AI SearchHybrid Clarias catfish seed production and marketing in central Thailand and experimental testing of seed quality (Record no. 56683)
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| 000 -LEADER | |
|---|---|
| fixed length control field | 05901cas|a2200421 i 4500 |
| 005 - DATE AND TIME OF LATEST TRANSACTION | |
| control field | 20260818133954.0 |
| 008 - FIXED-LENGTH DATA ELEMENTS--GENERAL INFORMATION | |
| fixed length control field | 020998s1997 th uzm rtt 00| a1eng d |
| 035 ## - SYSTEM CONTROL NUMBER | |
| System control number | .b11723373 |
| 099 #9 - LOCAL FREE-TEXT CALL NUMBER (OCLC) | |
| Classification number | AIT Diss. no. AS-97-06 |
| 100 0# - MAIN ENTRY--PERSONAL NAME | |
| Personal name | Suchart Ingthamjitr |
| 245 10 - TITLE STATEMENT | |
| Title | Hybrid Clarias catfish seed production and marketing in central Thailand and experimental testing of seed quality |
| 260 ## - PUBLICATION, DISTRIBUTION, ETC. | |
| Place of publication, distribution, etc. | Bangkok : |
| Name of publisher, distributor, etc. | Asian Institute of Technology, |
| Date of publication, distribution, etc. | 1997 |
| 300 ## - PHYSICAL DESCRIPTION | |
| Extent | 135 leaves |
| 490 1# - SERIES STATEMENT | |
| Series statement | Dissertation ; |
| Volume/sequential designation | no. AS-97-06 |
| 502 ## - DISSERTATION NOTE | |
| Dissertation note | Thesis (Ph.D.) - Asian Institute of Technology, 1997 |
| 500 ## - GENERAL NOTE | |
| General note | A dissertation submitted in partial fulfillment of the requirements for the degree of Doctor of Technical Science, School of Environment, Resources and Development |
| 520 ## - SUMMARY, ETC. | |
| Summary, etc. | Hybrid CIarr'as cat{uFB01}sh (CIan'as macrocephabrs x C [arias garieprrms) is a cultured {uFB01}sh of major economic importance in Thailand. Culture of Thai native cat{uFB01}sh became established over 30 years ago, but introduction of the hybrid in the late 1980's revolutionized the scale and importance of the industry. Recently, farmers raising the hybrid cat{uFB01}sh have been faced with slow growth and poor survival of their stocked {uFB01}sh, in addition to high competition and low pro{uFB01}t margins. Initial surveys traced some of these problems to hatchery practices and led to a research framework to analyze the technical and economic status of cat{uFB01}sh hatcheries. The study focused on cat{uFB01}sh hatcheries in central Thailand and based analysis on technical, economic and social data collected between April 1995 to May 1996 from thirty hatcheries. Fry were assessed for quality during the early and mid-spawning season from different hatcheries using a salinity challenge stress test. A clear dichotomy of scale was observed in hatchery operations in central Thailand based on annual production (de{uFB01}ned as small<73 million or large>73 million cat{uFB01}sh fry). A major center of cat{uFB01}sh hatcheries was found to be Nong Kae district in Sara Buri province and Nong Sua district in Pathum Thani province. The relative advantage of this area was its proximity to both a major source of female brood{uFB01}sh (Clarias macrocephalus) and live feed (Moina macrocopa). Female brood{uFB01}sh used to produce hybrid Clarias fry are mainly from Trichogaster culture farms in Chachoengsao and Samutprakarn province. The other signi{uFB01}cant factor is the development of mass production of the water {uFB02}ea (Mama macrocopa) pioneered by Pathum Thani Fisheries Development Station. Moina is required by hybrid Cian'as hatcheries in large quantities. Small{u2014}scale hatcheries tended to produce cat{uFB01}sh fry as a part-time activity, relying on purchased female brood{uFB01}sh whereas larger hatcheries were full-time and often produced their own brood{uFB01}sh. Although many hatcheries produced fry during the cool season (October to January), only 3 hatcheries produced fry year-round. Gonadotropic-releasing hormones were the most popular class of hormone used to stimulate ovulation, partly due to the effectiveness of a single injection. However, some larger hatcheries continued to use whole pituitary glands, claiming that better quality fry as a result. Technologies used to incubate fertilized eggs and larvae were similar irrespective of the hormone used. Application of a Cobb-Douglas production function identi{uFB01}ed female brood{uFB01}sh biomass used as the dominant explanatory variable for fry production; this input made up between 79{u2014} 87 percent of variable costs. Break-even analysis indicated that small-scale hatcheries had lower efficiencies of production than large-scale ones. Marketing of fry by hatcheries was sophisticated, involving their direct marketing to food {uFB01}sh farmers. or via middlemen and nurseries. Fierce competition has stimulated hatcheries to offer free transportation or live feeds to customers buying large numbers of seed. A challenge stress test was developed based on survival of yolk-sac fry at a salinity of 12 ppt. over a 60 minute period. Survival was compared to performance over a period of nursing. Fry quality was found to vary greatly with season; poorest quality fry were produced early in the year. Seed quality tests indicated superior quality fry were produced from female brood{uFB01}sh maintained and conditioned within the hatchery rather than from {uFB01}sh purchased and spawned immediately. The use of stress tests by hatcheries and their customers could enable them to identify poor quality fry at purchase; this could reduce the costs and risks attached to hybrid cat{uFB01}sh production considerably. |
| 650 #0 - SUBJECT ADDED ENTRY--TOPICAL TERM | |
| Topical term or geographic name entry element | Fish-culture |
| Geographic subdivision | Thailand, Central |
| 650 #0 - SUBJECT ADDED ENTRY--TOPICAL TERM | |
| Topical term or geographic name entry element | Catfishes |
| Geographic subdivision | Thailand, Central |
| 700 1# - ADDED ENTRY--PERSONAL NAME | |
| Personal name | Demaine, Harvey, |
| Relator term | Chairperson |
| 700 1# - ADDED ENTRY--PERSONAL NAME | |
| Personal name | Macintosh, Donald J., |
| Relator term | Examination committee |
| 700 1# - ADDED ENTRY--PERSONAL NAME | |
| Personal name | Johri, Lalit M., |
| Relator term | Examination Committee |
| 700 0# - ADDED ENTRY--PERSONAL NAME | |
| Personal name | Boonjit Titapiwatanakun, |
| Relator term | Examination committee |
| 700 1# - ADDED ENTRY--PERSONAL NAME | |
| Personal name | Little, David C., |
| Relator term | Examination Committee |
| 710 2# - ADDED ENTRY--CORPORATE NAME | |
| Corporate name or jurisdiction name as entry element | Overseas Development Administration (U.K.), |
| Relator term | Scholarship donor |
| 810 2# - SERIES ADDED ENTRY--CORPORATE NAME | |
| Corporate name or jurisdiction name as entry element | Asian Institute of Technology. |
| Title of a work | Dissertation ; |
| Volume/sequential designation | no. AS-97-06 |
| 856 ## - ELECTRONIC LOCATION AND ACCESS | |
| Materials specified | Full-Text |
| Uniform Resource Identifier | <a href="http://203.159.5.9/ait-thesis/detail.php?q=B00356">http://203.159.5.9/ait-thesis/detail.php?q=B00356</a> |
| 907 ## - LOCAL DATA ELEMENT G, LDG (RLIN) | |
| a | .b11723373 |
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| 998 ## - LOCAL CONTROL INFORMATION (RLIN) | |
| Operator's initials, OID (RLIN) | 0 |
| Cataloger's initials, CIN (RLIN) | 980902 |
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| 945 ## - LOCAL PROCESSING INFORMATION (OCLC) | |
| l | mnait |
| 945 ## - LOCAL PROCESSING INFORMATION (OCLC) | |
| l | mnarc |
| 942 ## - ADDED ENTRY ELEMENTS (KOHA) | |
| Koha item type | 22-AIT Thesis (Replacement) |
| 942 ## - ADDED ENTRY ELEMENTS (KOHA) | |
| Koha item type | 40-Archives |
| 909 ## - LOCAL ITEMS USED | |
| Barcode | Barcode : 30050120562995 |
| CREATED | CREATED : 1998-02-09 |
| RECORD Id | RECORD # : i12090098 |
| LPATRON | LPATRON : 1015151 |
| LCHKIN | LCHKIN : 2019-03-27 |
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| 909 ## - LOCAL ITEMS USED | |
| Barcode | Barcode : 30050160038484 |
| CREATED | CREATED : 2016-01-20 |
| RECORD Id | RECORD # : i12870614 |
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| Withdrawn status | Lost status | Damaged status | Not for loan | Home library | Current library | Shelving location | Date acquired | Total checkouts | Full call number | Barcode | Date last seen | Copy number | Price effective from | Koha item type |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Available for Loans | Asian Institute of Technology Library | Asian Institute of Technology Library | AIT Publications | 18/08/2026 | AIT Diss. no. AS-97-06 | 30050120562995 | 18/08/2026 | 3 | 18/08/2026 | 22-AIT Thesis (Replacement) | ||||
| Available for Loans | Asian Institute of Technology Library | Asian Institute of Technology Library | Archives | 18/08/2026 | AIT Diss. no. AS-97-06 | 30050160038484 | 18/08/2026 | 1 | 18/08/2026 | 40-Archives |