Macrocephalus Research Articles

Textural Properties of Gel Made from Hybrid Catfish (Clarias macrocephalus x C.gariepinus) Fillets Chilled in Ice and at Temperature of 4 ÌC

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Comparison of cold and heat shocks to induce diploid gynogenesis in Thai walking catfish (Clarias macrocephalus) and performances of gynogens

Des stocks importants de femelles Clarias macrocephalus sont necessaires chaque annee pour produire des poissons-chats hybrides qui detiennent a la fois la qualite de la chair maternelle, et la croissance rapide et la resistance aux maladies paternelles du poisson-chat africain Clarias gariepinus. Par consequent, des individus gynogenetiques diploides ont ete induits chez le poisson-chat Clarias macrocephalus et leurs potentialites ont ete evaluees pour l'aquaculture. L'induction a ete realisee par irradiation UV du sperme de poisson-chat Pangasius sutchi suivie de chocs thermiques soit chauds soit froids 4,5 min apres l'activation. Parmi les chocs chauds, ceux effectues a 42°C durant 1 min etaient les plus performants. Les chocs froids (7°C pendant 14 min) ont donne de plus forts pourcentages significatifs de larves diploides (26-41%) que les chocs chauds (12-26%). Les individus gynogenetiques âges de 6 mois etaient tous femelles et presentaient des croissances legerement inferieures aux temoins mâles et aux temoins femelles. Les temoins mâles, les temoins femelles et les individus gynogenetiques âges de 6 mois ne presentaient pas de difference de taille. Le taux de survie des individus gynogenetiques (73±8%) etait legerement inferieur a ceux des temoins des deux sexes (87±10%). L'indice gonado-somatique des individus gynogenetiques âges de 1 an (5,7%) etait legerement inferieur a celui des femelles temoins (8,8%). Par consequent, l'usage direct de femelles gynogenetiques pour ameliorer la production de poissons-chats de Thailande est incertain. Cependant, leur utilite a des fins de reproduction est prometteur.

Arrama, new genus (Siphonostomatoida : Caligidae), with two new species, copepods parasitic on Australian fishes

ABSTRACT A new genus, Arrama, and two new species, A. tandani and A, cordata, belonging to the copepod family Caligidae (Siphonostomatoida), are described from the gill filaments of two species of plotosid catfishes, Cnidoglanis macrocephalus (Valenciennes) and an undescribed species of Paraplotosus, respectively, from Australia. The new genus can be distinguished from confamilial genera by a combination of characters that include (1) the reduced apical armature of the leg 1 exopod, (2) the 2-segmented rami of leg 2, (3) the absence of the ventral apron of leg 3, and (4) the reduction of legs 3 and 4 to setiferous lobes. The two new species are distinguished from each other by the shape of the genital complex, the setae of the caudal ramus, the arrangement of spinules of the canna of the second maxilla, the apical armature of the leg 1 exopod, and the terminal armature of the leg 2 exopod. The morphology of the suckerlike cephalothorax of the members of the Caligidae appears to be an adaptation for attachment to smooth flat surfaces, i.e., external body surfaces, buccal cavity walls, and branchial chamber walls of the hosts. Two genera, Abasia and Hermilius, have become specialized for living on gill filaments of their hosts by modifications of their cephalothoraces. Although the ventral apron, a structure formed by the expansion of the intercoxal plate and sympod of leg 3, remains intact in these two genera, it may no longer be functional. Members of the new genus, Arrama, which also live on gill filaments, lack the ventral apron.

On the Demersal Quality of the Fertilized Eggs of Pacific Cod, Gadus macrocephalus Tilesius

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II. Observations upon the Hemipterous Insects composing the Genus Syrtis of Fabricius, or the Family Phymatites of Laporte, with a Monograph of the Genus Macrocephalus

II. Observations upon the Hemipterous Insects composing the Genus Syrtis of Fabricius, or the Family Phymatites of Laporte, with a Monograph of the Genus Macrocephalus