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Trophodynamics Of The Fish Valenciennellus Tripunctulatus. I. Vertical Distribution, Diet And Feeding Chronology, Thomas L. Hopkins, Ronald C. Baird
Trophodynamics Of The Fish Valenciennellus Tripunctulatus. I. Vertical Distribution, Diet And Feeding Chronology, Thomas L. Hopkins, Ronald C. Baird
Marine Science Faculty Publications
The adult and juvenile life stages of the small (~25mm) zooplanktivorous mesopelagic fish Valenciennellus tripunctulatus (Esmark) are found at depths of 200-600m throughout the diel period. Average population density was estimated to be 5 fish (104m3)-1 and the maximum density recorded was 11 fish (104m3)-1. Copepods constituted ~95% of all food items identified and Pleuromamma was the principal forage genus, contributing 31% and 56% to numbers and biomass of food items, respectively. Ontogenetic changes in diet were observed, the percentage of larger copepods increasing in the diet with increasing fish size. Food items …
Trophodynamics Of The Fish Valenciennellus Tripunctulatus. Ii. Selectivity, Grazing Rates And Resource Utilization, R. C. Baird, Thomas L. Hopkins
Trophodynamics Of The Fish Valenciennellus Tripunctulatus. Ii. Selectivity, Grazing Rates And Resource Utilization, R. C. Baird, Thomas L. Hopkins
Marine Science Faculty Publications
Various patterns of resource utilization in the feeding strategy of Valenciennellus tripunctulatus, a small mesopelagic fish of tropical-subtropical oceans, were explored. Ivlev electivity indices suggest that copepods in general and the genus Pleuromamma in particular are being actively selected. Prey-size selection was apparent and strong negative indices were calculated for all plankton smaller than 1 mm. Non-crustacean prey in all size classes also gave negative indices. Strong positive indices were indicated for prey size classes greater than 2 mm. A model was developed to estimate grazing rates and efficiencies which is linearly influenced by swimming speed and plankton abundance, …
Trophodynamics Of The Fish Valenciennellus Tripunctulatus Iii Energetics, Resources And Feeding Strategy, Ronald C. Baird, Thomas L. Hopkins
Trophodynamics Of The Fish Valenciennellus Tripunctulatus Iii Energetics, Resources And Feeding Strategy, Ronald C. Baird, Thomas L. Hopkins
Marine Science Faculty Publications
A model was constructed which relates energy in diet to metabolic requirements for the mesopelagic zooplanktivore fish Valenciennellus tripunctulatus. Linear and Von Bertalanffy growth models were used to explore the energetic consequences of a number of feasible age/growth strategies. Maxlmum efficiencies were obtained with linear growth to about 30 mm in 1 y. Efficiencies declined rapidly for slower growth strategies. It was hypothesized that an 'annual' life history strategy was optimum based on energetic considerations. Copepod prey in the 1-2 mm size class were an order of magnitude more abundant and over 4 times higher in caloric content than …
Scale And Community Structure Of Coral Reef Fishes: A Long-Term Study Of A Large Artificial Reef, John C. Ogden, J. P. Ebersole
Scale And Community Structure Of Coral Reef Fishes: A Long-Term Study Of A Large Artificial Reef, John C. Ogden, J. P. Ebersole
Integrative Biology Faculty and Staff Publications
he fish community of a large artificial reef made In 1960 of 800 concrete blocks in a seagrass bed on the south coast of St. John, U.S. Virgin Islands, was studied by comparing a series of visual censuses (1975-1979) with each other and with a 1962 total-poison station collection (Randall, 1963). Discounting the presence of some cryptic species in the poison station that would not normally be seen in visual censuses (N = 10), as well as discounting seagrass-bed residents and roaming species only transient on the reef (N = 13), all of the censuses and the poison station (range …