Primary and secondary stress responses of striped bass (Morone saxatilis) exposed to benzene

1986 ◽  
Vol 92 (2) ◽  
pp. 245-254 ◽  
Author(s):  
R. B. MacFarlane ◽  
P. E. Benville
Keyword(s):  
Striped Bass ◽  
Stress Responses ◽  
Morone Saxatilis ◽  
Secondary Stress

Effects of Exercise Conditioning on Stress Responses and Recovery in Cultured and Wild Young-of-the-Year Striped Bass, Morone saxatilis

1993 ◽  
Vol 50 (10) ◽  
pp. 2094-2099 ◽  
Author(s):  
Paciencia S. Young ◽  
Joseph J. Cech Jr.
Keyword(s):  
Striped Bass ◽  
Stress Responses ◽  
Plasma Cortisol ◽  
Enhanced Recovery ◽  
Physiological Responses ◽  
Morone Saxatilis ◽  
Wild Fish ◽  
Plasma Lactate ◽  
Handling Stress ◽  
Young Of The Year

Exercise conditioning at 1.2–2.4 body lengths∙s−1 for 60 d significantly improved physiological responses to and decreased recovery time from capture, net confinement, and crowding (collectively, "handling") stress in cultured and wild young-of-the-year striped bass, Morone saxatilis. Plasma cortisol increased dramatically 0.5 h after acute handling in all treatments. However, cortisol returned to prestress levels 4 h after handling in exercise-conditioned cultured and wild fish but not in the respective unexercised fish. Handling stress in all groups of fish also resulted in hyperlacticemia. Faster clearance of plasma lactate following handling stress was shown in exercise-conditioned cultured and wild striped bass compared with unexercised fish. Handling stress resulted in a rapid hemoconcentration as indicated by increases in osmolality and hematocrit levels. Osmotic imbalance was less severe in exercise-conditioned cultured and wild fish than in unexercised fish. These improved stress responses and enhanced recovery in young-of-the-year striped bass should result in increased survival of both cultured and wild fish after transport and stocking into the natural environment.

Effects of Different Exercise Conditioning Velocities on the Energy Reserves and Swimming Stress Responses in Young-of-the-Year Striped Bass (Morone saxatilis)

1994 ◽  
Vol 51 (7) ◽  
pp. 1528-1534 ◽  
Author(s):  
Paciencia S. Young ◽  
Joseph J. Cech Jr.
Keyword(s):  
Striped Bass ◽  
Stress Responses ◽  
Morone Saxatilis ◽  
Dry Weight ◽  
Fish Muscle ◽  
Swimming Stress ◽  
Muscle Ph ◽  
Wet Weight ◽  
Young Of The Year ◽  
Very High

Young-of-the-year striped bass (Morone saxatilis) were exercise conditioned for 60 d at four different water velocities: <0.02 (control), 0.5–1.2 (slow), 1.5–2.4 (moderate), and 2.4–3.6 body lengths∙s−1 (fast). Exercise conditioning at the moderate velocity increased body weight and standard length. Lipid contents and wet weight lipid percentages in the carcass were higher in the moderate- and fast-velocity fish than in the controls, and dry weight lipid percentages in the carcass and whole fish at the moderate velocity were higher than in those conditioned at the fast velocity. Moderate-velocity fish had resting (nonstressed) cortisol levels lower than those in the controls. After swimming stress, plasma cortisol, lactate, osmolality, and hematocrit levels in all fish were very high with no significant differences among treatments, while muscle pH values in all fish were lower than those in resting fish. Within the post-swimming stressed fish, muscle pH was lower in the controls than in those conditioned at the fast velocity. Overall, exercise conditioning in the moderate to fast velocity range increased body lipids and decreased post-swimming stress acidosis in young-of-the-year striped bass.

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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