Age Determination of Aquatic Animals

A special issue of Fishes (ISSN 2410-3888).

Deadline for manuscript submissions: closed (30 September 2025) | Viewed by 1326

Special Issue Editor


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Guest Editor
Adjunct Professor, Department of Biological Sciences, University of New Brunswick (Saint John), Saint John, NB E2L 4L5, Canada
Interests: age; growth; fisheries; fish; bivalves; crustacea

Special Issue Information

Dear Colleagues,

Understanding the age metrics of marine organisms is crucial in the estimation of baseline parameters such as growth rate, population age structure, mortality rate, productivity and recruitment.

The age of most aquatic species can often be determined by examining the growth bands preserved in calcified structures. These structures include, for example, bones, scales and otoliths in fish, statoliths in cephalopods, ossicles in echinoids (i.e., sea urchins), ophiuroids (i.e., brittle stars) and asteroids (sea stars), and shells in bivalves. In crustaceans, the number of growth bands in gastric ossicles may be used to determine the age of this group. Before applying the age information provided by these hard structures, validation (one band indicates one year of age) must be conducted.

Fishes invites interested scientists to submit manuscripts that are relevant to this topic. The manuscripts will be reviewed carefully in a short period of time so that all accepted papers can be published in this Special Issue.

Dr. Raouf W. Kilada
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

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Keywords

  • age
  • validation
  • growth
  • shells
  • cephalopod
  • echinoderms
  • crustaceans
  • fish

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Published Papers (1 paper)

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Research

27 pages, 10772 KB  
Article
Preliminary Assessment of Age and Growth of the Red Swamp Crayfish Procambarus clarkii [Girard, 1852] in the River Nile in Egypt by Direct and Indirect Methods
by Mohamed Saeed, Raouf Kilada, Sahar Mehanna, Abdelhalim Saad and Magdy Khalil
Fishes 2025, 10(9), 453; https://doi.org/10.3390/fishes10090453 - 5 Sep 2025
Viewed by 874
Abstract
The red swamp crayfish (Procambarus clarkii) is an exceptionally invasive species introduced into the Egyptian freshwater ecosystems in the 1980s for aquaculture purposes. Despite its ecological and economic significance, the age distribution of this species has not been assessed properly using [...] Read more.
The red swamp crayfish (Procambarus clarkii) is an exceptionally invasive species introduced into the Egyptian freshwater ecosystems in the 1980s for aquaculture purposes. Despite its ecological and economic significance, the age distribution of this species has not been assessed properly using an accurate method. This study is the first to validate the use of growth band counts in the mesocardiac ossicles as a direct technique for age determination in P. clarkii using 166 known-age individuals reared under various temperature regimes. The findings confirm that band counts represent age rather than number of molts. Field comparisons between northern (Giza) and southern (Aswan) Nile populations revealed maximum longevities of six and seven years, respectively, using direct methods, while indirect size–frequency analysis underestimated age at three years. Growth rates were higher at 25 °C compared to 32 °C, both in the lab and in situ. Males matured at larger sizes than females, though age at sexual maturity averaged one year in both regions. This study demonstrates the superiority of direct aging over traditional indirect aging methods, offering critical insights for managing crayfish populations and ensuring sustainable fisheries in the River Nile in Egypt. Full article
(This article belongs to the Special Issue Age Determination of Aquatic Animals)
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