fao_capture_groups(): 以捕捞为主（而非养殖）的物种类群

英文原页：fao_capture_groups()

说明

该函数计算每个水生动物ISSCAAP物种类群的捕捞产量占全球产量（捕捞和水产养殖）的比例：years期间的最低比例及其年份，以及第一年和最后一年的比例，并判断该类群是否算作以捕捞为主：在years的每一年中，捕捞至少占其全球产量的min_capture_pct%。catch_trade()只对这些类群比较贸易与渔获量，因为贸易统计无法区分产品来自捕捞还是养殖。

English

This function gives, for each ISSCAAP species group of aquatic animals, the share of capture in the world production (capture and aquaculture): the lowest share over years and its year, and the shares in the first and last year, and whether the group counts as mostly caught: capture made up at least min_capture_pct percent of its world production in every year of years. catch_trade() compares trade with catch only for these groups, because trade statistics do not tell whether a product was caught or farmed.

用法

fao_capture_groups(min_capture_pct = 90, years = NULL)

参数

min_capture_pct

类群计入所需的、每一年都要达到的最低捕捞占比（占全球产量的百分比）。默认为90。

English

The lowest share of capture (percent of world production) in every year for a group to count. Default is 90.

years

所用的年份。默认为NULL，即表中的全部年份（1976–2024年）。

English

The years. Default is NULL, all years of the table (1976 to 2024).

返回值

一个数据框，每个有产量的水生动物ISSCAAP类群一行：isscaap_code、isscaap_en、isscaap_zh，capture_pct_min和year_min（捕捞占比的最低值及其年份），capture_pct_first和capture_pct_last（第一年和最后一年的捕捞占比），以及counted（以捕捞为主的类群为TRUE），按类群代码排序。

English

A data frame with one row per ISSCAAP group of aquatic animals with production: isscaap_code, isscaap_en, isscaap_zh, capture_pct_min and year_min (the lowest share and its year), capture_pct_first and capture_pct_last (the shares in the first and last year), and counted (TRUE for the groups mostly caught), sorted by code.

详细说明

这些比例来自FAO全球产量数据（捕捞和水产养殖，活重吨）的2026.1.0版本，从1976年（贸易数据的第一年）起内置于本包中。FAO在其水生动物汇总表中不包括的类群（哺乳动物、鳄类、珍珠、珊瑚、海绵和水生植物）不计入。

按默认的90%和1976–2024年，计入的类群为鳕类、鲱和沙丁鱼类、金枪鱼类、其他中上层鱼类、其他底层鱼类、鲨鳐类、西鲱类、龙虾类、帝王蟹类、磷虾类、其他海洋甲壳类、鱿鱼和章鱼类，以及鲎类。过去以捕捞为主、如今部分或大部分来自养殖的类群不计入：虾类（从1986年起捕捞占比低于90%）、蟹类（从2000年起）、鲆鲽类（从2004年起）、其他沿岸鱼类（从2005年起）和鲑鳟类（捕捞占比1976年为81%，2024年为12%）。“Marine fishes not identified”（未鉴定的海洋鱼类）不计入，因为2022–2024年每年捕捞占其产量的比例都低于90%（89.65%–89.97%）。

English

The shares come from the FAO global production data (capture and aquaculture, tonnes live weight), release 2026.1.0, built into the package from 1976 (the first year of the trade data). The groups FAO leaves out of its summary tables of aquatic animals (mammals, crocodiles, pearls, corals, sponges and aquatic plants) are not counted.

With the default 90 percent and the years 1976 to 2024, the groups counted are the cods, herrings and sardines, tunas, miscellaneous pelagic and demersal fishes, sharks and rays, shads, lobsters, king crabs, krill, miscellaneous marine crustaceans, squids and octopuses, and horseshoe crabs. Groups once mostly caught but now partly or largely farmed are not counted: shrimps (capture below 90 percent from 1986), crabs (from 2000), flounders (from 2004), miscellaneous coastal fishes (from 2005) and salmons (81 percent caught in 1976, 12 percent in 2024). “Marine fishes not identified” is not counted because capture made up less than 90 percent of its production in each year from 2022 to 2024 (89.65 to 89.97 percent).

参考文献

FAO. Global production statistics (capture and aquaculture), release 2026.1.0. https://www.fao.org/fishery/static/Data/

示例

fao_capture_groups()
fao_capture_groups(years = 1976:1990)      # shrimps were then mostly caught
fao_capture_groups(min_capture_pct = 80)