- Early: The larval or juvenile life stage that is early or at the beginning of the life or growth stage.
- Egg (Fertilized): The union of male (sperm) and female (egg) gamete cells (i.e., the mature sexual reproductive cells) to form a zygote, also called a fertilized egg.
- Egg (Unfertilized): The female (egg) gamete cells that have not been fertilized by male gamete cells (or sperm).
- Juvenile: Growth stage of a fish before it becomes an adult. The juvenile stage starts when the larva develops the characteristics of a juvenile fish, which include the presence of all fin rays and scale growth is in process. The stage completes when the juvenile becomes sexually mature or starts interacting with other adults.
- Larval: Growth stage of a fish before it becomes a juvenile. The larval stage is a transitional stage where the yolk-sac larval stage lasts from hatching through the absorption of the yolk-sac.
- Late: The larval or juvenile life stage that is late or at the end of the life or growth stage.
- Live: Life stage of a fish exhibits normal development. Eggs display normal embryological development with intact oil globules and perivitalline space. Larvae are opaque, have a distinct body outline, full yolk-sacs (if a yolk-sac larvae) and well-defined myomeres. Juveniles have a distinct body outline, well-defined myomeres, and are motile.
- Long Dead Larvae: Considered to be natural mortality prior to entrainment and characterized the following: a) non-motile, opaque, b) fins or fin buds not definable, c) myomeres not definable, d) gut absent, and e) body tissue or outline not well defined.
- Moribund: Dying or close to death fish eggs and larvae.
- Myomeres: Blocks of skeletal muscle tissue divided vertically along the body length into sections that are separated by sheets of connective tissue. The myomeres are commonly shaped like a "W" or "V" so that they fit into one another like a series of cones. Myomere counts are sometimes used for identifying specimens, since their number corresponds to the number of vertebrae in the adults.
- Oil Globules: Physical feature in the yolk of a fish egg or larva that provides energy and nutrition to meet metabolic requirements.
- Old: Unfertilized egg life stage that is old or at the end of this stage.
- Opaque: Blocking the passage of light (or not transparent). Indicates organism is “long dead”
- Post-eyed: Fertilized egg life stage that follows eye development.
- Pre-eyed: Fertilized egg life stage that is before eye development.
- Recent: Unfertilized egg life stage that is recent or at the beginning of this stage.
- Recently Dead Larvae: Considered to represent those larvae damaged during sample collection (and/or recent natural mortality) and characterized the following: a) non-motile, b) body transparent or translucent, c) gut defined, d) myomeres well defined, e) fins or fin buds well defined and, f) body tissue or outline well defined.
- Translucent: Allowing light to pass through partially or diffusely. Indicates organism is “recently dead”.
- Transparent: Allowing light to pass through so that objects behind can be clearly seen. Indicates organism is “live”
- Yolk-sac: A membranous sac attached to an embryo or larva, providing early nourishment in the form of yolk in bony fishes. The characteristics of the yolk-sac stage of larvae includes body size and shape, gut shape and length, pigment patterns, size and shape of yolk sac, oil globule size and position, and presence or absence of specialized larval characters such as elongate fin rays, enlarged finfolds, and stalked eyes.
To explore the contents of the ENTRAIN database, follow these steps:
- Select the species of interest by clicking on the drop-down box next to the "Common Name" header.
- Select the location of interest by clicking on the drop-down box next to the "Location" header.
- To access information on a specific life stage and condition, click on the applicable photo (e.g., Larval and Early).
- Use the image viewer page to explore full-size photos and view metadata for the selected stage and condition.
Additional resources related to ENTRAIN can be accessed via the navigation links at the top of the page, including:
- Home - click this navigation link to read background concerning the ENTRAIN tool.
- Species - click this navigation link to view a list of species included in the current version of ENTRAIN.
- Methods - click this navigation link for a description of the methods and equipment used to develop the database.
- References - click this navigation link to view a list of references for the database.
- Submit - click this navigation link to view a form for submitting information regarding condition photos you can contribute to the database.
- Contact - click this navigation link to view contact information for this tool.