Influences of Anadromous Spawning Behavior and Optimal Environmental Conditions Upon Striped Bass (Morone saxatilis) Year-Class Success

1980 ◽  
Vol 37 (2) ◽  
pp. 143-154 ◽  
Author(s):  
R. E. Ulanowicz ◽  
T. T. Polgar
Keyword(s):  
Striped Bass ◽  
Environmental Conditions ◽  
Transport Model ◽  
Transition Probabilities ◽  
Morone Saxatilis ◽  
Spawning Behavior ◽  
Two Factors ◽  
Model Year ◽  
Eggs And Larvae ◽  
Potomac Estuary

An analysis of the spatial and temporal abundance patterns of developing striped bass (Morone saxatilis) ichthyoplankton stages in the Potomac Estuary, including a Markovian description of transport, indicates that annual differences in the distribution of spawning fish are not likely to account wholly for the wide fluctuations in year-class success. Year-class success can be decomposed into the product of two factors — one extrinsic, acting upon the eggs and larvae, and the other, a behavioral property of the adult stock. The effect of extrinsic environmental conditions upon year-class success can be measured relative to the maximum computed survival of eggs to post-finfold larvae among all locations and times during a given year. Apparently, the behavior of the spawning adult fish is not well matched with the environmental conditions favorable to ichthyoplankton survival, and therefore, the actual spawning distribution yields only a fraction (the spawning fitness) of the maximum production possible during that year. Spawning fitnesses were estimated to be small (< 0.02 out of 1.0) and varied by less than a factor of two over the three seasons observed. In contrast, the year-class success as measured by post-finfold production differed 35-fold over the same 3 yr. It appears most likely that the large range in success is due primarily to the extrinsic, density-independent environmental factors which determine the optimum survivals in combination with spawning behavior. However, no strong case can be made for behavioral compensation by spawning fish to offset changes in the annual optimum survival conditions for ichthyoplankton.Key words: anadromous, ichthyoplankton development, Markovian transition probabilities, optimal survival, spawning behavior, spawning fitness, striped bass, transport model, year-class success

Comparison of Ozone and Chlorine Toxicity to the Developmental Stages of Striped Bass, Morone saxatilis

1981 ◽  
Vol 38 (7) ◽  
pp. 752-757 ◽  
Author(s):  
Lenwood W. Hall Jr. ◽  
Dennis T. Burton ◽  
Leonard B. Richardson
Keyword(s):  
Striped Bass ◽  
Developmental Stages ◽  
Life Stage ◽  
Morone Saxatilis ◽  
Estuarine Water ◽  
Toxicity Data ◽  
Flow Conditions ◽  
Chlorine Toxicity ◽  
Eggs And Larvae ◽  
Higher Sensitivity

Toxicity of ozone-produced oxidants (OPO) to striped bass, Morone saxatilis, eggs, larvae, and fingerlings was determined under continuous-flow conditions. Eggs, tested in both fresh and estuarine water, were found to be significantly (P < 0.001) more sensitive to OPO in freshwater. The higher sensitivity found for striped bass eggs in freshwater suggests that ozone could have a more pronounced effect if discharged in freshwater industrial or municipal wastewaters located in the vicinity of a striped bass spawning area. The ozone data collected in this study were compared with previously published chlorine toxicity data for each striped bass life stage. The toxicity of chlorine and ozone was found to be similar with striped bass eggs and larvae in estuarine water. LC50's for fingerlings were 0.20 mg/L OPO at 6 h and 0.08 mg/L OPO at 96 h.Key words: ozone, oxidants, chlorine, striped bass, Morone saxatilis; wastewaters

scholarly journals Effects of Shear on Eggs and Larvae of Striped Bass, Morone saxatilis, and White Perch, M. americana

1976 ◽  
Vol 105 (1) ◽  
pp. 149-154 ◽  
Author(s):  
Raymond P. Morgan ◽  
Robert E. Ulanowicz ◽  
V. James Rasin ◽  
Linda A. Noe ◽  
G. Brooke Gray
Keyword(s):  
Striped Bass ◽  
White Perch ◽  
Morone Saxatilis ◽  
Eggs And Larvae

Emamectin benzoate is a safe and effective anthelmintic against coelomic nematode Philometra rubra in striped bass Morone saxatilis

2020 ◽  
Vol 142 ◽  
pp. 47-53
Author(s):  
K Béland ◽  
G Séguin ◽  
S Lair
Keyword(s):  
Mortality Rate ◽  
Striped Bass ◽  
High Mortality ◽  
Morone Saxatilis ◽  
Treatment Results ◽  
Emamectin Benzoate ◽  
Once Daily ◽  
Fish Hatchery ◽  
Parasitic Burden

An unusually high mortality rate due to verminous (Philometra rubra) coelomitis was documented in wild-hatched striped bass Morone saxatilis raised in a fish hatchery as part of a stock restoration program. To decrease the parasitic burden and therefore potentially minimize mortality, the effectiveness of 2 different anthelmintics was evaluated. Two trials were conducted on wild-collected fingerlings naturally infected by P. rubra. In 2006, 144 yearling fish were randomly assigned to 4 experimental groups: (1) levamisole (Levasol®) at 2 mg l-1 via immersion for 8 h once weekly for 3 wk; (2) levamisole at a dose of 2.5 mg kg-1 biomass via feed once daily for 7 d; (3) emamectin benzoate (Slice®) at a dose of 0.05 mg kg-1 biomass via feed once daily for 7 d; and (4) control. Emamectin successfully eliminated live nematodes in 84.9% of the fish, whereas the administration of levamisole, either via immersion or feed, was not successful in significantly reducing the number of live P. rubra. In 2007, the administration of the same dosage of emamectin to approximately 1000 naturally infected yearling striped bass was associated with a 100% mortality rate of P. rubra in the 30 fish randomly examined 5 wk after the beginning of the treatment. Results of these trials indicate that, at the dosage used, the administration of emamectin at the end of the summer is safe for striped bass yearlings and considerably reduces the prevalence and intensity of the infection by this parasite.

Feeding ecology of early life stages of striped bass (Morone saxatilis) along an estuarine salinity-turbidity gradient, St. Lawrence Estuary, Canada

2019 ◽  
Vol 41 (4) ◽  
pp. 507-520 ◽  
Author(s):  
L Vanalderweireldt ◽  
P Sirois ◽  
M Mingelbier ◽  
G Winkler
Keyword(s):  
Striped Bass ◽  
Feeding Ecology ◽  
Early Life ◽  
Morone Saxatilis ◽  
Early Summer ◽  
Gut Contents ◽  
Life Stages ◽  
Early Life Stages ◽  
Lawrence Estuary ◽  
Feeding Niche

Abstract After being extirpated from the St. Lawrence River in the 1960s, striped bass (Morone saxatilis) were reintroduced to the estuary in 2002 and by 2008, they were naturally reproducing. To document the habitat use and feeding ecology of this reintroduced population, we examined the gut contents of 333 larvae and juveniles. Samples were collected in four estuarine habitats in 2014: the upstream freshwater section (UP), the oligohaline (O-ETM) and the mesohaline (M-ETM) estuarine turbidity maximum zones, and the downstream polyhaline section (DOWN). In June, pelagic larvae developed in the UP and the O-ETM, feeding mainly on copepods such as Eurytemora affinis. The O-ETM exhibited better suitable feeding conditions compared to the UP, likely due to the presence of Bosmina sp. as a primary prey. After July, striped bass shifted to larger prey items, consuming mainly dipteran pupa in upstream littoral habitats and gammarids and mysids in downstream habitats. In the early summer, the UP provided a high-quality nursery habitat and as the season progressed, the smallest juveniles dispersed downstream and improved their feeding success by exploiting a new feeding niche. This observation suggests that being distributed throughout the estuary may increase the potential survival of striped bass early life stages.

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