Cavefish Surface Fish
Cavefish Surface Fish - Related Videos
07:25
Basic Methods for the Study of Reproductive Ecology of Fish in Aquaria
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Cited by 2 •
2017
A series of basic methods to enable the study of the reproductive ecology of fish kept in aquaria are described. These are useful protocols for collecting fish using SCUBA, transporting live fish, and observing the reproductive behavior of wild-caught fish kept in aquaria.
02:32
Osmoregulation in Fishes
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2019
When cells are placed in a hypotonic (low-salt) fluid, they can swell and burst. Meanwhile, cells in a hypertonic solution—with a higher salt concentration—can shrivel and die. How do fish cells avoid these gruesome fates in hypotonic freshwater or hypertonic seawater environments? Fish employ osmoregulatory strategies to balance bodily levels of water and dissolved ions (i.e., solutes), such as sodium and chloride. Imagine two solutions separated by a membrane that is permeable to water.
03:30
Morpholino Mediated Gene Editing: A Gene Knockdown Technique Using Translational Blocking Morpholino Oligonucleotides in Single-Celled Cavefish Eggs
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2025
This video describes a gene knockdown technique using translational blocking morpholinos microinjected in the one-cell stage of the cavefish. Morpholinos are DNA oligonucleotides that bind to the complementary sequence of target mRNA and block its translation to a protein. Consequently, morpholinos are used as molecular tools to stop or reduce a gene’s expression transiently.
07:01
Manipulation of Gene Function in Mexican Cavefish
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Cited by 42 •
2019
We describe approaches for the manipulation of genes in the evolutionary model system Astyanax mexicanus. Three different techniques are described: Tol2-mediated transgenesis, targeted manipulation of the genome using CRISPR/Cas9, and knockdown of expression using morpholinos. These tools should facilitate the direct investigation of genes underlying the variation between surface- and cave-dwelling forms.
05:12
Swimming Performance Assessment in Fishes
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Cited by 56 •
2011
The lives of the majority of fish are predicated on swimming. This protocol describes techniques for capturing a range of swimming modes available to individual and schooling fish, and includes metrics associated with swimming physiology and behaviour.
FAQs
Heritable genetic variation provides the biological differences that selection can act on, while developmental regulation determines when and how those differences appear during embryonic development. In cavefish, this framework helps explain altered eye development and other traits as coordinated outcomes rather than isolated changes within a changing environment.
Persistent darkness and limited food create environmental conditions that favor different developmental and physiological strategies from those suited to sunlit habitats. In the Mexican tetra, these pressures are associated with changes in eyes, pigmentation, metabolism, sensory systems, and behavior, allowing biologists to study how multiple traits respond to ecological conditions.
Comparing the two forms helps separate environmentally associated differences from broader biological patterns and connects observable traits with underlying genes. The system is also useful for investigating convergent evolution, in which similar environmental challenges may be associated with comparable evolutionary changes, providing context for how adaptation can shape development and behavior.
Researchers use the contrasting forms as a natural comparison for examining relationships between genetic variation, developmental regulation, and visible or measurable traits. Eye development, pigmentation, metabolism, sensory systems, and behavior offer distinct targets for linking biological changes to environmental history, helping clarify how genes contribute to complex characteristics.
The model supports research on sleep, feeding, and tissue repair in addition to developmental and evolutionary questions. Studying these processes across cave and surface forms can show how contrasting environmental histories are associated with differences in biological function, extending the model beyond anatomy to behavior, physiology, and recovery-related traits.
Cavefish and surface fish provide an evolutionary comparison for examining how developmental regulation produces different traits under contrasting environmental conditions. Findings from this system can contribute to broader research on human developmental disorders by clarifying relationships among genes, development, and phenotype, while retaining the wider context of adaptation and evolution.