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Grunto spalvos įtaką krevečių spalvai

Grunto spalvos įtaką krevečių spalvai

Mūsų ankstesniame dienoraščio įraše paminėjome įdomų karotinoidų ir krevečių spalvų intensyvumo santykio tyrimą, kuriame tyrėjai taip pat pastebėjo įdomią koreliaciją tarp fono (žvyro / dirvožemio) ir krevečių spalvos.

Red cherry krevetės buvo laikomos ant balto, raudono ir juodo grunto. Po 8 savaičių buvo gauti konkretūs rezultatai. Krevetės, kurios buvo vienodos spalvos, tapo labiau prisotintos spalvos ant raudono, o dar labiau - ant juodo grunto.

Bet kaip su šviesos intensyvumu, bangos ilgiu, spalvos profiliu? Ar tai keičia krevečių spalvą? Panašu, kad ne.

Tyrėjai testavo apšvietimo tvarkaraščius, 0 val. šviesos ir 24 val tamsos arba 12 val šviesos ir 12val tamsos.

Taip pat 7 apšvietimo tipus: Fluorescentinė lempa, baltas LED, raudonas LED, geltonas LED, žalias LED, mėlynas LED, violetinis LED.

Apšvietimo tvarkaraštis neturėjo jokios įtakos chromatoforams ir atyidae krevečių pigmentacijai, taip pat kaip ir skirtingi šviesos šaltiniai.

Tačiau tame pačiame tyrime tyrėjai patvirtino pigmentacijos intensyvumo priklausomybę nuo grunto spalvos.

Grunto spalva tiesiogiai įtakoja astaksantino distribuciją per kelias valandas po krevečių perkėlimo iš balto į tamsų.

Po egzoskeleto patikrinimo paaiškėjo, kad pigmentas buvo tolygiau koncentruotas chromatoforuose intensyvesnės spalvos krevetėse.

 

Čia pateiktas mikroskopinis epidermio sluoksnio tyrimas iš pirmo segmento (tigrinė krevetė, Penaeus monodon). Chromatoforos skirtingu  laiku (baltas į juoda: a - 0val, c - 3val, e – 7 dienos ir iš juodo į balta b- 0val, d- 3val, f-7 dienos)

Krevetėms įprasta ir natūralu prisitaikyti prie aplinkos ir maskuotis, taip užtikrinant savo saugumą. Kadangi selekcija atrinktos krevetės buvo skirtingų spalvų linijų, tai šis natūralus maskavimas labai akivaizdus.

References:

The Effects of Background Lightness and Hue and Illumination period and wavelength on Presentation of Chromatophores of Atydae Shrimp (Neocaridina denticulata) Nian-Zu LiItem 987654321/30138

Effect of background color on shrimp pigmentation

Jane PARISENTI,  Luiz Henrique BEIRÃO, José Luiz MOURIÑO, Felipe do Nascimento

VIEIRA, Celso Carlos BUGLIONE, Marcelo MARASCHIM

Effect of Dietary Astaxanthin and Background Color on Pigmentation and Growth of Red Cherry Shrimp, Neocaridina heteropoda Nongnuch Laohavisuti and Uscharee Ruangdej

Effect of background colour on the distribution of astaxanthin in black tiger prawn (Penaeus monodon) R.K. Tume a,b , , A.L. Sikes a,b , S. Tabrett a,c , D.M. Smith a,c

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