Category: Lectures and Bites

Response to selection and selection intensity in fish

This single illustrated slide shows a normal distribution of a population and demonstrates the relationship between the response to selection and the selection differential that is directly related to selection intensity. The concerns about possible impact of small selected portion on inbreeding has been highlighted. [important]Response to selection and selection intensity[/important]

Permanent link to this article: https://fishconsult.org/?p=3523

Qualitative genetics in fish

This 2-slide bite defines the qualitative genetics in fish and its inheritence focusing on some examples in ornamental fish as well as in aquaculture as well as highlighting the nil influence of environment on the qualitative traits. [important]Qualitative genetics in fish[/important]

Permanent link to this article: https://fishconsult.org/?p=3516

Fish selection (trend and plateau)

This information bite illustrates the accumulated gain over generations through selection. The bite also describes the factors that influence the response to selection which are namely heritability coefficient and selection differential. The illustration shows the declining gain (response to selection) till reaching the plateau whereas no gain could be achieved unless variation is created naturally …

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Permanent link to this article: https://fishconsult.org/?p=3497

Genetic Environment Interaction (GxE) in Fish

This illustrated bite shows how the growth rate of two strains of a given species when grown in two different farming environments. The examples of the “No GxE) as well as the existence of the GxE has been illustrated. The two experimental environments are defined. The bite emphasized that these information should result of well designed experiment …

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Permanent link to this article: https://fishconsult.org/?p=3488

Longevity in Fishes

This large bite does not only address the definition of longevity and related terms (e.g. lifespan) but also covers with examples the factors affecting longevity. For a valid illustration, a Table with maximum longevity has been included whereas clear differences among various fish groups could be easily noticed. The application of longevity in fishery and aquaculture practices has …

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Permanent link to this article: https://fishconsult.org/?p=3431

Water transparency measurements using Secchi disk

This information bite handles a practical pond management issue as well as a field tool which is Secchi disk. The use of Secchi disk in measuring water transparency has been covered in the attached information providing adequate background such as sources of turbidity in water as well as factors to considered during measurement. Relating the …

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Permanent link to this article: https://fishconsult.org/?p=3404

Rigor mortis in fish and its relation to quality

This 4-slide information bite starts with an intoductory slide on the rigor mortis in animal in general including its causes and feautures. The remaining part of the bite focuses more on the rigor mortis in fish having in consideration the specific nature of fish as well as fishing and aquaculture practices. Emphasis has been placed on …

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Permanent link to this article: https://fishconsult.org/?p=2620

Possible use of plant compost in aquaculture

Credit of the photos:  Photos used in this information bite have been taken from a pool of photos which was given to me by friends who participated in Warm water fish production during 2009 and 2010. Identified names are: shared with me from El-Sadig Arbab Hagar (Sudan) and Lylian Wilfred Mguhi Lugobola (Tanzania). Thanks to …

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Permanent link to this article: https://fishconsult.org/?p=2598

Fish ovulation and egg overripe

This 2-slide information bite addresses the ovulation of fish female in regard to timing and indicators. Focus has been placed on the importance of collecting the spawn short time after ovulation before eggs turn overripe which means losing the chance for fertilization. The period from ovulation and eggs turn overripe vary according to some factors …

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Permanent link to this article: https://fishconsult.org/?p=2367

Enhancing fish hatchery practices – Extending solution (Ringer solution)

This single-slide information bite addresses facts related to fish sperm and its longivity. Enhancing the longivity as well as the fertilization of fish eggs is the focus of this bite. The composition and use of Ringer solution is covered in this breif. Also, the referigation of sperm solution. [important]Enhancing fish hatchery practices – Extending solutions[/important]

Permanent link to this article: https://fishconsult.org/?p=2355

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