Daily activity rhythms of the African catfish<i>Heterobranchus longifilis</i>(Clariidae) in an experimental enclosure

Anselme, Patrick; Bernaerts, Pascale; Poncin, Pascal

doi:10.1051/alr:2008055

Cited by 3 publications

(2 citation statements)

References 23 publications

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“…The simultaneous development of barbell with its taste bud, removal of epicanthus off the eyes, increase in mouth gaping and gradual depletion of the yolk prepared the larvae for adaptation and active exogenous feeding. Our results indicate that larvae of H. bidorsalis are highly photophobic like S. parahybae (Caneppele et al 2009 ; Honji et al 2012 ); and very active at night than day time like their congener, H. longifilis (Anselme et al 2008 ). These attributes have to be cared for during feeding programmes or nutritional studies for better performance, hence feeding in the dark is recommended.…”

Section: Discussionmentioning

confidence: 62%

Embryonic and larval developmental stages of African giant catfish Heterobranchus bidorsalis (Geoffroy Saint Hilaire, 1809) (Teleostei, Clariidae)

Olaniyi

Omitogun

2014

SpringerPlus

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The dearth of African giant catfish Heterobranchus bidorsalis seeds poses great threat to its aquaculture and biodiversity, hence detailed knowledge and understanding of its embryology is indispensable for its artificial propagation and conservation programmes. Photomicrographs of extruded oocyte through all developmental cell stages of live embryo to larval stage are documented with the aid of a light microscope. The optical transparency of the developing embryo enabled us to describe its deep structures, distinctive features and characterize the stages pictorially. Extruded oocyte had a mean diameter of 1 ± 0.1 mm, ~20% increase when hydrated, and bounded by double thin perivitelline membranes. The first mitotic cleavage occurred at 69 min post-fertilization (pf) resulting in 2, 4 (2 × 2 array of cells), 8 (2 × 4), 16 (4 × 4), 32 (4 × 8), 64 (2 × 4 × 8) blastomeres, then developed to morula, blastula and gastrula stages. Blastula was featured by formation of enveloping layer and yolk syncytial layer. Onset of epiboly at 3 h 57 min depicted the commencement of gastrula while closure of blastopore at 11 h 8 min marked its completion. Neurulation period was distinct from segmentation where organogenesis was fully active. Embryo sudden muscular contraction was noticed at ~17 h pf, increased prior to hatching with caudal locomotion firstly at 42 s interval. Heartbeat of embryo commenced at ~1 h before its unique eclosion at average of 72 beats/min while first larva emerged at 21 h at a controlled temperature of 28.5 ± 0.5°C. Mean total length (TL) of larvae and their pouch thickness were 5 ± 1 mm and 0.05 ± 0.02 mm respectively. 1 –day old larvae revealed 8 distinctive neuromeres and by day 3, epicanthus folds of the eyes were fully uncovered; and thereafter commenced exogenous feeding. At day 4, larvae recorded mean TL of 9 ± 1 mm and 15 caudal fin rays. The fin bifurcation to dorsal and adipose fins was observed at third and half weeks post-hatchability with the dorsal fin length to adipose fin was 1.7:1. This study, for the first time, presents significant morpho-sequential developmental stages of H. bidorsalis and registers its unique form of eclosion.

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Section: Discussionmentioning

confidence: 62%

Embryonic and larval developmental stages of African giant catfish Heterobranchus bidorsalis (Geoffroy Saint Hilaire, 1809) (Teleostei, Clariidae)

Olaniyi

Omitogun

2014

SpringerPlus

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“…This probably could be the case in the current experiment which took place in a reduced light environment. Low 5 -HT activity in the brain of Heterobranchus longifilis could undermine the possible effectiveness of dietary TRP supplementation in a fish known to be more active at night (Baras et al 1998: Anselme et al, 2008) thus the insignificant cannibalism inhibition in the fish under the current study.…”

Section: Discusion 41 Effects Of Tryptophan Supplemented Diets On Can...mentioning

confidence: 84%

Dietary Tryptophan Supplementation Made No Difference on the Cannibalism, Survival and Growth of Heterobranchus longifilis fingerlings

Ola Amarachi,

Isonguyoh

2024

IJLSAR

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Heterobranchus longifilis is a popular cultured and food fish but its cannibalism greatly reduces harvest thus necessitating proactive control measures. Tryptophan is believed to raise the serotogenic activity in the brain at certain levels leading to reduced aggression and cannibalism in certain species of fish which possibilities this research tried to explore in Heterobranchus longifilis. Fingerlings (0.58 ± 0.123g mean weight and 3. 8 ± 0.52cm mean length) were stocked in 18 round plastic tanks, each 45 litres containing 40 litres of water, at 45 fish per tank. Tryptophan was incorporated at 0.0, 0.5, 1.0, 1.5, 2.0 and 2.5 % in commercial Catfish feed by spraying each tryptophan - 70% alcohol solution to separate feed samples to form six different experimental feeds. The dried feeds were fed to the fish daily at 4 % body weight for 8 weeks. The experiment used a complete randomized design with 6 feed treatments and 3 replications. Water quality, growth, mortality and feed utilization data noted and at the end, their associated indices were determined and subjected to the analysis of variance for significant differences (P= 0.05). The results revealed that tryptophan supplementation at the levels used in the diets of Heterobranchus longifilis did not have any significant effects on all the parameters examined excepting mean weight gain. This was discussed in the context of growth and cannibalism.

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Electrical Activity and Predation in the Clariid Catfish Clarias macrocephalus (Clariidae) Exposed to Varying Illumination

Olshanskiy

Kasumyan

2018

J. Ichthyol.

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Daily activity rhythms of the African catfishHeterobranchus longifilis(Clariidae) in an experimental enclosure

Cited by 3 publications

References 23 publications

Embryonic and larval developmental stages of African giant catfish Heterobranchus bidorsalis (Geoffroy Saint Hilaire, 1809) (Teleostei, Clariidae)

Embryonic and larval developmental stages of African giant catfish Heterobranchus bidorsalis (Geoffroy Saint Hilaire, 1809) (Teleostei, Clariidae)

Dietary Tryptophan Supplementation Made No Difference on the Cannibalism, Survival and Growth of Heterobranchus longifilis fingerlings

Electrical Activity and Predation in the Clariid Catfish Clarias macrocephalus (Clariidae) Exposed to Varying Illumination

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