Nghiên cứu đặc điểm phát triển mô học của tuyến sinh dục đực tôm rảo (<i>Metapenaeus ensis</i> de Haan, 1850) ở đầm phá Tam Giang-Cầu Hai, tỉnh Thừa Thiên Huế

Abstract

     The study was carried out on greasyback shrimp (Metapenaeus ensis de Haan, 1850) in Tam Giang-Cau Hai Lagoon, Thua Thien Hue Province from December 2013 to July 2014 with the aim of determining the histological structure of male gonad development after study, thereby providing data to improve the quantities and qualities of fingerlings, and improving efficiency of artificial breeding. The article presented some data on the morphological characteristics and histological structure of testicular development in greasyback shrimp in Tam Giang-Cau Hai Lagoon, Thua Thien Hue Province. Matured male greasyback shrimp has the male genital part, called Petasma. The largest recorded length of an adult male greasyback shrimp was 147.0 mm, the smallest recorded length was 108.0 mm, and the average length was 127.5 ± 2.5 mm. The largest recorded weight of an adult male greasyback shrimp was 25.0 g, the smallest recorded weight was 10.5 g, and the average weight was 17.75 g ± 1.3. Gonads of male greasyback shrimp consist of spermatogonium, primary spermatocyte, secondary spermatocyte, spermatid, and spermatozoa. Spermatogonium had large quantities; primary spermatocyte were the largest (12.3±0.5 μm), and ovoid in shape; the secondary spermatocyte (9.8±0.5 μm) were observed to have a smaller size compared to the primary spermatocyte, but larger than spermatogonium (11.7±0.5 μm), spermatid, and spermatozoa; spermatids were 4.5 ± 0.5 μm in diameter and had an oval shape; spermatozoas were 3.7±0.5 μm in diameter and the tail was 2.5 ± 0.3 μm in length but not movable. The spermatogenesis process happened continuously.

Keywords: Greasyback shrimp, histology, reproduction, Metapenaeus ensis, Tam Giang-Cau Hai.