scholarly journals Evaluation of Juvenile Fish Bypass and Adult Fish Facilities at Water Diversions in the Umatilla River; 1992 Annual Report.

1993 ◽  
Author(s):  
Suzanne M Knapp
Keyword(s):  
Annual Report ◽  
Juvenile Fish ◽  
Adult Fish ◽  
Water Diversions

KINEMATICS OF LABRIFORM AND SUBCARANGIFORM SWIMMING IN THE ANTARCTIC FISH NOTOTHENIA NEGLECTA

1989 ◽  
Vol 143 (1) ◽  
pp. 195-210 ◽  
Author(s):  
STEPHEN D. ARCHER ◽  
IAN A. JOHNSTON
Keyword(s):  
Swimming Performance ◽  
Juvenile Fish ◽  
Antarctic Fish ◽  
Adult Fish ◽  
Fibre Type Composition ◽  
Pectoral Fins ◽  
Type Composition ◽  
Burst Swimming ◽  
The Antarctic ◽  
Tail Beat

1. The kinematics of labriform and subcarangiform swimming have been investigated for juvenile (7–8 cm) and adult (27–30 cm) stages of the antarctic teleost Notothenia neglecta Nybelin at 1–2 °C 2. Upper threshold speeds using the pectoral fins alone (labriform swimming) were 0.8LS−1 in adult fish and 1.4Ls−1 in juveniles, where L is body length 3. In adult fish, steady subcarangiform swimming is only used at speeds of 3.6-5.4Ls−1 (tail-beat frequencies of 5.0-8.3Hz). Intermediate speeds involve unsteady swimming. In contrast, juvenile fish employ subcarangiform swimming at a range of intermediate velocities between the maximum labriform and burst speeds (2.3-8.4Ls−1 at tail-beat frequencies of 4.0-12.5 Hz). These differences in swimming behaviour are discussed in relation to changes in life-style and muscle fibre type composition between juvenile and adult fish 4. Burst swimming speeds in N. neglecta have been compared with equivalent data from temperate species. It seems likely that low temperature limits swimming performance in antarctic fish. This is more noticeable in juvenile stages, which normally have much higher tail-beat frequencies than adult fish

​Molecular Mechanism of Extreme Hypoxia Tolerance Difference between Male and Female Adult Fish and Juvenile Fish of Acrossocheilus fasciatus by Transcriptomics

2021 ◽  
Author(s):  
Jinghong He ◽  
Handong Wang ◽  
Yongyao Guo ◽  
Zhangjie Chu ◽  
Bo Zhao
Keyword(s):  
Molecular Mechanism ◽  
Juvenile Fish ◽  
Hypoxia Tolerance ◽  
Limiting Factor ◽  
Adult Fish ◽  
Female Adult ◽  
Male Adult ◽  
Male And Female ◽  
The Difference ◽  
And Gender

Background: Dissolved oxygen in water is an important limiting factor for fish. In this study, the suffocation point and transcriptomes analysis of Acrossocheilus fasciatus with different age and gender are helpful to analyze the effects of gender and age on extreme hypoxia tolerance. Methods: First of all, we compared the difference in tolerance to extreme hypoxia among 15 fish from male adult fish, female adult fish and juvenile fish of Acrossocheilus fasciatus in each group by asphyxiation point experiment. Then, we analyzed the molecular mechanism of extreme hypoxia tolerance difference between male and female adult fish and juvenile fish by transcriptomics. Result: Female adult fish of Acrossocheilus fasciatus showed the strongest tolerance to extreme hypoxia in the asphyxiation point experiment. In transcriptomes experiments in all samples, we found that the expression of ncoa4 and facl4 was significantly down regulated and the expression of jnk, gpx4 and jip-1 was significantly increased in females adult fish.

Does rapid scavenging hide non-predation mortality in coral-reef communities?

2011 ◽  
Vol 62 (5) ◽  
pp. 510 ◽  
Author(s):  
Andrew Rassweiler ◽  
Thomas Rassweiler
Keyword(s):  
Coral Reefs ◽  
Fish Community ◽  
Juvenile Fish ◽  
Trophic Levels ◽  
Fish Mortality ◽  
Adult Fish ◽  
Predation Mortality ◽  
Reef Fish Community ◽  
Main Pathway

Predation is assumed to be a principal cause of adult fish mortality on coral reefs, and therefore a main pathway by which biomass is passed to higher trophic levels. However, the strength of predation has mostly been demonstrated on juvenile fish, and even with juveniles, when predators are excluded, substantial mortality still occurs. Mortality from causes other than predation is rarely considered, because carrion is not common on coral reefs, but the strength of this inference depends crucially on the rate of scavenging. We tested the hypothesis that removal of carrion through scavenging may be very rapid by placing undamaged fish carcasses of a range of species and sizes on reefs in Curaçao, monitoring their rate of disappearance. All carrion was consumed within 24 h and at such rapid rates that, if non-predation mortality were occurring, it would leave little evidence on the reef. Carcasses were consumed almost exclusively by fish, mainly reef-associated piscivores, indicating that scavenged biomass is tightly recycled within the reef fish community. The results of this study suggest that more attention should be paid to quantifying the role of non-predation sources of fish mortality in reef ecosystems.

scholarly journals Ontogenetic Shifts in Home Range Size of a Top Predatory Reef-associated Fish (Caranx ignobilis): Implications for Conservation.

2020 ◽  
Author(s):  
Ryan Daly ◽  
John David Filmalter ◽  
Lauren R Peel ◽  
Bruce Quinten Mann ◽  
James Lea ◽  
...  
Keyword(s):  
Home Range ◽  
Juvenile Fish ◽  
Fork Length ◽  
Home Range Size ◽  
Range Size ◽  
Fish Length ◽  
Adult Fish ◽  
Convex Polygons ◽  
Spatial Management ◽  
Wide Range

Abstract Defining the home range of vulnerable species is critical for designing effective spatial management strategies. However, animal home ranges often change with ontogeny and quantifying the associated temporal and spatial changes is particularly challenging for mobile marine species. Here, we investigate how the space use of a top predatory reef-associated fish (Caranx ignobilis) scales with body size. We tagged 17 individuals, representing a wide range of sizes (40.5 – 120 cm fork length (FL)), with acoustic transmitters, and passively tracked them for over 3 years at a tropical island and atoll in the Republic of Seychelles, Western Indian Ocean. We found that a sheltered atoll environment was critical for juvenile fish (< 60 cm FL) that exhibited a shift in home range location and area as they matured into adults. Small (60 – 100 cm FL) and large (> 100 cm FL) adult fish appeared to favour shallow coral reefs and associated reef drop offs whilst sharing a similar core home range location. Large adult fish, however, utilized a greater diversity of habitat types and had significantly (p < 0.05) greater annual dispersal distances (mean = 35.29 km, max = 91.32 km) than small adults (mean = 13.72 km, max = 21.55 km). Additionally, the home range (represented by minimum convex polygons) of large adults (mean = 209.74 km2) was significantly (p < 0.05) larger than that of juveniles (mean = 38.73 km2) and small adults (77.32 km2) and there was a significant (p = 0.02) relationship between fish length and home range size, with fish length accounting for 32% of the home range size variance. Furthermore, tagged fish took up to 34 months (mean = 18.54) to utilize the full extent of their home range. The habitat shift and expansion in home range size throughout ontogeny exhibited by C. ignobilis in this study should be taken into account when designing effective spatial management plans for the species.

Osmotic and Ionic Changes in Blood and Muscle of Migrating Salmonids

1961 ◽  
Vol 38 (2) ◽  
pp. 411-427
Author(s):  
GWYNETH PARRY
Keyword(s):  
Atlantic Salmon ◽  
Fresh Water ◽  
Sea Water ◽  
Juvenile Fish ◽  
Inorganic Ions ◽  
Juvenile Salmon ◽  
Adult Fish ◽  
Extracellular Compartment ◽  
Ionic Changes ◽  
Whole Muscle

1. Osmoregulation of the Atlantic salmon in fresh water and sea water, and during transfers from one salinity to another, has been studied by measuring the freezingpoint and the levels of some inorganic ions in the blood plasma, and water content and ions in whole muscle. 2. An increase in blood concentration of about 12% follows the transfer of juvenile fish (smolts) from fresh water to sea water; and a fall of concentration of about 5% follows the transfer of the adult fish from sea water to fresh water. 3. Some changes in analyses of whole muscle indicate changes in the extracellular compartment during transfers from one salinity to another. 4. Osmoregulatory powers of juvenile salmon (smolts) and fresh-run adults are good, but spent fish (kelts) returning from fresh water to sea water, osmoregulate with difficulty or not at all.

Stability of elemental signatures in the scales of spawning weakfish, Cynoscion regalis

2003 ◽  
Vol 60 (4) ◽  
pp. 361-369 ◽  
Author(s):  
Brian K Wells ◽  
Simon R Thorrold ◽  
Cynthia M Jones
Keyword(s):  
Chesapeake Bay ◽  
Juvenile Fish ◽  
Atlantic Coast ◽  
Age Groups ◽  
Delaware Bay ◽  
Adult Fish ◽  
Juvenile Period ◽  
Cynoscion Regalis ◽  
Natural Tags ◽  
Pamlico Sound

We quantified elemental signatures in scales of ages-1 and -2 weakfish, Cynoscion regalis, collected during the spawning season in Pamlico Sound, Chesapeake Bay, and Delaware Bay in 1998. We compared these signatures with elemental signatures from scales of juvenile weakfish collected while still resident in natal estuaries at five locations along the Atlantic coast in 1996 and 1997. Although Mg/Ca and Mn/Ca were lower in the juvenile portion of scales from adults compared with scales from juvenile fish, Sr/Ca and Ba/Ca were similar in the three age groups. We compared scale and otolith chemistries from juveniles and adults to determine if relative concentrations of elements/Ca in scales remained consistent, even if absolute levels were altered. Scale Mn/Ca and Ba/Ca remained correlated with those in otoliths of adult fish. Finally, we examined the ability of elemental signatures in scales to act as natural tags of natal estuaries in spawning weakfish. Allocation of fish to natal estuaries based on geochemical signatures in scales and otoliths from age-1 fish was similar; however, allocation was different for age-2 fish. Elemental signatures in scales degraded after the juvenile period and after maturation were insufficiently stable for use as a natural tag of natal origins in weakfish.

Sign in / Sign up

Export Citation Format

Share Document