Research Interests:
Research Interests: Geography, Mathematics, Environmental Science, Economics, Macroeconomics, and 15 moreStatistics, Fisheries Science, Biology, Productivity, Ecology, Fisheries Management, Biodiversity, Environmental Resource Management, Fishing, Habitat, Conservation letters, Fishery, Sample Size Determination, Marine Protected Area, and Marine Reserve
Research Interests: Sociology, Geography, Demography, Biology, Ecology, and 4 morePopulation, Fishing, Commercial fishing, and Fishery
Research Interests:
Unlike several boom-and-bust fisheries of the last century, the recreational saltwater bass (Paralabrax spp.) fishery in southern California has endured oceanographic regime cycles and nearly a century of increasing anthropogenic impacts.... more
Unlike several boom-and-bust fisheries of the last century, the recreational saltwater bass (Paralabrax spp.) fishery in southern California has endured oceanographic regime cycles and nearly a century of increasing anthropogenic impacts. We examined regulatory changes and several fishery-dependent and fishery-independent time series to determine historical influences on the fishery and causes of dramatic catch declines in recent years. Our results reveal a complex relationship between bass abundance and harvest rules, fishery recruitment, giant kelp (Macrocystis pyrifera), ocean regimes, and fishing. Recent trends in larval abundance and lengths of harvested fish suggest recruitment failure occurred during the last oceanographic regime shift coincident with a peak in exploitation rates. We believe this contributed to poor fishery recruitment, associated declines in catch-per-unit-effort, and a depressed population since the mid-2000s. Although long-standing regulations and periods ...
Research Interests:
Research Interests:
Research Interests:
In order to determine the ecological importance of California oil platforms for many economically important fishes, knowledge of their site fidelity and movements around platforms is essential. We determined the degree of site fidelity of... more
In order to determine the ecological importance of California oil platforms for many economically important fishes, knowledge of their site fidelity and movements around platforms is essential. We determined the degree of site fidelity of 100 platform-associated fishes, across 15 species at three POCS platforms in the east Santa Barbara Channel using acoustic telemetry monitoring. Thirty percent of the fish tagged were not detected after the first six days following release and were assumed to have died or immediately emigrated away from platforms. Degrees of site fidelity varied widely among individuals, among species, and between platforms. Of the most abundant species tagged (cabezon, vermilion, widow, copper, and greenspotted rockfish), widow rockfish showed a high probability of being detected at platforms over a 2-year period. Vermilion rockfish emigrated away from the shallower Platform Gilda (64 m) faster than vermilion rockfish tagged at the deeper Platform Grace (93 m). Te...
Research Interests:
Barred sand bass, Paralabrax nebulifer, have been and continue to be, one of the most sought after gamefish in southern California waters. The majority of landings occur when individuals move away from nearshore reef habitats to their... more
Barred sand bass, Paralabrax nebulifer, have been and continue to be, one of the most sought after gamefish in southern California waters. The majority of landings occur when individuals move away from nearshore reef habitats to their offshore summer spawning grounds. Active acoustic telemetry was used to quantify fine-scale horizontal and vertical movement patterns of barred sand bass within one known spawning aggregation location, the Huntington Beach Flats, California. Fish were internally fitted with either Vemco V13 pingers or V13P depth sensor transmitters. Individuals were actively tracked over multiple nonconsecutive 24 hr periods; transmitter battery life ranged from 14 d to 4 mo depending on transmitter type. Several individuals left the spawning site for several weeks and were relocated 0.5-3.0 km from last known detection. Data suggests both transient and resident individuals use the Huntington Flats spawning ground, with some fish potentially transiting between their ho...
Research Interests:
Two experiments were used to assess the effects of barotrauma on initial capture survival and short-term postrecompression survival of line-caught (range 18–225 m) southern California rockfish ( Sebastes spp.). Occurrence of external and... more
Two experiments were used to assess the effects of barotrauma on initial capture survival and short-term postrecompression survival of line-caught (range 18–225 m) southern California rockfish ( Sebastes spp.). Occurrence of external and internal signs of barotrauma was characterized across all species. Despite species-specific differences in the extent of barotrauma observed, initial capture survival of rockfish held in a live well for a 10-min period following capture was 68% overall (19 species, n = 168). Overall 2-day survival of rockfish following recompression in cages was also 68% (17 species, n = 257). Short-term survival varied across species (range 36% to 82%), as did the occurrence of external signs of barotrauma. The degree of external signs of barotrauma was not a significant predictor of initial capture survival or short-term survival. The most significant predictor of short-term survival was surface holding time, with short-term survival increasing with decreasing sur...
Research Interests:
Research Interests:
Page 1. JARVIS ET AL.: RECREATIONAL FISH CATCH TRENDS CalCOFI Rep., Vol. 45, 2004 COMPARISON OF RECREATIONAL FISH CATCH TRENDS TO ENVIRONMENT-SPECIES RELATIONSHIPS AND FISHERY-INDEPENDENT ...
Research Interests:
Research Interests:
Research Interests:
The recreational fishery for Barred Sand Bass (Paralabrax nebulifer) has recently shown declines in catch prompting a need for updating life-history attributes. The objective of this study was to provide a more extensive and current... more
The recreational fishery for Barred Sand Bass (Paralabrax nebulifer) has recently shown declines in catch prompting a need for updating life-history attributes. The objective of this study was to provide a more extensive and current examination of Barred Sand Bass age and growth. Fish were collected from the southern California bight from 2011 to 2015. Using Akaike Information Criteria analysis we determined that the three-parameter von Bertalanffy growth model was the best fit out of the four tested models (Gompertz, Logistic, Power, and von Bertalanffy). Males grew slightly quicker than females (k, males = 0.10, females = 0.08). Males and females did not differ in length, weight, or the length-weight relationship. We also validated yearly banding of Barred Sand Bass with oxytetracycline marking of two fish in captivity for one year. Location of the first annulus was also validated with otolith diameter measurements. Finally, we compared the current study to a past 1990’s study and...
Recent marine spatial planning efforts, including the management and monitoring of marine protected areas (MPAs), increasingly focus on the importance of stakeholder engagement. For nearly 15 years, the California Collaborative Fisheries... more
Recent marine spatial planning efforts, including the management and monitoring of marine protected areas (MPAs), increasingly focus on the importance of stakeholder engagement. For nearly 15 years, the California Collaborative Fisheries Research Program (CCFRP) has partnered volunteer anglers with researchers, the fishing industry, and resource managers to monitor groundfishes in California’s network of MPAs. While the program has succeeded in generating sustained biological observations, we know little about volunteer angler demography or the impact of participation on their perceptions and opinions on fisheries data or MPAs. In this study we surveyed CCFRP volunteers to learn about (a) volunteer angler demographics and attitudes toward groundfish management and stock health, (b) volunteer angler motivations for joining and staying in the program, and (c) whether participation in the program influenced volunteer angler opinions on the quality of fisheries data used in resource man...