Đa dạng hình thái theo giới tính của cá ba kỳ đỏ (Cyclocheilichthys apogon)

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Tác giả: Thúy Yên Dương, Thị Ngọc Trân Nguyễn, Thị Vân Phụng Trần

Ngôn ngữ: Vie

Ký hiệu phân loại: 639 Hunting, fishing, conservation, related technologies

Thông tin xuất bản: Tạp chí Khoa học Đại học Cần Thơ, 2021

Mô tả vật lý: 163-169

Bộ sưu tập: Metadata

ID: 397753

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Tóm tắt
Chủ đề

Nghiên cứu này nhằm tìm hiểu những điểm giống và khác nhau về đặc điểm sinh trưởng và hình thái của cá ba kỳ đỏ (Cyclocheilichthys apogon) theo giới tính. Mẫu cá được thu (n=244) ở kênh bao quanh U Minh Thượng - Kiên Giang, từ tháng 7/2019 đến tháng 3/2020. Mối quan hệ chiều dài-khối lượng và đặc điểm hình thái gồm chỉ tiêu đếm (số lượng tia, gai ở vi) và chỉ tiêu sinh trắc (tỉ lệ số đo phần thân và đầu trên chiều dài chuẩn và chiều dài đầu) được phân tích. Cá cái có kích cỡ lớn hơn cá đực (P<
0,01). Hệ số sinh trưởng (b) của mối quan hệ chiều dài-khối lượng (W=aLb) có xu hướng ≥ 3 ở cá cái và ≤ 3 ở con đực. Các chỉ tiêu đếm, hình dạng cơ thể và màu sắc bên ngoài giống nhau giữa hai giới. Tuy nhiên, đa số các chỉ tiêu sinh trắc (15/20 chỉ tiêu) khác biệt có ý nghĩa giữa cá đực và cá cái (P<
0,05 hoặc P<
0,01), trong đó khác biệt rõ nhất ở phần đầu và cao thân. Cá cái có tỉ lệ cao thân lớn hơn, đầu ngắn hơn nhưng rộng và cao hơn cá đực. Ngược lại, cá đực có chiều dài tia vi lưng và dài gốc vi hậu môn lớn hơn cá cái. Những điểm khác biệt trên có thể liên quan đến đặc điểm sinh sản và di chuyển của hai giới tính., Tóm tắt tiếng anh, This study was aimed to identify similarities and differences in growth and morphological characteristics of beardless barb (Cyclocheilichthys apogon) between two sexes. Fish samples (n=244) were collected in canals surrounding U Minh Thuong, Kien Giang province from July 2019 to March 2020. Length-weight relationship (LWR) and morphological characteristics including countable traits (number of fin spines and rays) and morphometric indices (ratios of body and head measurements to standard length and head length) were analyzed. Females have larger sizes than males (P<
0.01). The growth coefficient (b) of LWR (W=aLb) has a trend of ≥ 3 in females and ≤ 3 in males. Countable traits, body shape and color are similar between females and males. However, 15 out of 20 morphometric indices are different between two sexes (P<
0.05 or P<
0.01), in which obvious differences are in head morphology and body depth. Females have higher body depth, and shorter but wider and deeper head. In contrast, males have larger dorsal fin length and anal fin base. Above differences between females and males can be related to spawning and movement behaviors of Cyclocheilichthys apogon.

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