Description of economic data collected with a random sample of commercial reef fish boats in the Florida Keys

This study summarizes the results of a survey designed to provide economic information about the financial status of commercial reef fish boats with homeports in the Florida Keys. A survey questionnaire was administered in the summer and fall of 1994 by interviewers in face-to-face meetings with owners or operators of randomly selected boats. Fishermen were asked for background information about themselves and their boats, their capital investments in boats and equipment, and about their average catches, revenues, and costs per trip for their two most important kinds of fishing trips during 1993 for species in the reef fish fishery. Respondents were characterized with regard to their dependence on the reef fish fishery as a source of household income. Boats were described in terms of their physical and financial characteristics. Different kinds of fishing trips were identified by the species that generated the greatest revenue. Trips were grouped into the following categories: yellowtail snapper (Ocyurus chrysurus); mutton snapper (Lutjanus analis), black grouper (Mycteroperca bonaci), or red grouper (Epinephelus morio); gray snapper (Lutjanus griseus); deeper water groupers and tilefishes; greater amberjack (Seriola dumerili); spiny lobster (Panulirus argus); king mackerel (Scomberomorus cavalla); and dolphin (Coryphaena hippurus). Average catches, revenues, routine trip costs, and net operating revenues per boat per trip and per boat per year were estimated for each category of fishing trips. In addition to its descriptive value, data collected during this study will aid in future examinations of the economic effects of various regulations on commercial reef fish fishermen.(PDF file contains 48 pages.

The Hidden Cost of Overfishing To Commercial Fishermen: A 2009 Snapshot of Lost Revenues

Ocean fish populations are a vital renewable resource for human populations, providing food,employment and recreation, as well as contributing to global biodiversity. Unfortunately, due to overfishing, environmental degradation, climate change and other stressors, many fish stocks worldwide are in considerable decline.Biological overfishing occurs when fishing rates exceed population growth rates. The resulting declines in fish populations can impact the economy at large. This study analyzes one important component of the costs of overfishing: forgone revenues from lost commercial fisheries harvests due to years of continuedstock depletion, or historic overfishing. It estimates the present annual forgone revenue of overfishing for three regions in the United States: New England, the South Atlantic and the Gulf of Mexico. These regions were chosen for analysis because they are grappling with the effects of historic overfishing and therefore have a significant number of overfished stocks. The 20 stocks included in this analysis are federally managed stocks particular to each region that are included in the Fish Stock Sustainability Index and are currently classified by the National Marine Fisheries Service as "overfished." A stock that is classified as overfished is defined as having a biomass level below a biological threshold specified in its fishery management plan.Overfishing means fewer fish are available to catch in future years. The annual forgone revenue of historic overfishing, therefore, is an estimate of the value of lost catch in a given year due to overfishing. To arrive at the catch loss for each fishery, we first estimated the potential landings of each overfished stock as if it were at healthy levels, and compared those estimates directly to current landings values. We measured potential landings for each fish stock on the basis of optimal yield, and examined four approximations of optimal yield. Our estimates of commercial catch losses are for 2009, the most recent year for which all necessary data were available.Based on our estimates, the aggregate catch loss summed over all three regions in 2009 was $164.2 million. Under a less-conservative approximation of optimal yield, commercial catch loss across all three regions in 2009 was estimated at$222.5 million. Across all three regions, we demonstrated that only 20 to 29 percent of potential landings in 2009 were realized in actual landings. We found the commercial catch loss ($149 million) to be greatest in New England, where there are more overfished species than in any other region in the United States. In the Gulf of Mexico and South Atlantic regions, where large catch allocations are apportioned to recreational fishing, and therefore not accounted for in this analysis, commercial catch losses were lower but still significant. Commercial catch loss in the Gulf of Mexico and the South Atlantic regions were$12.3 million and $2.9 million, respectively.Our estimates of losses resulting from historic overfishing apply to commercial landings only, and do not account for the backward-linked economic impacts of commercial harvest, nor the forward-linked economic activity that would have resulted from the processing and retail sale of these potential catches. Additionally, there are further economic losses beyond the commercial sector in other industries, such as recreational fishing, and there are costs associated with negative impacts to food security, biodiversity and other ecosystem services that are not addressed in this analysis. Commercial catch losses are onesignificant component of the total economic costs of overfishing. Estimates of commercial catch loss we find in this study provide a strong economic argument in support of maintaining healthy fish populations and avoiding delays in rebuilding stocks currently subject to overfishing and/or classified as overfished.

Movement of yellowtail snapper (Ocyurus chrysurus Block 1790) and black grouper (Mycteroperca bonaci Poey 1860) in the northern Florida Keys National Marine Sanctuary as determined by acoustic telemetry

We tagged a total of 14 yellowtail snapper (Ocyurus chrysurus Bloch 1790) and black grouper (Mycteroperca bonaci Poey 1860) inside the Conch Reef Research Only Area (a no-take marine reserve) in the northern Florida Keys National Marine Sanctuary in November 2001. Both species are heavily exploited in the region. Our objective was to characterize site fidelity and movement behavior along the reef tract to the north and south of the release point. Fishes were collected by baited hook and line from the surface, surgically-tagged with coded-acoustic transmitters, and returned to the reef by snorkelers. Tracking of fish movement behavior was conducted by five acoustic receivers deployed on the seafloor from Davis Reef in the south to Pickles Reef in the north. Fishes were tracked for up to eight months. Results indicated that the majority of signal detections for individual fish from both species were recorded at the two Conch Reef receivers. Limited movement from Conch Reef to Davis Reef was recorded, but no signal detections were recorded at the two sites to the north of Conch Reef. These results suggest that both species show site fidelity to Conch Reef. Future studies will seek to characterize this site fidelity with increased temporal and spatial resolution at Conch Reef. (PDF contains 25 pages.

The ecological basis of fishery yield of the Puerto Rico-Virgin Islands Insular Shelf: 1987 Assessment

A literature review was conducted to locate information on the flow of energy from primary producers to the fishery stocks of the Puerto Rican-Virgin Islands insular shelf. This report uses site-specific information to describe the major ecological subsystems, or habitats, of the region, to identify the more common species and the subsystems in which they occur, to quantify productivity and biomass, and to outline trophic relationships. Discussions on each topic and subsystem vary in substance and detail, being limited by the availability and accessibility of information. (PDF contains 189 pages) Seven distinct subsystems are described: mangrove estuary, seagrass bed, coral reef, algal plain, sand/mud bottom, shelf break, and overlying pelagic. Over 50 tables provide lists of species found in each habitat on various surveys dating back to 1956. Estimates of density, relative abundance, and productivity are provided when possible. We evaluated whether sufficient information exists to support an analysis of the energy basis of fishery production in the area, beginning with the design and development of an ecosystem model. Data needs in three categories - species lists, biomass, and trophic relations - were examined for each subsystem and for each of three species groups - primary producers, invertebrates, and fish. We concluded that adequate data, sufficient for modeling purposes, are available in 16 (25%) of 64 categories; limited data, those requiring greater extrapolation, are available in 35 (55%) categories; and no data are available in 13 (20%) categories. The best-studied subsystems are seagrass beds and coral reefs, with at least limited data in all categories. Invertebrates, the intermediate link in the food web between primary producers and fishes, are the least quantified group in the region. Primary production and fishes, however, are relatively well-studied, providing sufficient data to support an ecosystem-level analysis and to initiate a modeling effort

Testing Potential Fish Fraud in Community-Supported Fisheries

The seafood industry has long been plagued by the substitution of a species under a false label. Seafood mislabeling is a major concern in the management of fish and marine species. Incorrect labels hamper the ability to estimate stock size effectively, reduce consumer choice, and represent potential health hazards. The rates of seafood fraudulence have been shown to differ across businesses and markets, and in recent years, community-supported fishery programs (CSFs) have sprung up as an alternative to fish markets and grocery stores. Using genetic analysis, I show that 17 out of 41 (41.5%) samples examined from multiple markets in New Hampshire and Maine were fraudulent. The rates of fraudulent labeling differed across species and across markets, with community-supported fishery programs having the lowest levels of fraud (3 out of 10 samples, 30%) followed by restaurants (33%), fish markets (44%), sushi restaurants (50%) and grocery stores (58%). While the different levels of fraudulence between CSFs and other markets were not found to be statistically significant (p=0.36), my findings should warrant future studies with a larger sample of CSFs to determine the extent to which CSFs can help reduce seafood fraudulence

Diet composition and food habits of demersal and pelagic marine fishes from Terengganu waters, east coast of Peninsular Malaysia

Fish stomachs from 18 demersal and pelagic fishes from the coast of Terengganu in Malaysia were examined. The components of the fishes’ diets varied in number, weight, and their frequency of occurrence. The major food items in the stomachs of each species were determined using an Index of Relative Importance. A conceptual food web structure indicates that fish species in the study area can be classified into three predatory groups: (1) predators on largely planktivorous or pelagic species; (2) predators on largely benthophagous or demersal species; and (3) mixed feeders that consume both pelagic and demersal species

Habitat connectivity in reef fish communities and marine reserve design in Old Providence-Santa Catalina, Colombia

On the insular platform of Old Providence/Santa Catalina, Colombia, we compared nearshore lagoonal patch reefs to those on the northern bank distant from the islands to determine the importance of habitat connectivity to fish community structure. Nearshore patch reefs had greater proximity to mangrove, seagrass and rocky shore habitats, and they had significantly more individuals. Nearshore reefs also tended to have a greater total biomass, more species, a higher proportion of predators of mobile invertebrates and small fishes, and a lower proportion of herbivores. Biomass of snappers and grunts at nearshore sites was four times greater compared to bank sites, and was correlated with the amount of seagrass and sand/rubble habitat within 500 m of each patch reef. We also compared length-frequency distributions and abundances of grunts and snappers among all sites (deep and shallow forereefs, patch reefs and deep and shallow leeside slopes). The results were consistent with ontogenetic migrations from shallow sites, primarily seagrass and mangrove habitats, to deeper sites and to those further out on the bank. The evidence suggests that species differed in both distance and direction of dispersal, which may be affected by the abundance and distribution of preferred habitats. Marine reserves near the islands should target nearshore nursery areas and patch reefs harboring species of limited dispersal capability. Reserves on the northern bank would protect spawners of those species showing the greatest dispersal capability

Distribution and sighting frequency of reef fishes in the Florida Keys National Marine Sanctuary

This study analyzed species richness, distribution, and sighting frequency of selected reef fishes to describe species assemblage composition, abundance, and spatial distribution patterns among sites and regions (Upper Keys, Middle Keys, Lower Keys, and Dry Tortugas) within the Florida Keys National Marine Sanctuary (FKNMS) barrier reef ecosystem. Data were obtained from the Reef Environmental Education Foundation (REEF) Fish Survey Project, a volunteer fish-monitoring program. A total of 4,324 visual fish surveys conducted at 112 sites throughout the FKNMS were used in these analyses. The data set contained sighting information on 341 fish species comprising 68 families. Species richness was generally highest in the Upper Keys sites (maximum was 220 species at Molasses Reef) and lowest in the Dry Tortugas sites. Encounter rates differed among regions, with the Dry Tortugas having the highest rate, potentially a result of differences in the evenness in fishes and the lower diversity of habitat types in the Dry Tortugas region. Geographic coverage maps were developed for 29 frequently observed species. Fourteen of these species showed significant regional variation in mean sighting frequency (%SF). Six species had significantly lower mean %SF and eight species had significantly higher mean %SF in the Dry Tortugas compared with other regions. Hierarchical clustering based on species composition (presence-absence) and species % SF revealed interesting patterns of similarities among sites that varied across spatial scales. Results presented here indicate that phenomena affecting reef fish composition in the FKNMS operate at multiple spatial scales, including a biogeographic scale that defines the character of the region as a whole, a reef scale (~50-100 km) that include meso-scale physical oceanographic processes and regional variation in reef structure and associated reef habitats, and a local scale that includes level of protection, cross-shelf location and a suite of physical characteristics of a given reef. It is likely that at both regional and local scales, species habitat requirements strongly influence the patterns revealed in this study, and are particularly limiting for species that are less frequently observed in the Dry Tortugas. The results of this report serve as a benchmark for the current status of the reef fishes in the FKNMS. In addition, these data provide the basis for analyses on reserve effects and the biogeographic coupling of benthic habitats and fish assemblages that are currently underway. (PDF contains 61 pages.

Coastal Capital: Dominican Republic: Case Studies on the Economic Value of Coastal Ecosystems in the Dominican Republic

Illustrates the benefits coralline beaches, reefs, and mangroves in various parts of the country offer, including providing protection against beach erosion, habitats for fisheries, potential tourism growth in protected marine areas, and local tourism

Fish assemblages and indicator species: reef fishes off the southeastern United States

For many fish stocks, resource management cannot be based on stock assessment because data are insufficient-a situation that requires alternative approaches to management. One possible approach is to manage data-limited stocks as part of an assemblage and to determine the status of the entire unit by a data-rich indicator species. The utility of this approach was evaluated in analyses of 15 years of commercial and 34 years of recreational logbook data from reef fisheries off the southeastern United States coast. Multivariate statistical analyses successfully revealed three primary assemblages. Within assemblages, however, there was little evidence of synchrony in population dynamics of member species, and thus, no support for the use of indicator species. Nonetheless, assemblages could prove useful as management units. Their identification offers opportunities for implementing management to address such ecological considerations as bycatch and species interrelations