Transparent ndiwo mazai ehove dzemabhonzo uye akawanda akatenderera. Iko kune inoyerera yekunze membrane ine madiki pores, anonzi chorion. Iyi membrane inowanzo nyorova, kunyangwe mune mamwe marudzi ine hexagonal lattice.
El yolk kubva muzai ndiye anotarisira kupa iyo simba uye zviwanikwa zvekudya izvo embryo inoda panguva yekukura kwayo kusvikira yava kukwanisa kuzvipa pachayo, iyo inenge yatova chikamu che plankton. Mune dzimwe mhando de peces, yolk inotora nzvimbo yese iripo uye inosiya chete nzvimbo yekumucheto yakasununguka.
En elasmobranchs, kana vachinge vawana urume ovules, yakafukidzwa necnene capsule ine zviyero zvakasiyana uye hukuru zvichienderana nemhando. Mune mamwe oviparous shark, semuenzaniso, ino kapuleti ine yakawedzera kana kushoma rectangular chitarisiko, uye inopihwa nemafuta kuti igadzire pazasi.
Kana iri saizi yemazai, inosiyana zvakanyanya, kunyangwe iwo ari angangoita 1 mm muhupamhi, uye anogona kusiyanisa pakati pe0,25 kusvika 7 mm mune akasiyana marudzi. Iyo saizi rakaringana Iyo ndiyo inowedzera huwandu hwemazai uye kupona kweramangwana kwemaruva nevechidiki.
ari benthic mazai iwo ari, kazhinji, akakura kupfuura eplanktonic, ane yakawanda yolk uye mashoma mashoma. Kukura kwe "embryo" mukati mezai kwakareba, uye iro gonhi rinobuda mune yepamberi mamiriro, rine maziso ane mavara.
Mukudzoka fecundity mu pelagic inobereka hove iri pamusoro pane yeavo vanoisa mazai benthic. Iko kune ipapo hukama hwakajeka pakati pehukuru hwezai nekupona kwemaruva. Uye chokwadi ndechekuti maruva makuru kwazvo anokwanisa kudya huwandu hwakawanda hwehukuru uye hukuru, uye panguva imwe chete, havatapuriki kune zvikara.