Snail eater pangasius （Pangasius conchophilus） is a freshwater fish species indigenous to Mekong-Chaophraya Basin, and is an economic fish in Thailand. This paper reviews some Thai research papers for referable bene...Snail eater pangasius （Pangasius conchophilus） is a freshwater fish species indigenous to Mekong-Chaophraya Basin, and is an economic fish in Thailand. This paper reviews some Thai research papers for referable benefit of international countries. The relationships of fecundity with body length and weight of wild population are related （F = 0.54L3339, F = 435.41W^S399）. Length-weight relationships of both sexes are W = 0.0059L3044s. Sex ratio is 1：1 and spawning season starts during March to June, the egg is adhesive demersal. Average mature size of both sexes are from 40-60 cm TL and 1,100-2,900 g. Effect of 3 types of hormone on induced ovulation, including HCG, pituitary gland, and buserelin in combination with domperidone are not signiticantly different （P 〉 0.05）. Hatching occurs in 24-25 hours after fertilization. The hatching percentage is 80%. Nursing and feeding strategies are also reviewed in this paper.展开更多
The Thai mahseer is one of the high-value freshwater fish species, especially m Malaysia where it is cultured commercially but poorly known in Thailand. This paper reviews a recent knowledge necessary for commercial c...The Thai mahseer is one of the high-value freshwater fish species, especially m Malaysia where it is cultured commercially but poorly known in Thailand. This paper reviews a recent knowledge necessary for commercial culture of Thai mahseer based on the breeding and rearing practices in Malaysia. Breeding data shows that this species can be spawned all year round. On average, the size of mature female that can be induced to spawn is 678 mm total length （TL） and 3,817 g in weight and the size of mature male is 599 mm TL and 2,414 g in weight. Induced spawning using an analogue of sGnRH Ovaprim at 0.5 ml/kg body weight （BW） is the most successful hormone treatment and dosage for Thai mahseer. The average number of eggs is 875 egg/kg BW. Eggs of the Thai mahseer are spherical, demersal and non-sticky, and hatching occurs 69-90 hours post-fertilization. At 60 weeks of age, average body weight is 179 g. Polynomial regression analysis revealed a maximum specific growth rate at 48% dietary protein. General biology, water quality requirements, feeding strategies and genetic structure of the Thai mahseer are also summarized in this paper.展开更多
The molluscivorous catfish, Helicophagus leptorhynchus is an economic fish in Thailand, but the fish is poorly know. This paper is a review of some biology support data for aquaculture and fisheries. The fish distribu...The molluscivorous catfish, Helicophagus leptorhynchus is an economic fish in Thailand, but the fish is poorly know. This paper is a review of some biology support data for aquaculture and fisheries. The fish distributed in Mekong-Chaophraya Basin. The spawners migrate to upstream in early flood season for spawning. After hatching, the fish larva migrating in downstream and the juvenile fish move in deep pool of Mekong Basin on dry season. Adult fish live in downstream and large tributary. The fish is omnivorous and bottom feeder. Spawning season of the fish is May-July. Gillnetting and beach seine fisheries are main the catfish＇s fisheries in Thailand and the catfish＇s fisheries season in Mekong River began on January-July.展开更多
文摘Snail eater pangasius （Pangasius conchophilus） is a freshwater fish species indigenous to Mekong-Chaophraya Basin, and is an economic fish in Thailand. This paper reviews some Thai research papers for referable benefit of international countries. The relationships of fecundity with body length and weight of wild population are related （F = 0.54L3339, F = 435.41W^S399）. Length-weight relationships of both sexes are W = 0.0059L3044s. Sex ratio is 1：1 and spawning season starts during March to June, the egg is adhesive demersal. Average mature size of both sexes are from 40-60 cm TL and 1,100-2,900 g. Effect of 3 types of hormone on induced ovulation, including HCG, pituitary gland, and buserelin in combination with domperidone are not signiticantly different （P 〉 0.05）. Hatching occurs in 24-25 hours after fertilization. The hatching percentage is 80%. Nursing and feeding strategies are also reviewed in this paper.
文摘The Thai mahseer is one of the high-value freshwater fish species, especially m Malaysia where it is cultured commercially but poorly known in Thailand. This paper reviews a recent knowledge necessary for commercial culture of Thai mahseer based on the breeding and rearing practices in Malaysia. Breeding data shows that this species can be spawned all year round. On average, the size of mature female that can be induced to spawn is 678 mm total length （TL） and 3,817 g in weight and the size of mature male is 599 mm TL and 2,414 g in weight. Induced spawning using an analogue of sGnRH Ovaprim at 0.5 ml/kg body weight （BW） is the most successful hormone treatment and dosage for Thai mahseer. The average number of eggs is 875 egg/kg BW. Eggs of the Thai mahseer are spherical, demersal and non-sticky, and hatching occurs 69-90 hours post-fertilization. At 60 weeks of age, average body weight is 179 g. Polynomial regression analysis revealed a maximum specific growth rate at 48% dietary protein. General biology, water quality requirements, feeding strategies and genetic structure of the Thai mahseer are also summarized in this paper.
文摘The molluscivorous catfish, Helicophagus leptorhynchus is an economic fish in Thailand, but the fish is poorly know. This paper is a review of some biology support data for aquaculture and fisheries. The fish distributed in Mekong-Chaophraya Basin. The spawners migrate to upstream in early flood season for spawning. After hatching, the fish larva migrating in downstream and the juvenile fish move in deep pool of Mekong Basin on dry season. Adult fish live in downstream and large tributary. The fish is omnivorous and bottom feeder. Spawning season of the fish is May-July. Gillnetting and beach seine fisheries are main the catfish＇s fisheries in Thailand and the catfish＇s fisheries season in Mekong River began on January-July.
