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When the quality of water for concrete preparation is uncertain, its impact on the setting time of cement and compressive strength of mortar is assessed by comparison with de-ionized or distilled water benchmarks. American Society for Testing and Materials (ASTM) C1602 requires the setting times to be within 90 minutes of the control, British Standard (BS) 3146:1980 allows a 30-minute variance in the initial setting, while British Standards European Norm (BS EN) 1008 specifies initial setting...
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Updated: Feb 4, 2026

Automated Gel Size Selection to Improve the Quality of Next-generation Sequencing Libraries Prepared from Environmental Water Samples
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Sequential codend improves quality of trawl-caught cod.

Jesse Brinkhof1, Stein H Olsen2, Ólafur A Ingólfsson3

  • 1Norwegian College of Fishery and Aquatic Science, University of Tromsø, Tromsø, Norway.

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This study introduces a dual sequential codend to improve trawl-caught fish quality. The new design significantly reduces fish damage, increasing the probability of undamaged cod by five times compared to conventional methods.

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Area of Science:

  • Marine Biology
  • Fisheries Science
  • Aquaculture Engineering

Background:

  • Trawl fishing often results in diminished fish quality due to physical damage.
  • Minimizing catch damage is crucial for improving the market value and sustainability of fisheries.

Purpose of the Study:

  • To introduce and evaluate a novel dual sequential codend system.
  • To assess the effectiveness of this system in reducing physical damage to trawl-caught fish, specifically cod (Gadus morhua L.).

Main Methods:

  • A dual sequential codend was designed with two segments: an anterior segment with a standard mesh size and a posterior segment with a delayed opening mechanism.
  • Fish were retained in the anterior segment during towing, with the posterior segment opening during haul-back.
  • The quality of cod caught using the dual sequential codend was compared to that from a conventional codend.

Main Results:

  • The dual sequential codend significantly reduced the frequency and severity of catch damage in cod.
  • Cod caught in conventional codends had only a 3.6% probability of being undamaged.
  • The probability of catching undamaged cod was five times higher with the dual sequential codend, with reduced instances of gear marks, poor exsanguination, ecchymosis, and skin abrasions.

Conclusions:

  • The dual sequential codend is an effective innovation for improving the quality of trawl-caught fish.
  • This technology offers a viable solution to mitigate physical damage, thereby enhancing fish marketability and potentially reducing post-capture losses.