betta (see Chapter 3). Additionally, the ventrals of the halfmoon should have a full volume (see Figure 3G.6, left).


3.5 Pectoral fins
As in all other show betta (see Chapter 3 and Figure 3G.6, right).



Figure 3G.6   Ideal form of the ventral & pectoral fins (left) and anal fin (right) of the halfmoon.



Figure 3G.7   Examples of Halfmoon males
(A) was bred by Kit Watchara (Aquastar71; Thailand), (B) was bred by Wasan Sattayapun (Wasanbetta; Thailand) and (C) was bred by Sawanit Youchongdee (Kaimook15; Thailand)
Please note that these fish are examples and still exhibit points requiring improvement.


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