Evidence for a morphological component in acid-base regulation during environmental hypercapnia in the brown bullhead (Ictalurus nebulosus)

1992 ◽  
Vol 268 (3) ◽  
pp. 539-552 ◽  
Author(s):  
Greg G. Goss ◽  
Pierre Laurent ◽  
Steve F. Perry
Keyword(s):  
Acid Base ◽  
Brown Bullhead ◽  
Ictalurus Nebulosus ◽  
Morphological Component

Circadian rhythms in the brown bullhead, Ictalurus nebulosus (Teleostei). Evidence for an endogenous rhythm in feeding, locomotor, and reaction time behaviour

1980 ◽  
Vol 58 (10) ◽  
pp. 1899-1907 ◽  
Author(s):  
Lars-Ove Eriksson ◽  
Theo van Veen
Keyword(s):  
Reaction Time ◽  
Locomotor Activity ◽  
Feeding Activity ◽  
Brown Bullhead ◽  
Phase Angle Difference ◽  
Ictalurus Nebulosus ◽  
Angle Difference ◽  
Dark Regime ◽  
Free Running ◽  
Time Latency

Locomotor and feeding activity was investigated under(1) 12 h light(L): 12 h dark(D)and 16 h L: 8 h D, (2) 24 h D and 24 h L, and (3) dark pulses (0.75 h L: 0.25 h D), in the brown bullhead (Ictalurus nebulosus). In addition to locomotor and feeding activity, reaction time (latency time on lights-off and lights-on) was also measured.Fish subjected to a light–dark regime showed nocturnal behaviour, in many cases with a positive phase angle difference (i.e., the animals ceased their activity several hours before lights-on). Further, the actograms showed, as expected, a distinct 24 h rhythm. Only 2 brown bullheads out of 15, subjected to constant conditions, showed a circadian component in the locomotor activity, which could only be detected by frequency analysis.Nine out of 12 animals subjected to dark pulses (0.75 h L: 0.25 h D) showed a free-running circadian rhythm (approximately 23 h) in locomotor activity and 2 out of 3 showed such a rhythm in feeding activity. Observations and measurements of reaction time on leaving and re-entering the shelter after lights-off and lights-on (0.75 h L: 0.25 h D) showed also that this parameter has a circadian course. Measurements performed a fortnight later showed a similar, but less pronounced, pattern of behaviour.Dark pulses are thought to prevent rapid dissociation of a flexible multioscillatory circadian system in the brown bullhead.

Aggression of guarding male smallmouth bass (Micropterus dolomieui) towards potential brood predators near the nest

1993 ◽  
Vol 71 (2) ◽  
pp. 437-440 ◽  
Author(s):  
R. J. Ongarato ◽  
E. J. Snucins
Keyword(s):  
Aggressive Behaviour ◽  
Yellow Perch ◽  
Perca Flavescens ◽  
Smallmouth Bass ◽  
Brown Bullhead ◽  
Ictalurus Nebulosus ◽  
Defence Behaviour ◽  
Micropterus Dolomieui ◽  
Brood Guarding

Models of potential brood predators placed near the nest were used to elicit defence behaviour in male smallmouth bass (Micropterus dolomieui) in the field. The three predator models represented a conspecific, a species found in the lake (yellow perch, Perca flavescens), and a species not present in the lake (brown bullhead, Ictalurus nebulosus). Aggressive behaviour increased with brood age and with decreasing distance between model and nest. Brood-guarding smallmouth bass exhibited a generalized response to the three predator models and did not discriminate between them by altering levels of aggression.

Ictalurus nebulosus (Lesueur) (Brown bullhead) 2n = 60

1973 ◽  
pp. 17-19
Author(s):  
Maria Luiza Beçak ◽  
Willy Beçak ◽  
Franklin L. Roberts ◽  
Robert N. Shoffner ◽  
E. Peter Volpe
Keyword(s):  
Brown Bullhead ◽  
Ictalurus Nebulosus

Fine structure of the axillary gland in the brown bullhead (Ictalurus nebulosus)

1991 ◽  
Vol 224 (4) ◽  
pp. 669-676 ◽  
Author(s):  
M. Whitear ◽  
G. Zaccone ◽  
S. Fasulo ◽  
A. Licata
Keyword(s):  
Fine Structure ◽  
Brown Bullhead ◽  
Ictalurus Nebulosus ◽  
Axillary Gland

scholarly journals Dermal Melanoma with Schwannoma-Like Differentiation in a Brown Bullhead Catfish (Ictalurus Nebulosus)

2002 ◽  
Vol 14 (3) ◽  
pp. 247-250 ◽  
Author(s):  
Kaori Sakamoto ◽  
M. Randall White
Keyword(s):  
Cell Junctions ◽  
Neurofilament Protein ◽  
Brown Bullhead ◽  
Cytoplasmic Staining ◽  
Color Changes ◽  
Ictalurus Nebulosus ◽  
Spindle Cells ◽  
Eosinophilic Cytoplasm ◽  
S 100 ◽  
Monomorphic Population

A dermal melanoma with histologic similarities to mammalian melanocytic schwannomas was diagnosed in a wild-caught brown bullhead catfish ( Ictalurus nebulosus). The diagnosis was based on cytologic, histopathologic, immunohistochemical, and ultrastructural findings. The neoplasm protruded from the cutaneous surface of the dorsal midline immediately caudal to the dorsal fin, was diffusely black and focally ulcerated, and was attached to the underlying skin by a broad-based stalk. Cytologically, the tumor was composed of a monomorphic population of melanophores, the melanin-producing and storing cells within the dermis and epidermis of fish that are partially responsible for rapid color changes. Histopathologic examination of the neoplasm revealed an unencapsulated, well-circumscribed, moderately cellular neoplasm composed of 2 distinct cell populations: spindle cells arranged in a “herringbone” pattern and numerous melanophores. The spindle cells had scant bipolar eosinophilic cytoplasm, with small centrally located vesicular nuclei; nucleoli were not seen. The histologic appearance was similar to that described for mammalian melanocytic schwannomas. Immunohistochemically, the spindle cells exhibited positive cytoplasmic staining for S-100 protein but were negative for vimentin, neurofilament protein, and glial fibrillary acidic protein. Ultrastructurally, the tumor consisted of neoplastic spindle cells with rudimentary cell junctions, actin bundles, and few melanosomes and melanophores with abundant intracytoplasmic melanosomes.

Reproduction et dynamique de population de la barbotte brune Ictalurus nebulosus (Le Sueur) dans la frayère de la rivière aux Pins, fleuve Saint-Laurent, près de Montréal (Québec)

1982 ◽  
Vol 60 (1) ◽  
pp. 31-39
Author(s):  
Gilles Harvey ◽  
Rejean Fortin
Keyword(s):  
Population Dynamics ◽  
Population Density ◽  
Sexual Maturity ◽  
Total Mortality ◽  
Northern Pike ◽  
Spawning Activity ◽  
Brown Bullhead ◽  
Ictalurus Nebulosus ◽  
Dynamique De Population ◽  
St Lawrence River

Two trap nets set in Rivière aux Pins, near its confluence with the St. Lawrence River, permitted the capture and subsequent marking or tagging of adult brown bullhead for the study of their reproductive biology and population dynamics. Spawning activity is examined in relation to water temperature and water level which, in 1976 and 1977, was controlled by means of a log weir, in order to enhance northern pike reproductive success. The study of sex ratio, sexual maturity, gonadosomatic ratio, and fecundity served to characterize the Rivière aux Pins bullhead spawning population. The results of the captures, markings, taggings, and recaptures led to the evaluation of total mortality, several aspects of exploitation by sport fishing, movements, population density, biomass, production, and yield.

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