Question

In a key about fish, the species are identified by the length of their bodies and by their body mass. Is this key reliable?

Answer 1

Answer:

A fish body condition index was calculated twice for each individual fish, including or excluding parasite mass from fish body mass, and index values were compared to test the effects of parasite mass on measurement of body condition. Potential correlations between parasite load and the two alternative fish condition index values were tested to assess how parasite mass may influence the perception of the actual effects of parasitism on fish body condition. Helminth parasite mass was estimated in common bully Gobiomorphus cotidianus from four New Zealand lakes and used to assess the biasing effects of parasite mass on body condition indices. Results showed that the inclusion or exclusion of parasite mass from fish body mass in index calculations significantly influenced correlation patterns between parasite load and fish body condition indices. When parasite mass was included, there was a positive correlation between parasite load and fish body condition, seemingly indicating that fish in better condition supported higher parasite loads. When parasite mass was excluded, there was no correlation between parasite load and fish body condition, i.e. there was no detectable effect of helminth parasites on fish condition or fish condition on parasite load. Fish body condition tended to be overestimated when parasite mass was not accounted for; results showed a positive correlation between relative parasite mass and the degree to which individual fish condition was overestimated. Regardless of the actual effects of helminth parasites on fish condition, parasite mass contained within a fish should be taken into account when estimating fish condition. Parasite tissues are not host tissues and should not be included in fish mass when calculating a body condition index, especially when looking at potential effects of helminth infections on fish condition.

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Answer 2

Yes this key reliable  about fishes the species are identified by the length of their bodies and their mass.

Step by step explanation

• Every  fish body index is measured with respect to their habitual and twice, including  its  parasite mass from fish body mass, and their index values are  compared to measuring the impact of parasite mass on body condition of their measurement.
• Potential similarities between the parasite load and the two alternative fish condition index levels were tested to examine how parasite mass can impact  on the interpretation of the actual effects of parasitism on the condition of the fish body.

• Parasite tissues are not host tissues, and  they were not included in fish mass when determining an index of body condition, especially when considering potential effects of pathogen infections and other bacterial infectious etc.. on fish condition.
• Fish body condition proved to be overestimated if parasite mass was not accounted for a result it  showed a positive correlation between relative parasite mass and degree of overestimation of individual fish condition.
• When parasite mass was omitted, then there was no correlation between parasite load and condition of the fish body.when state of the fish marine corps appeared to be overestimated if parasite mass was not accounted .
• . There are no  detectable effect of helminth parasites on fish condition and the fish condition on parasite load.

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