An individual-based simulation model for mottled sculpin (Cottus bairdi) in a southern Appalachian stream

2005 ◽  
Vol 187 (2-3) ◽  
pp. 247-258 ◽  
Author(s):  
Brenda Rashleigh ◽  
Gary D. Grossman
Keyword(s):  
Simulation Model ◽  
Southern Appalachian ◽  
Cottus Bairdi ◽  
Mottled Sculpin ◽  
Individual Based Simulation

Ultrastructure of superficial neuromasts in the mottled sculpin, Cottus bairdi

1989 ◽  
Vol 47 ◽  
pp. 958-959
Author(s):  
W.R. Jones ◽  
S. Coombs ◽  
J. Janssen
Keyword(s):  
Hair Cells ◽  
Lateral Line System ◽  
Electron Microscopic ◽  
Line System ◽  
Dense Cores ◽  
Sensory Hair Cells ◽  
Cytoplasmic Vesicles ◽  
Cottus Bairdi ◽  
Mottled Sculpin ◽  
Upper Third

The lateral line system of the mottled sculpin, like that of most bony fish, has both canal (CNM) and superficial (SNM) sensory end organs, neuromasts, which are distributed on the head and trunk in discrete, readily identifiable groupings (Fig. 1). CNM and SNM differ grossly in location and in overall size and shape. The former are located in subdermal canals and are larger and asymmetric in shape, The latter are located directly on the surface of the skin and are much smaller and more symmetrical It has been suggested that the two may differ at a more fundamental level in such functionally related parameters as extent of myelination of innervating fibers and the absence of efferent innervation in SNM. The present study addresses the validity of these last two features as distinguishing criteria by examining the structure of those SNM populations indicated in Fig. 1 at both the light and electron microscopic levels.All of the populations of SNM examined conform in general to previously published descriptions, consisting of a neuroepithelium composed of sensory hair cells, support cells and mantle cells, Several significant differences from these accounts have, however, emerged. Firstly, the structural composition of the innervating fibers is heterogeneous with respect to the extent of myelination. All SNM groups, with the possible exception of the TRrs and CFLs, possess both myelinated and unmyelinated fibers within the neuroepithelium proper (Fig. 2), just as do CNM. The extent of myelina- tion is quite variable, with some fibers sheath terminating just before crossing the neuroepithelial basal lamina, some just after and a few retaining their myelination all the way to the base of the hair cells in the upper third of the neuroepithelium. Secondly, all SNMs possess fibers that may, on the basis of ultrastructural criteria, be identified as efferent. Such fibers contained numerous cytoplasmic vesicles, both clear and with dense cores. In regions where such fibers closely apposed hair cells, subsynaptic cisternae were observed in the hair cell (Fig. 3).

Multiple spawning and the dynamics of fish populations: inferences from an individual-based simulation model

1998 ◽  
Vol 55 (10) ◽  
pp. 2244-2254 ◽  
Author(s):  
Susan K Lowerre-Barbieri ◽  
James M Lowerre ◽  
Luiz R Barbieri
Keyword(s):  
Simulation Model ◽  
Egg Production ◽  
Adult Population ◽  
Individual Variability ◽  
Spawning Season ◽  
Average Life Span ◽  
Multiple Spawning ◽  
Individual Based Simulation ◽  
First Maturity ◽  
Size At Age

We used an individual-based Monte Carlo simulation model to assess how aspects associated with multiple spawning (within a spawning season) affected survivorship, lifetime fecundity, cohort egg production, and yield-per-recruit of a highly exploited species. To make our model more realistic, we included and tested the effects of individual variability in growth and a seasonal growth pattern. Birth months influenced when fish first matured and became vulnerable to the fishery. There was a sixfold increase in mature fish at the beginning of their first spawning season associated with having been born early versus late the previous season. Early born fish had a lower average life-span than later born fish. Although early born fish had lower survivorship they produced the most eggs because of an early size at first maturity, low fishing mortality in the first year, and their larger size at age. These results suggest multiple spawning can have important implications for recruitment and adult population dynamics.

Eimeria duszynskii sp. n. (Protozoa: Eimeriidae), a Parasite of the Mottled Sculpin, Cottus bairdi Girard

1980 ◽  
Vol 66 (5) ◽  
pp. 828 ◽  
Author(s):  
George A. Conder ◽  
Reed Y. Oberndorfer ◽  
Richard A. Heckmann
Keyword(s):  
Cottus Bairdi ◽  
Mottled Sculpin
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