Pacific Sardine

The Science

Overcrowded classrooms: The Pacific sardine forms schools of up to 10 million fish

The Fishery

The sardine fishery collapse of the 1950’s may not have been solely due to overfishing as was long thought, but due to climate change and/or natural long-term fluctuations of fish populations

The Seafood

Sardine is considered one of the healthiest foods in the world!

The Science

USFWS

Taxonomic description

  • Small schooling fish with a silver body and dark spots on its back
  • Can grow to 16” (41 cm) long, but are regularly seen less than 12” (30 cm)
  • One of the 18 species of the herring family found worldwide [1]
  • At times as been the most abundant fish species in the California Current [1]

Distribution

  • Worldwide, found in the subtropical and temperate waters of the Pacific and Indian Oceans and in the Atlantic by South Africa [2]
  • Along western North America, found from the Gulf of California to southeastern Alaska [1]

Life history

  • Can live as long as 14 years old, however, 90% of the population is younger than 6 years old. [1]
  • Sardine matures when smaller and by age 1 during years of low total biomass, and when larger and older (≥2 yrs old) in years of high total biomass  [1]
  • Spawning occurs in schools in the upper 50 m (165 ft) of the water column [1]
  • Most spawning occurs between 13°-17° C (55° - 63° F), with shifts northward and lasting for longer periods during warmer conditions
  • Peaks in spawning are April - August in the north, and January – April in southern California 

Habitat

  • A temperate, coastal pelagic fish (i.e., open water) [1].
  • Migratory, traveling in very large schools but are an important prey item for marine life such as birds and larger pelagic fish [1]
  • Filter feeders that feed on phytoplankton and zooplankton [2]

The Fishery

THDM

Seasonal availability

  • Fishery open year-round [4]
  • Landings fluctuate due to shifting environmental conditions associated with Pacific Decadal Oscillation & changes in sea surface temperature [5]

Managing authority

  • NOAA Fisheries Service manages the fishery under the Coastal Pelagic Species Fisheries Management Plan, which was implemented by the Pacific Fishery Management Council (PFMC)  [6]

Gear type

  • Round haul gear (purse seines, drum seines, & lampara nets) used to encircle schools [6]
  • Seines/nets are dragged through the water column, limiting the potential for disrupting the ocean bottom [5]

Status of the fishery

  • NMFS Fish Stock Sustainability Index classifies the stock as a “4” out of 4, reflecting that the stock has known status, is not overfished or subject to overfishing, & maintains a biomass at or above maximum sustainable yield [7].
  • Fishery declined and collapsed from the late 1940’s to late 1980’s due to several heavily-debated factors. In 1999 after a moratorium, the fishery was deemed “fully recovered” [6]
  • The PFMC sets an overfishing limit, an acceptable biological catch, & an annual catch target [4].

Potential ecosystem impacts

  • Although fishing efforts may catch non-target species, most are sold for human consumption (i.e. Pacific Mackerel); discarded “bycatch” makes up <1% of landings [5]
  • A significant reduction in the amount of forage fish biomass, such as sardines, can disrupt ecosystem functioning given that they transfer plankton into a food source for higher trophic level organisms [5]
  • Sardine biomass is negatively correlated with that of anchovy, which flourish under “warm regime” Pacific Decadal Oscillation conditions. If sardine stocks are low enough, anchovies may fill the vacant ecological niche [5].

The Seafood

cooking.nytimes.com

Edible portions

  • May be eaten whole or after scaling and gutting the fish.

Culinary uses

  • When buying local, fresh sardines look for bright eyes, shiny skin, firm to the touch and a fresh smell [11,13]
  • Good advice: never freeze fresh sardines!
  • Can be used in numerous delicious, easy dishes, such as ceviche, fish tacos, salsas, tomato sauces for pasta, smoked sardine pâté, and on pizza 
  • Simplicity is key! Some easy preparation ideas include [13,14]: marinate in salt, olive oil, & lemon juice; then grill, pan-sear, or broil, combine with onions, olives & fennel, top with chopped tomato, & rosemary, basil or oregano

Toxicity report

  • No known contaminants.

Nutritional information  

  • Fresh (3.5 oz) [10]
  • Promotes good cardiovascular health- rich in omega-3 fatty acids, vitamin B12, EPA, & DHA, which lower triglyceride & cholesterol levels, and reduce risk of atherioschlerosis [13,14] 
  • Promotes good bone health- rich in vitamin D, which aids uptake of calcium [13,14]
  • Is a great, inexpensive source of protein [13] 

Description of meat

  • Smaller sardines have a delicate flavor, while the larger ones have an fuller, oilier taste that is similar to (but milder than) anchovies [13].

Seasonal availability

  • Available fresh year-round [11,12] 

References

1. Protasio, C. 2011. Pacific sardine, Sardinops sagax. Status of the Fisheries Report 2011.  California Dept. Fish & Wildlife. http://www.dfg.ca.gov/marine/status/

2. Monterey Bay Aquarium, Seafood Watch – Pacific Sardine. www.montereybayaquarium.org/cr/cr_seafoodwatch

3. Cabrillo Marine Aquarium. 2013. Pacific Sardine. www.cabrillomarineaquarium.org/exhibits/socal-species-details.asp?id=21

4. Pacific Fishery Management Council. 2012. Coastal Pelagic Species: Current Season Management.

5. Hislop, K. 2013. Seafood Watch: Pacific Sardine Report. Rep. Monterey Bay Aquarium.

6. Protasio, C. 2011. Pacific Sardine. Status of the Fisheries 2011. California Dept of Fish & Wildlife. https://nrm.dfg.ca.gov/FileHandler.ashx?DocumentID=65547&inline=true

7. NOAA National Marine Fisheries Service. 2008 Status of the Fisheries. United States Department of Commerce.

8. NOAA, National Marine Fisheries Service. 2013. 2nd Quarter 2013 Update. United States Dept of Commerce.

9. Lindegren, M., et al. 2013. Climate, fishing & fluctuatinos of sardine and anchovy in the California Current. PNAS . http://www.pnas.org/content/early/2013/07/05/1305733110.full.pdf

10. Fat Secret: All things food and diet. 2013. Fresh sardines. www.fatsecret.com/Diary.aspx?pa=fjrd&rid=72915

11. Fish Watch. 2012. US Seafood Facts,  National Oceanographic and Atmospheric Administration www.fishwatch.gov/seafood_profiles/species/sardine/species_pages/pacific....

12. Protasio, Chelsea. 2011. Pacific Sardine, Sardinops sagax. Status of the Fisheries Report 2008. California Department of Fish and Wildlife. 28 July 2013. http://dfg.ca.gov/serp.html?q=pacific+sardine&cx=001779225245372747843%3....

13. The World’s Healthiest Foods. 2013. The George Matelijan Foundation.  <www.whfoods.com >

14. The Super Green List. 2013. Monterey Bay Aquarium Seafood Watch. www.montereybayaquarium.org/cr/cr_seafoodwatch/sfw_health.aspx>