think.fish blog

  • Around 250 billion animals killed per year, many of which as appetisers

    * Based on data from [1] and Shujie Chen et al., IFFO, Björn Kok et al., and A. G. J. Tacon et al.

    Annual global shrimp production was 5.6 million tonnes in 2023 and is estimated to reach 5.7 million tonnes in 2024 [1]. Assuming an average live weight per shrimp of 20 grams [2], this means that around 250,000,000,000 shrimp were killed last year. That’s about twice as many as the number of fish farmed each year!

    Why is mankind farming one of the smallest of all farmed animals, and in exorbitant quantities? Wouldn’t it be wiser, if at all, to farm large aquatic animals such as the Arapaima, a Brazilian freshwater fish? This would at least significantly reduce the number of animals suffering.

    Amazingly, Ecuador is the leading shrimp-producing country, with an area similar to that of the United Kingdom, but only 18 million inhabitants, half of whom live in the coastal region, where one in five workers is employed in the shrimp industry. 25 per cent of the world’s shrimps by weight come from this Latin American country, while China and India, 37 and 13 times larger than Ecuador respectively, each with almost 80 times the population, follow in second and third place only. In addition, more than half of the world’s shrimp weight is produced in Asia, the world’s leading region for aquaculture in general.


    Reference and footnote:

    [1] https://www.facebook.com/photo?fbid=28830292729891376&set=a.762088143805211

    [2] varies from species to species and depends on age at harvest

  • Welchen Fisch essen? Am besten weniger!

    Welchen Fisch essen? Am besten weniger!

    Der in der NZZ am 18. Januar 2025 publizierte «Leitfaden für einen nachhaltigen Fischkonsum» [1] enthält ein paar Informationen, die bewusst Konsumierende leicht in die Irre führen könnten. Ich erlaube mir daher ein paar Hinweise.

    (mehr …)
  • Science snippets

    Science snippets

    #1: Your ear, like the ears of all mammals, has its origin in the gills of ancient fishes
    More…

    #2: Ancient molluscs were more complex and adaptable than previously assumed, as a study of discovered fossils shows.
    More…

    #3: You may think that your skeleton is rigid, but the cells in your bones are constantly being destroyed and rebuilt. You have inherited this fascinating ability from a very old fish, the Astraspis, which lived 460 million years ago.
    More…

    #4: The Bigmouth buffalo, a carp-like species that lives in North American lakes, can grow to be over 100 cm long and 100 years old. Studies show that ageing does not affect the fitness of this species. However, researchers are also wondering why they hardly find any younger specimens and fear that the species could become extinct.
    More…

    #5: Despite all conservation efforts, shark populations in the Mediterranean are still declining.
    More…

    #6: Microplastics in the sea are a problem that you touch with your tongue and intestines when you eat seafood, a new study shows.
    More…

  • Licht und Lärm schaden den Fischen

    Licht und Lärm schaden den Fischen

    Nicht nur die stete Erwärmung der Erde und gefährdet das aquatische Leben. Auch andere direkte Auswirkungen des zunehmenden Schiffsverkehrs, des Tourismus und weiterer industrieller Nutzungen machen den Wassertieren das Leben immer schwerer.

    Die Verschmutzung der Gewässer durch Licht und Lärm schadet den Fischen. Das machen Studien an Korallenfischen vor der Insel Moorea in Französisch-Polynesien deutlich.

    Stete künstliche Beleuchtung während der Nacht beeinträchtigt die Nachkommen der Fische und gefährdet damit langfristig den Bestand der betroffenen Arten. Zudem können beleuchtete Korallen eine höhere Anziehung auf bestimmte Fischarten ausüben, die sich dadurch in einem für ihre Art weniger günstigen Umfeld aufhalten.

    Steter Lärm von Motorbooten und Jetskis verändert den Hormonhaushalt und das Verhalten der untersuchten Fischarten. Anemonenfische verlassen ihren Schutz zwischen den Seeanemonen seltener und fressen daher weniger; die Männchen werden zudem aggressiver. Ähnliches beobachteten australische Forscher bei Stachelmakrelen, die ihre Eier in Korallenriffen ablegen und bewachen; Lärm beeinträchtigt nicht nur die elterliche Pflege, sondern auch die Entwicklung des Dottersacks der Larven.


    Titelfoto:
    Rotmeer-Anemonenfisch (Amphiprion bicinctus) in einer Lederanemone (Heteractis crispa) (Foto: NOOA / Wikimedia Commons)

    Quelle:
    «Auch Korallenfische bevorzugen Ruhe»

  • Ceterum censeo: Zuchtlachs meiden!

    Gut gemachte, klare Sendung [1] von «Kassensturz», dank einem prima vorbereiteten Journalisten (Philipp Ruch) sowie Yannick Rohrer von fair-fish und Iris Menn von Greenpeace.

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  • Zum Nachdenken und Weitergeben

    Max. 1x pro Monat Fisch auf den Tisch – mehr dazu hier.

  • Whale and Shark whale news

    Whale and Shark whale news

    #1: Long-distance swimming whale

    We know so little about life in the oceans. We find that a Humpback whale (Megaptera novaeangliae) did travel from the west coast of Latin America to the east coast of Africa, i.e. more than 13,000 kilometer, an extraoridnary long migration for an individual of this species, scientists say and puzzle over what could have caused this whale to go that far — mental confusion? desperately looking for a mating partner? However, we should also envisage that this individual behaviour is not so exceptional. The long-distance swimmer has been detected thanks to a new fluke recognition software, so, more long-distant travelling conspecifics could be detected in future.
    More…

    #2 Whale sharks (and not only them) threatened by deep-sea mining

    We know so little about life in the deep sea and what will happen when the industry starts digging there. Just one example: The Sea of Cortez between the Baja California peninsula and the Mexican mainland is one of the few hotspots for whale sharks known to migrate in the Pacific and also dive in the zone around Clarion-Clipperton Island, a key area for deep-sea mining in the Pacific. Whatever happens there will have its consequences in the Sea of Cortez, 2000 kilometres to the north, where global warming is threatening marine life and posing challenges not only to the whale sharks but also to local fishermen and people who live from tourism. This is one example of why the organisation ‘The Ocean and Us’ has launched its petition ‚to call on all governments to take a firm position against deep-sea mining‘.
    More…

  • Industry news

    Industry news

    #1 Wild catch volumes recover, markets stagnate

    An outlook [1] from the UN Food and Agriculture Organisation (FAO) for 2024 predicts a slight increase in fisheries yields of 1.1%, while aquaculture is expected to grow by 3.1%, supported by a downward trend in fish meal and fish oil prices. On the other hand, the value of global trade in fish and seafood is expected to fall by 1.2%, although the volume will continue to increase by an estimated 1.0%.

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  • Fish welfare: what should we aim for?

    Graph by the author, based on the fair-fish database

    Resources are, as always, limited. Should we then invest in improving some details in the lives of over 500 farmed aquatic animal species, most of which are known not being able to experience welfare in captivity anyway? Or should we rather focus on the few species that possibly may thrive under improved farming conditions?

    (mehr …)

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