CalCOFI

CalCOFI oceanographic survey station grid

CalCOFI (California Cooperative Oceanic Fisheries Investigations) is a multi-agency partnership formed in 1949 to investigate the collapse of the sardine population off California. The organization's members are from NOAA Fisheries Service, Scripps Institution of Oceanography, and California Department of Fish and Wildlife. The scope of this research has evolved into the study of marine ecosystems off California and the management of its fisheries resources. In 2004, the CalCOFI survey area became one of 26 Long Term Ecological Research Network (LTER) research sites. This time-series of oceanographic and fisheries data allows scientists to assess the human impact and effects of climate change on the coastal ocean ecosystem. CalCOFI hydrographic and biological data, publications, and web information are distributed for use without restriction under the terms of the GNU Free Documentation License.

Origin

The Pacific Sardine Fishery was once the largest fishery by volume of the North American Pacific Coast. The fishery developed in the 1920s, peaking in the 1930s with sardine landings reaching over 700,000 tons in California, but was followed by a precipitous collapse in the 1940s.[1] Recommendations and early warnings of a fishery collapse were given throughout the period with an emphasis of setting annual catch limits given by fishery scientists, for example Scofield and Frances Clark.[2][3] Disregarding the early warnings, the Pacific Sardine fishery continued in part driven by the wartime requirement for cheap sources of protein; by the 1940s and 1950s, catches declined by an order of magnitude to 80,000 tons. In the decade that followed, sardine catches continued to decline to 20,000 tons.

The Sardine Fishery collapse was a major catalyst to the development of the California Cooperative Sardine Research Program, a precursor to the CalCOFI program. The consensus concern for the program was whether this collapse was due to increased fishing pressure or environmental change. The program was initially led by Oscar Elton Sette, who forged a collaboration between research institutions (Scripps Institution of Oceanography) and government agencies (California Fish and Game Commission – now the California Department of Fish and Wildlife – and the United States Fish Commission – now known as the NOAA Fisheries Service) with the goal of resource management and fisheries conservation of the Eastern Pacific.[4]

The CalCOFI program was initially met with skepticism. The program was seen as a diversionary tactic initiating further picayune studies of sardine abundance to delay sardine catch regulations.[5] Nevertheless, after the sardine fishery reached a low point in 1947, efforts were focused on the investigation of the underlying forces that govern sardine abundance.[6]

Sampling pattern

The CalCOFI Station pattern was based on a centric-systematic-area design.[7]

CalCOFI sampling lines were designed to be normal to the central California coast centered at Point Conception, designated as CalCOFI Line 80. The original sampling pattern extended from Line 10 at the US-Canada border to Line 120 off Point Eugenia, Baja California, Mexico, with a spacing of 120 miles between lines (i.e. distance between line 80 and 90 is 120 miles). Since its conception, additional lines were added within the domain, creating a 40-mile spacing between lines which are now numbered in fractions of 3's and 7's (80, 83, 87, 90, etc.).[8]

Regular surveying began in 1951; however, CalCOFI data go back to 1949. Like all research and fishery surveys, there are many variables which play a role in the design of the survey pattern. The CalCOFI program has surveyed a wide variety of spatial ranges. Thus, CalCOFI surveys are generally grouped into sampling domains which are commonly covered over the duration of this ecological study[8]

The largest sampling domain, which has been covered multiple times, is the area from the California–Oregon border to the tip of Baja California Sur, Mexico. This region was heavily surveyed in the 1950s (1951, 1952, 1954, 1956, 1958-1960, and 1972). Another large domain runs from San Francisco to southern Baja California (surveyed in 1953, 1955, 1957, 1961–1966, 1968, 1974, 1975, 1978, 1980, and 1981).

The sampling domain extending from San Diego to Avila Beach is today called the "core CalCOFI area". These 66 stations have been covered over the entire time series, with exceptions only due to years where no cruises were conducted. A series of inshore South California Coastal Ocean Observing System (SCCOOS) stations (all at a water depth of approximately 20 m (66 ft)) were added to the core CalCOFI pattern in 2004, resulting in a 75-station pattern.

Less common sampling patterns of intermediate domain have also been conducted. This includes a survey region from San Francisco to San Diego, which has become increasingly sampled during the spring survey because the domain covers an expanded region of known sardine spawning grounds. The data from these spring cruise are heavily relied upon for sardine stock assessment and other related research.

Every line apart from the CalCOFI sampling scheme and its corresponding stations has experienced some degree of difference and variation in spatial and temporal sampling frequency. Furthermore, technological advances have allowed increasing amounts of new chemical, physical, and biological properties to be measured within the water column. Line 90, which is a part of the core CalCOFI station domain positioned across the mid-Southern California Bight, is the best-sampled and most visited line in the time series. The data from Line 90 is used in many transect figures and analyses.

There are a variety of similar survey programs collecting analogous data across the west coast. These programs range in temporal and spatial extent. One such program is the Investigaciones Mexicanas de la Corriente de California (IMECOCAL) program out of Mexico, which samples the Eastern Pacific around Baja California.[9][10][11]

Gear used

A variety of nets and related instrumentation have been deployed on CalCOFI cruises over the years. Many of these have been developed for use by the CalCOFI program. Oblique tows using a Bongo net are employed to sample for micronekton, mesozooplankton and ichthyoplankton. Vertical tows for icthyoplankton and mesozooplankton are conducted using a Pairovet and PRPOOS Net. Finally, surface tows with a Manta net are used to sample neuston. Supplementary sampling focuses on collection of juvenile and small fish via trawling techniques. This includes using a Modified Isaacs Kidd Net, a Matsuda Oozeki Hu trawl (MOHT), and the Nordic rope trawl.

CalCOFI nets

CalCOFI nets
Net Name Description
Bongo Net Paired ringed nets towed obliquely from a depth of approx. 210 m to the surface with ship speed at approx. 1-2 knots. Water is filtered through the 505 micron nylon mesh nets with a mouth diameter of 0.71 m.[8][12] The right side net is preserved in buffered 5% formalin and the left side in 90% ethanol. The Bongo Net is designed to collect mesozooplankton and its samples are critical in determining egg and larval mortality. The data are used in the Daily Egg Production Method for estimating the spawning stock biomass of sardine.[13][14][15] The net functions more efficiently at night due to the decreased net avoidance by zooplankton.[16][17] Tow depth, net configuration, mesh size and materials have evolved since the program began. Comparisons of different net methodology and potential ramifications have been published.[8][18]
Pairovet The Pairovet is used to collect ichthyoplankton via vertical tows from 70 m to the sea-surface using paired 0.05 m2 150 micron nylon mesh nets. The smaller nylon mesh is specially designed to retain fish eggs which are found in the upper 70 m.[19][20] The net is employed specifically to collect anchovy eggs with 100% efficiency.[21] The aim of the Pairovet is to sample a constant volume of water at each site, thus it is crucial to keep the net straight up and down. Ship pitch and roll, water currents, net clogs, wire angle, and dragging in the neuston layer all are possible sources of variance and error. These potential variables may force sample out of the mouth of the device, and/or sample loss due to destruction of eggs.[22]
Manta Net The Manta Net was developed to sample the sea-surface over a range of oceanic conditions. The net is towed beside the vessel to avoid ship wake, and the mouth is unobstructed by a bridle that might cause avoidance by organisms.[23] The net collects neuston, or the animals found on the sea-surface, via filtering water over a 505 micron net fixed with a 333 micron cod-end. A variety of fish species have a prolonged transformation between larval and juvenile stages of development during which time the organisms can be found in the surface layer.

Supplementary nets

Supplementary nets
Net Name Description
Nordic Surface Trawl Trawl aimed to sample and collect pelagic fish.[24] Samples the water using wide trawl doors with a 600 m2 mouth area filtering water with an 8 mm mesh. The net retains juveniles and certain large larval fish. Recently the net has been fastened with a marine mammal excluder device (MMEL) to decrease the amount of mammalian impact and mortality.[25] Data retrieved by the net is used to better understand fishery species spawning stock biomass, in particular the data is important for the Daily Egg Production Method as it samples a wide distribution of species and size-classes.[14][26] Additionally, size structure data is paramount in the use of acoustic biomass estimates.[27]
Modified Isaacs Kidd Trawl Trawl designed to sample juvenile pelagic fish which can avoid other sampling nets by mid-water trawls. The primary target is mid-sized anchovy (15 – 60 mm).[28] The frame samples a large volume of water while minimizing avoidance by the target organisms. The net filters about 7,000 m3 or 100 times as much water per tow as a standard bongo net.[28]
Matsuda-Oozeki-Hu (MOHT) Trawl Trawl designed to capture a multitude of mesopelagic organisms including: krill, late larval and juvenile fishes, and micronekton. Collects juvenile and small fish assemblages in conjunction with multifrequency acoustics to estimate the distribution and biomass of sampled species. The MOHT has a 5.5 m2 mouth opening, and filters the water at up to 4.5 knots in a variety of oceanic conditions. The MOHT is fixed with a range of cod-end filters to sample a variety of different size classes. It samples the mesopelagic community in a better manner then the bongo or the rope trawl and its data is highly valuable in the determination of health and abundance of important fisheries.[29]
PRPOOS The name of the PRPOOS net is derived from its use during the Planktonic Rate Processes in Oligotrophic Ocean Systems program. It was formerly known as the Soutar-Hemmigway Animal Trap or “SHAT”. The net was introduced to CalCOFI cruises by the CCE-LTER program and it is a net designed to sample zooplankton using a 202 micron mesh net with a 50 cm diameter. The net is towed vertically to a depth of 210 m.[8]
Continuous Underway Fish Egg Sampler (CUFES) Developed in the mid-1990s to identify fish eggs using video/optical plankton counter. The sampler functions by constantly pumping water from about 3 m depth. The water passes through a variety of sampling collectors including an optical plankton counter.[30] Conceived to automate the collection and sorting of fish species, but though it gave promising results, manual identification is still required of the samples to minimize error and misidentification.[31] The problem is that many pelagic fish eggs share similar optical properties with copepods. Despite this hiccup, the CUFES is invaluable in the sampling of sardine and anchovy habitats.[30] CUFES data from cruises are commonly used with surface temperature and salinity data to show water mass characteristics where sardine, anchovy, and other important fishery species spawn.[31] The common use of the CUFES at sea is to inform where patches of high egg density are located which can be sampled via nets. The CUFES also impacts the relative confidence level of net sampling.[32] A variety of research is conducted to determine the relationship between CUFES egg data and net (Pairvet, PRPOOS, etc.) sampled data. Confidence in relations determined is still in question. Thus, CUFES data alone cannot be used to determine estimates of stock biomass.[30] Nevertheless, the CUFES is an important tool in describing surface patchiness, providing extra data by designating an area as high or low surface egg density.[32]

See also

Further Information

References

  1. ^ Radovich, J.: “The collapse of the California sardine fishery.” Archived 2013-11-05 at the Wayback Machine What have we learned? California Cooperative Oceanic Fisheries Investigations 23, 56–78 (1982)
  2. ^ Scofield, N.: Report of the Bureau of Commercial Fisheries. Thirty-first biennial report for the years 1928-1930. Tech. rep., California Division of Fish and Game (1931)
  3. ^ Clark, F.: Measures of abundance of the sardine, Sardinops caerulea, in California waters. Fishery Bulletin California Division of Fish and Game 53 (1939)
  4. ^ Kendall Jr., A., Duker, G.: “The development of recruitment fisheries oceanography in the United States.” Fisheries Oceanography 7(2), 69–88 (1998)
  5. ^ Scofield, W.: Marine fisheries dates. On file at California State Fisheries Laboratory, Long Beach, California
  6. ^ “Marine Research Committee: California Cooperative Sardine Research Program, Progress report 1950.” California Cooperative Oceanic Fisheries Investigations Reports 1 (1950)
  7. ^ Milne, A.: “The centric systematic area sample treated as a random sample.” Biometrics 15(2), 270–297 (1959)
  8. ^ a b c d e Kramer, D., Kalin, M., Stevens, E., Thrailkill, J., Zweifel, J.: “Collecting and processing data on fish eggs and larvae in the California Current region.” NOAA Technical Report NMFS CIRC-370 (1972)
  9. ^ Barlow, J., Henry, A., Redfern, J., Yack, T., Jackson, A., Hall, C., Archer, E., Ballance, L.: “Oregon, California and Washington line-transect and ecosystem (ORCAWALE) 2008 cruise report.” NOAA Technical Memorandum NMFS NOAA-TM-NMFS-SWFSC-465, 33 p, U.S. Department of Commerce (2010)
  10. ^ Baumgartner, T., Durazo, R., Lavaniegos, B., Gaxiola, G., Gomez, G., Garcia, J.: “Ten years of change from IMECOCAL observations in the southern region of the California Current ecosystem.” In: GLOBEC International Newsletter, vol. 14, pp. 43–54. GLOBEC (2008)
  11. ^ Emmett, R., Brodeur, R., Miller, T., Pool, S., Krutzikowsky, G., Bentley, P., McCrae, J.: “Pacific sardine (Sardinops sagax) abundance, distribution, and ecological relationships in the Pacific northwest.” Archived 2013-12-03 at the Wayback Machine California Cooperative Oceanic Fisheries Investigations Reports 46, 122–143 (2005)
  12. ^ Smith, P., Richardson, S.: “Standard techniques for pelagic fish egg and larva surveys.” FAO Fisheries Technical Paper 175, Food and Agriculture Organization of the United Nations (1977)
  13. ^ Lo, N., Hunter, J., Hewitt, R.: “Precision and bias estimates of larval mortality.” Fishery Bulletin of the United States 87, 399–416 (1989)
  14. ^ a b Lo, N., Griffith, D., Macewicz, B.: “Spawning biomass of Pacific sardine (Sardinops sagax) from 1994-2004 off California.”[permanent dead link‍] California Cooperative Oceanic Fisheries Investigations Reports 46, 93–112 (2005)
  15. ^ Lo, C., Macewicz, B., Griffith, D.: “Biomass and reproduction of Pacific sardine (Sardinops sagax) off the Pacific northwestern United States, 2003-2005.” Fishery Bulletin of the United States 108(2), 174–192 (2010)
  16. ^ Ohman, M., Smith, P.: “A comparison of zooplankton sampling methods in the CalCOFI time series.” California Cooperative Oceanic Fisheries Investigations Reports 36, 153–158 (1995)
  17. ^ Lavaniegos, B., Ohman, B.: “Long-term changes in pelagic tunicates of the California Current.” Deep-Sea Research Part II 50, 2473–2498, DOI:10.1016/S0967–0645(03)00,132–2 (2003)
  18. ^ Ahlstrom, E.H.: “Distribution and abundance of egg and larval populations of the Pacific sardine.” Fishery Bulletin of the United States 56(93), 81–140 (1954)
  19. ^ Ahlstrom, E.: “Vertical distribution of pelagic fish eggs and larvae off California and Baja California.” United States Fish and Wildlife Service Fishery Bulletin 60, 107–146 (1959)
  20. ^ Moser, H., Pommeranz, T.: “Vertical distribution of eggs and larvae of northern anchovy, Engraulis mordax, and of the larvae of associated fishes at two sites in the Southern California Bight.” Fishery Bulletin of the United States 97, 920–943 (1998)
  21. ^ Smith, P., Flerx, W., Hewitt, R.: “The CalCOFI vertical egg tow (CalVET) net. Reuben Lasker (ed.), An egg production method for estimating spawning biomass of pelagic fish: Application to the northern anchovy, Engraulis mordax.” U.S. Department of Commerce, NOAA Technical Report NMFS-36, pp. 27-32. (1985)
  22. ^ Hewitt, R.: “Roll, heave and vertical ichthyoplankton tows.” Ocean Science and Engineering 8, 41–51 (1983)
  23. ^ Brown, D., Cheng, L.: “New net for sampling the ocean surface.” Marine Ecology Progress Series 5, 225–227 (1981)
  24. ^ Griffith, D.: Collecting Adult Coastal Pelagic Fish Using the Nordic 264 Rope Trawl: A Guide to Deployment and Sample Processing. Unpublished. Mimeo, 12pp, Department of Commerce, NOAA, Southwest Fisheries Science Center (2008)
  25. ^ Dotson, R., Griffith, D., King, D., Emmett, R.: “Evaluation of a marine mammal excluder device (MMED) for a Nordic 264 midwater rope trawl.” Technical memorandum NMFS, NOAA-TM-NMFS-SWFSC-455, 14 p., U.S. Department of Commerce, NOAA (2010)
  26. ^ Lasker, R.: “An egg production method for estimating spawning biomass of pelagic fish: application to northern anchovy, Engraulis mordax.” NOAA Technical Report, NMFS 36 (1985)
  27. ^ Zwolinski, J., Demer, D., Byers, K., Cutter, G., Renfree, J., Sessions, T., Macewicz, B.: “Distribution and abundances of Pacific sardine (Sardinops sagax) and other pelagic fishes in the California Current ecosystem during spring 2006, 2008 and 2010, estimated from acoustic trawl surveys.” Fishery Bulletin of the United States 110, 110–122 (2012)
  28. ^ a b Methot, R.: “Frame trawl for sampling pelagic juvenile fish.” California Cooperative Oceanic Fisheries Investigations Reports 27, 267–278 (1986)
  29. ^ Oozeki, Y., Hu, F., Kubota, H., Sugisaki, H., Kimura, R.: “Newly designed quantitative frame trawl for sampling larval and juvenile pelagic fish.” Fisheries Science 70, 223–232 (2004)
  30. ^ a b c Checkley Jr., D., Ortner, P., Settle, L., Cummings, S.: “A continuous underway fish egg sampler.” Fisheries Oceanography 6, 58–73 (1997)
  31. ^ a b Checkley Jr, D., Dotson, R., Griffith, D.: “Continuous underway sampling of eggs of Pacific sardine (Sardinops sagax) and northern anchovy (Engraulis mordax) in spring 1996 and 1997 off southern and central California.” Archived 2013-12-03 at the Wayback Machine Deep-Sea Research 47, 1139–1155 (2000)
  32. ^ a b Lo, N., Hunter, J., Charter, R.: “Use of a continuous egg sampler for ichthyoplankton surveys: application to the estimation of daily egg production of Pacific sardine (Sardinops sagax) off California.” Fishery Bulletin of the United States 99, 554–571 (2001)

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