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Showing 1 to 20 of 488 for “"spawning"”.
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INDUCED SPAWNING OF CAPTIVE TRIPLETAIL LOBOTES SURINAMENSIS
… 17b were assayed in males and females during the spawning season using a competitive ELISA assay. Sex identification was most effective using 11-Ketotestosterone with a 1.19% error rate in cross validation of the training set. Males with low levels of this hormone in the test dataset were …
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Differential stability of spawning microhabitats of warmwater stream fishes
I investigated streambed stability in spawning microhabitats of warmwater fishes in the upper Roanoke River, Virginia. Spawning microhabitats used by four reproductive guilds (egg-clusterers, mound-builders, egg-buriers, and pit-builders) were identified and ranges of 15 microhabitat variables used …
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Behavioral ecology of coral reef fishes at spawning aggregation sites
… the behavioral and ecological relations between spawning reef fishes, predators and their environment at a spawning aggregation site. Many hypotheses have been proposed regarding the adaptive nature of different diel reproductive cycles observed in coral reef fishes. This study quantified the …
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Fate and transport of Asian carp eggs in spawning rivers
… if Asian carp will use a given river for spawning and recruitment is typically determined by comparing a river to those where spawning and recruitment were observed. This observation-based technique has led to general guidelines about the river length and hydraulic characteristics required …
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Fish spawning strategies in the variable southern Benguela Current region
… for special attention because of their different spawning strategies, and were shown to have seasonal and spatial patterns of egg and larval abundance which could be related to the environment. The major environmental process influencing ichthyoplankton abundance patterns appeared to be the …
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Behavioral ecology of coral reef fishes at spawning aggregation sites
Thesis (Ph. D.)--Joint Program in Biological Oceanography (Massachusetts Institute of Technology, Dept. of Biology; and the Woods Hole Oceanographic Institution), 1998.
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Factors affecting the timing and success of sockeye salmon spawning migrations
… the Fraser River, and then onward to distant spawning areas. Links between physiology, behaviour, and survival were examined. Circulating testosterone was found to be positively correlated with the rates of river entry in Late-run females but not in males, despite having concentrations that …
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Maturation Spawning and Larviculture of Atlantic Croaker (Micropogonias undulatus) at Low Salinity
… aquaculture involves broodstock maturation, spawning, and larval culture at high salinity. This protocol prevents the direct use of coastal water for culture along the Mississippi Gulf coast where salinity is low. This study examined the feasibility of performing hatchery production of …
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NUCLEAR PROGESTIN RECEPTOR REGULATES FERTILITY AND SPAWNING IN FEMALE CICHLID ASTATOTILAPIA BURTONI
… the effects of hormones on its well-documented spawning routine. In female cichlids, prostaglandin F2a (PGF2α) drives spawning behaviors. Sensitivity to PGF2α and expression of its receptor, ptgfr, varies across the reproductive cycle. I look to progestin as a potential regulator of PGF2α …
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Maturation, Fecundity, and Spawning Frequency of the Albemarle/Roanoke Striped Bass Stock
… in 2009 and 2010 on the Roanoke River near the spawning grounds and in Albemarle Sound during the pre-spawn, spawning, and post-spawn periods (March through May) with total lengths (TL) ranging from 300 to 1,080 mm corresponding to age-3 to age-16. Striped bass are total spawners with …
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The Relative Contribution of Hudson River Tributaries to River Herring Spawning Dynamics
… tributary contribution to anadromous fish spawning dynamics is irrefutably important when prioritizing habitat enhancement, restoration and management decisions (Everly and Boreman, 1999). Collecting sound baseline data becomes critical when seeking out the most significant contributors to …
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Feeding habits of sardine (Sardinops sagax) in relation to their spawning activities
… varied, being low in February during the spawning season and peaking thereafter in March and April. A GLM indicated that feeding intensity in sardine was affected by time of year and gonad maturity state. Sardine fed throughout the study period but feeding intensity was highest in periods …
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Environmental variables influencing spatial and temporal patterns of fish spawning and recruitment
ABSTRACT Spawning times and spawning intensity during the life cycles of some fish species found off South Africa and Norway were synthesized using data collected from the literature. The comparison of temporal patterns in spawning of South African fish species showed variable spawning times and …
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Feeding habits of sardine (Sardinops sagax) in relation to their spawning activities
… varied, being low in February during the spawning season and peaking thereafter in March and April. A GLM indicated that feeding intensity in sardine was affected by time of year and gonad maturity state. Sardine fed throughout the study period but feeding intensity was highest in periods …
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Spawning and parental care in the pink convict variety of Cichlasoma nigrofasciatum (Gunther)
Spawning and parental care in the pink variety of Cichlasoma nigrofasciatum (Gunther) was studied from September 1970 to May 1971. The objectives of the study were to determine: (1) the spawning behavior of C. nigrofasciatum when isolated as pairs; (2) the spawning behavior of a pair when sharing …
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Modelling dispersal and connectivity of broadcast spawning corals in the Western Indian Ocean
Coral reef degradation is happening at an alarming rate all over the world due to multiple stressors with elevated sea surface temperature being the root cause. Using the Regional Ocean Modelling System and an individual-based model for the western Indian Ocean, this thesis explored the general …
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Repeat spawning of the Atlantic salmon (Salmo salar) in various salmon rivers in Iceland
Information on repeat spawning in Atlantic salmon stocks from eight various rivers in Iceland was analyzed, using data collected by the Institute of Freshwater Fisheries in Iceland. The rivers differ in characteristics as well as location based on bedrock and geographical area. Available data from …
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Selection of Spawning Habitats by Horseshoe Crabs (Limulus polyphemus) along the Complex Connecticut Coast
… central, and eastern regions of Connecticut. Spawning abundances derived from field surveys of a subsample of sites conducted in May-June of 2009 and 2010 were used with the remotely sensed habitat characteristics to develop a resource selection function from a candidate model set based on …
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Multi-scale hydrogeomorphic influences on bull trout spawning habitat in snowmelt-dominated headwater streams
… size (D16, p=0.01; D50, p=0.02, D84, p=0.02). Spawning reaches exhibited high streambed horizontal and vertical hydraulic conductivities, and streambed temperatures were dominated by stream water diurnal cycles to a depth of at least 25 cm. Groundwater provided substantial thermal moderation of …
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Multi-scale hydrogeomorphic influences on bull trout spawning habitat in snowmelt-dominated headwater streams
… size (D16, p=0.01; D50, p=0.02, D84, p=0.02). Spawning reaches exhibited high streambed horizontal and vertical hydraulic conductivities, and streambed temperatures were dominated by stream water diurnal cycles to a depth of at least 25 cm. Groundwater provided substantial thermal moderation of …
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