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THA/75/012/WP 21 LENGTH-WEIGHT RELATIONSHIPS OF CULTURED AND WILD Clarias batrachus in Thailand |
by
Vijai Srisuwantach and Dhana Yingcharoen
Programme for the Development of Pond Management Techniques
and Disease Control (DoF - UNDP/FAO THA/75/012)
Thailand
National Inland Fisheries Institute
Bangkok, Thailand
1981
The “Programme for the Development of Pond Management Techniques and Disease Control (THA/75/012) was implemented in Thailand during 1979–82 as a joint project by the Department of Fisheries (DoF) and UNDP/FAO. The purpose of the project was to improve DoF support services for Clarias farming through strengthening:
the skills of Fisheries staff in aquaculture disciplines such as disease diagnosis and treatment, pond management and extension,
the research on solutions for problematical aspects of Clarias culture,
the system of relaying problems from the farms to DoF and of transferring improved technologies, and
the equipment and facility base of DoF for working on aquaculture problems.
Although the UNDP/FAO participation was structured terminate in August 1981, DoF committed continuation of the project to at least August 1982.
This report is one of several Working Papers prepared on various aspects of the project. A list of titles of reports completed in the series is annexed.
Inquiries concerning the subject matter of any particular report should be directed to the author,
c/o | The Director National Inland Fisheries Institute Kasetsart University Campus Bangkhen, Bangkok 9 Thailand |
Hyperlinks to non-FAO Internet sites do not imply any official endorsement of or responsibility for the opinions, ideas, data or products presented at these locations, or guarantee the validity of the information provided. The sole purpose of links to non-FAO sites is to indicate further information available on related topics.
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List of Figures:
1. Length-weight relationship of wild Clarias batrachus (after Sidthimunka 1973)
2. Length-weight relationship of cultured Clarias batrachus (after Srisuwantach et. al., 1980)
List of Tables:
Length-weight Relationships of Cultured and Wild Clarias batrachus in Thailand1
Vijai Srisuwantach2 and Dhana Yingcharoen3
Numerical relationships between length and weight along with condition indices were determined for both wild and cultivated Clarias batrachus in Thailand. The primary data were obtained from pre-existing studies on wild fish by Sidthimunka (1973) and on farmed fish by Srisuwantach, et. al. (1980).
Length-weight relationships were determined by the following equation:
log10W | = | log10a + b log10 L |
where | ||
W | = | weight in grams |
L | = | total length in centimeters |
b | = | exponent (slope). |
Calculation of the relative condition index (Kn), the ratio of observed weight (W) of fish of a certain length to the calculated or expected weight (W) of fish that long, followed the formula of Le Cren (1951):
3 Fisheries Biologist, Mahasarakam Fisheries Station, Amphoe Muang, Mahasarakam Province, Thailand.
Primary measurements were made on wild fish ranging from 7 to 34 cm., and on farmed fish from 5 to 28 cm., in length. In both cases data were grouped in correspondence with one centimeter length classes of the fish.
Regression analyses resulted in the equations
log W | = | -2.2907 + 3.1202 log L (wild fish) |
and | ||
log W | = | -2.1692 + 3.0857 log L (cultured fish) |
illustrated in Figures 1 and 2, respectively. The computation of expected
or standardized weights (), as shown in Tables 1 and 2, was based upon the
above equations.
A comparison of the observed weights of farmed fish with standard weights of wild fish shows that cultured Clarias weight an average of about 19% more than their wild counterparts (Table 3).
Le Gren, E.D. 1951. The length-weight relationship and seasonal cycle in gonad weight and condition in perch, Perca fluviatilis. J. Anim. Ecol., 20: 201–219.
Sidthimunka, A. 1973. Length-weight relationships of freshwater fishes of Thailand. International Center for Aquaculture Research and Development, Series No. 3, Auburn University, 25p.
Srisuwantach, V.R. Soungchomphan, and P. Sae-Eng. 1980. Water quality conditions as disease related stressors in Clarias ponds. Ecology Technical Paper No. 3. Ecology Unit, National Inland Fisheries Institute, Bangkok, Thailand. 33p.
Figure 1. Length-weight relationship of wild Clarias batrachus (after Sidthimunka 19873).
Figure 2. Length-weight relationship of cultured Clarias batrachus (Srisuwantach et. al. 1980)
Table 1. Length-weight relationships in centimeters and grams of wild Clarias batrachus (after Sidthimunka 1973).
Total length (cm) | No. of fish | Range in weight (gm) | Average
empirical weight (gm) | Calculated standard weights (gm) | Kn | |
minimum | maximum | |||||
7 | 1 | 2.0 | 2.0 | 2.0 | 2.22 | 0.90 |
8 | 2 | 2.0 | 3.0 | 2.5 | 3.37 | 0.74 |
9 | 1 | 5.0 | 5.0 | 5.0 | 4.86 | 1.02 |
10 | 3 | 5.0 | 11.0 | 8.0 | 6.75 | 1.18 |
11 | 2 | 8.0 | 10.0 | 9.0 | 9.09 | 0.99 |
12 | 1 | 12.0 | 12.0 | 12.0 | 11.93 | 1.01 |
13 | 2 | 14.0 | 23.0 | 18.5 | 15.31 | 1.21 |
14 | 5 | 15.0 | 20.0 | 17.8 | 19.29 | 0.92 |
15 | 4 | 24.0 | 30.0 | 26.0 | 23.93 | 1.09 |
16 | 11 | 18.0 | 39.0 | 31.0 | 29.27 | 1.06 |
17 | 6 | 31.0 | 37.0 | 35.0 | 35.36 | 0.99 |
18 | 3 | 41.0 | 46.0 | 43.0 | 42.27 | 1.02 |
19 | 6 | 42.0 | 60.0 | 52.2 | 50.03 | 1.04 |
20 | 2 | 52.0 | 54.0 | 53.0 | 58.72 | 0.90 |
21 | 3 | 75.0 | 100.0 | 85.0 | 68.37 | 1.24 |
23 | 9 | 85.0 | 115.0 | 99.2 | 90.82 | 1.09 |
24 | 6 | 90.0 | 110.0 | 100.8 | 103.7 | 0.97 |
25 | 9 | 95.0 | 160.0 | 126.1 | 117.9 | 1.07 |
26 | 13 | 120.0 | 180.0 | 140.8 | 133.1 | 1.06 |
27 | 8 | 140.0 | 210.0 | 162.4 | 149.7 | 0.97 |
28 | 8 | 140.0 | 210.0 | 162.4 | 167.8 | 0.97 |
29 | 3 | 175.0 | 210.0 | 193.3 | 187.2 | 1.03 |
30 | 2 | 170.0 | 195.0 | 182.5 | 208.1 | 0.88 |
31 | 2 | 205.0 | 215.0 | 210.0 | 230.4 | 0.91 |
34 | 1 | 240.0 | 240.0 | 240.0 | 307.5 | 0.78 |
Table 2. Length-weight relationships in centimeters and grams of farmed Clarias batrachus (Srisawantach et. al. 1980)
Total length (cm) | No. of fish | Range in weight (gm) | Average empirical weight (gm) | Calculated standard weights (gm) | Kn | |
minimum | maximum | |||||
5 | 5 | 1 | 1 | 1 | 0.97 | 1.03 |
6 | 3 | 2 | 2 | 2 | 1.71 | 1.17 |
7 | 10 | 1 | 3 | 2.3 | 2.74 | 0.84 |
8 | 19 | 1 | 6 | 3.9 | 4.14 | 0.94 |
9 | 19 | 4 | 8 | 5.8 | 5.96 | 0.97 |
10 | 26 | 4 | 13 | 8.0 | 8.25 | 0.97 |
11 | 22 | 4 | 16 | 10.2 | 11.08 | 0.92 |
12 | 27 | 10 | 20 | 14.6 | 14.48 | 1.00 |
13 | 25 | 14 | 24 | 20.2 | 18.54 | 1.09 |
14 | 27 | 18 | 32 | 24.6 | 23.30 | 1.06 |
15 | 31 | 22 | 36 | 29.1 | 28.83 | 1.01 |
16 | 38 | 22 | 43 | 35.7 | 35.18 | 1.01 |
17 | 37 | 34 | 52 | 41.9 | 42.40 | 0.99 |
18 | 42 | 44 | 62 | 51.9 | 50.6 | 1.03 |
19 | 48 | 48 | 80 | 61.8 | 59.81 | 1.03 |
20 | 45 | 42 | 86 | 70.1 | 70.03 | 1.00 |
21 | 54 | 68 | 112 | 84.4 | 81.41 | 1.04 |
22 | 34 | 84 | 116 | 98.2 | 93.97 | 1.05 |
23 | 32 | 92 | 128 | 110.5 | 107.7 | 1.03 |
24 | 12 | 106 | 150 | 124.5 | 122.9 | 1.01 |
25 | 8 | 122 | 152 | 135.3 | 139.4 | 0.97 |
26 | 6 | 144 | 166 | 157.7 | 157.4 | 1.00 |
28 | 2 | 168 | 184 | 176 | 197.9 | 0.89 |
Table 3. Relative condition index of farmed Clarias batrachus based on comparison of observed weights of cultured fish and standard weights of wild fish.
Total length (cm) | Empirical weight of cultured fish (gm) | Standardized weights, wild fish (gm) | Kn |
7 | 2.3 | 2.2 | 1.05 |
8 | 3.9 | 3.4 | 1.15 |
9 | 5.8 | 4.9 | 1.18 |
10 | 8.0 | 6.8 | 1.18 |
11 | 10.2 | 9.09 | 1.12 |
12 | 14.6 | 11.9 | 1.23 |
13 | 20.2 | 15.3 | 1.32 |
14 | 24.6 | 19.3 | 1.27 |
15 | 29.1 | 23.9 | 1.22 |
16 | 35.7 | 29.3 | 1.22 |
17 | 41.9 | 35.4 | 1.18 |
18 | 51.9 | 42.3 | 1.21 |
19 | 61.8 | 50.0 | 1.24 |
20 | 70.1 | 58.7 | 1.19 |
21 | 84.4 | 68.4 | 1.23 |
23 | 110.5 | 90.8 | 1.22 |
24 | 124.5 | 103.7 | 1.20 |
25 | 135.3 | 117.9 | 1.15 |
26 | 157.7 | 133.1 | 1.18 |
28 | 176.0 | 167.8 | 1.05 |
The Programme for the Development of Pond Management
Techniques and Disease Control
(DoF-UNDP/FAO THA/75/012)
Reports
THA/75/012/WP 1 | Report on Aquaculture Training Undertaken at the International Center for Aquaculture, Auburn University, U.S.A. Chanchai Sansrimahachai |
THA/75/012/WP 2 | Third Semi-Annual Report (Sept. 1/80-Feb. 28/81) of Progress on the “Programme for the Development of Pond Management echniques and Disease Control (DoF-UNDP/FAO THA/75/012)”. Alex N. Fedoruk |
THA/75/012/WP 3 | Management in Clarias Culture, Thailand. James Muir |
THA/75/012/WP 4 | Collecting Clarias Fry from Natural Waters. Montree Muangboon |
THA/75/012/WP 5 | Preliminary List of Diseases of Cultured Clarias in Thailand. National Inland Fisheries Institute, Thailand and Institute of Aquaculture, Stirling, Scotland. |
THA/75/012/WP 6 | Electrophoretic Analysis of Tilapia from the Dusit Palace Stock, Thailand. Brendan McAndrew |
THA/75/012/WP 7 | Water Quality Conditions as Disease Related Stressors inClarias Pond Culture. Vijai Srisuwantach, Rangsarn Soungchomphan and Pathipath Sae-Eng. |
THA/75/012/WP 8 | Analysis of NIFI Clarias Diet No. 12. Albert J. Tacon and M. Beveridge |
THA/75/012/WP 9 | Summary of the Report “Raising Clarias Fry on an Artificial Diet”. Prasert Sitasit and Alex Fedoruk |
THA/75/012/WP 10 | A Management Perspective on Stress and Infectious Diseases in Clarias Farming. Alex N. Fedoruk |
THA/75/012/WP 11 | Feeds for Catfish (Clarias batrachus Linn.) Fry. Samran Dhamrongrat and Prasit Kasesuchi |
THA/75/012/WP 12 | Assessment of a Vitamin Mineral Premix in an Artificial Feed for Pla Duk Oui (Clarias macrocephalus) Fry. Krittiya Taechajanta and Prasert Sitasit |
THA/75/012/WP 13 | Management and Research Approaches in Clarias Culture, Thailand. B. Hepher |
THA/75/012/WP 14 | Synopsis of the Report “Production Costs and Incomes in Clarias Pond Culture, Bang Pla Ma District, Suphanburi Province”. Vanich Varikul and Alex Fedoruk |
THA/75/012/WP 15 | Comparison of the Effects of Trash Fish and Pelleted Diets in Clarias Grow-out Operations. Vijai Srisuwantach, Rangsarn Soungchomphan and Prasert Sitasit |
THA/75/012/WP 16 | Water Conditions as Limiting Factors in Clarias Culture. John A. Colman and S. Chinabut |
THA/75/012/WP 17 | A Bibliography of Clarias (Family Clariidae) in Thailand. Alex Fedoruk and Kamolphorn Pawaputanon |
THA/75/012/WP 18 | Snakehead (Channa Striatus) Farming in Thailand. Kok Leong Wee |
THA/75/012/WP 19 | Assessment of the Program for the UNDP/FAO Supported Catfish Project in Thailand. Ronald J. Roberts. |
THA/75/012/WP 20 | Selected Clarias Bibliography from Countries Other than Thailand. Wantanee Kate-Pasook and Alex N. Fedoruk |